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USER`S MANUAL ALLSTAR DGPS BASE STATION P/N 220

1. THIS DRAWING 15 THE PROPERTY OF CANADIAN MARCONI COMPANY AND MAY BE NEITHER USED REVISION STATUS OF SHEETS REVISIONS COPIED REPRODUCED OR OTHERWISE DEALT WITH NOR ITS CONTENTS COMMUNICATED TO OTHERS 6 6 C EXCEPT IN ACCORDANCE WITH WRITTEN INSTRUCTIONS RECEIVED FROM CANADIAN MARCONI COMPANY SHEET 112 134 56 OZONE REV DESCRIPTION DATE APPROVED REV NOTES ALL WIRES TO BE 22 AWG UNLESS OTHERWISED SPECIFIED 2 BAND MARKER TO BE WHITE P B 25 MALE 8 FT M E INPUT b P2 12V INPUT B LIGHTER PLUG en Le wtb asc cm EN 8 FT 211 50129 00 5 ue i p MB n inir MAIN IN OUT J PORT MAIN IN OUT STARBOX CABLE B 9 FEMALE ei 5 E ee J2 PORT 2 DGPS IN Uo JesPORT 2 DGPS IN OUT PORT 2 GUIDANCE OUT pud 9 FEMALE HB 222 sib OX ee 1 CURE ST CU STINE WARK 8 DISC IN OUT J3 eae 9 A SCHEMATIC DIAGRAM E P POWER P1 25 20 AWG 52 DI 20 AWG 13 RX eT fag TXI 6 1 21 TABLE G PI 8 1 5 INCLUDED CONNECTORS rper mm PART NO P2 JI J2 J3 4 211 601729 0 Tx2 P1 20 2 2 J2 211 601 729 000 X X 6 19 2 5 211 601729 001 X X X 217 601729 002 X
2. EVISIONS 1O ZONE RE V APPROVED PRODUCT BASE 98 01 20 D C m 1 BAG IDENTIFICATION ONLY NO MARKING ON CABLE REQUIRED D VARIATION NO DENO 217 601727 0 XX LENGTH OF 0 BULKHO FEMA pa 2 t TNC BULKHD FEMALI i 1 C 5 BNC BULKHD FEMA i 1 e 6 BNC BULKHD FEMA B LIST OF PARTS TEM NO NOMENCLATURE PART 017 CONNECTOR COAX MICROAX RIGHT ANG SUHNER 16 MR 2 CONNECTOR COAX BNC V 2 CONNECTOR COAX TNC MR 3 CABLE COAX AG3I6 U N A XX CM 3 E COAX RGI74 U WA THIRD ANGLE E WATERTAL CANADIAN MARCONI COMPANY A e MONTREAL QUEBEC CANADA CABLE RF MICRO GPS FINISH AGE NS 17 90073 7 601727 SCALE 1 1 I SHEET GENERATED ON CONEY Page D 11 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page D 12 Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX E SUPPORTED DATUM LIST CONTENTS Subject Page DATUM DESCRIPTION TABLE 5 or orc dide E 1 ELLIPSOID DESCRIPTION TABLE 4 Page E i April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page E ii Revision A Sept 2000 cme elec DATUM DESCRIPTION T
3. 4 1 BXOPERATIONAE STATES Lis iesus ism ctt teet le Ss uestis ostii ge 4 1 CODATUM SUPPORT eec cte iS cti edi se cse ror s LE P e 4 4 POWER UP INFORMATION eere nnne th tne tn trina tatnen th 4 4 AcBOOTANEORMATIDN a n ant ctas cn duc atat ad 4 4 B OPERATIONAL INFORMATION xcs pes tetas ct Wh teet c 4 5 CONFIGURABLE PARAMETERG s sssesessssessecessesseseceecseeesecsecsesesessevsecesessevseseseesensaveesnsesseveesesensanensesenees 4 5 A 5 Uer LA cae 4 5 B MASKOANGLEE ir eee cts SR Sealy ated 4 7 GoGPS ANTENNA POSITIONS Atenas eee i en ria ctu ro Aun ES 4 7 DATA REQUESTB ee AE EEE E SS AE 4 7 Page 4 i April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page 4 ii Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION IV OPERATION RECEIVER STATES A NON OPERATIONAL STATES The receiver has two non operating modes OFF mode and SRAM Keep Alive mode The maintenan
4. 11 D 1 CABLE SELECTION irte ree D 1 GEODETIC ACTIVE D 3 ACTIVE ANTENNA eee itenim e ioter Pos tete tione idee deorum D 4 PASSIVE ANTENNA iiie ie cec etse eode RP D 4 SUPPORTED DATUM LIST ernst nn sinn antris tnis sna snn asina nnns E 1 DATUM DESCRIPTION tnter ntn inns stria tnra snas E 1 ELLIPSOID DESCRIPTION TABLE eere eene nsn E 4 SOFTWARE REPROGRAMMING MODBDE cerent nennen nnn nns F 1 EET F 1 PROGRAMMING MODE PROCEDURE eene enne natn nnn nnns F 1 HOW TO VERIFY IF IN PROGRAMMING MODE OR eee F 2 WHICH PORT USE ren use Sender Rasa dee aire deese F 2 PROGRAMMING UTILITY 111111111 tn sn nnns nnns ennenen nenene inen F 2 PROG EXE PARAMETERS 5 erre rettet tette ettet nutre era e Den eee E Sere F 3 PROGRAMMING UTILITY ALGORITHM eene F 4 Page TC iv April 17 2000 FIGURE NO
5. A 4 TIME 5555 m a aee IWON TA GS 4 SOFTWARE UPGRADE 4 GPS MONITOR SOFTWARE 5 4 410 100 7 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page A ii Revision Sept 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX A RECEIVER DEVELOPMENT KIT OVERVIEW The Receiver Development Kit allows new users to easily evaluate the GPS receiver The Development Kit implements the receiver control operation and I O functions of the receiver using an IBM compatible personal computer a serial port an external geodetic GPS antenna and an cable with a 115 VAC to 12 VDC power adapter The GPS receiver is contained in a plastic extrusion unit with I O connectors and status LEDs GPS Monitor is an MS Windows application running on a PC that allows communication with the receiver All commands and data requests can be sent through this application and all received data is decoded and displayed in specific windows A data logging facility is also provided within this tool Details on the use of GPS Monitor is provided in the GPS Monitor User s
6. 19 European 1950 International 117 132 164 lran 20 1950 International 97 88 135 ltaly Sicily 21 European 1979 International 86 98 119 Austria Findland Netherlands Norway Spain Sweden Switzerland 22 Geodetic Datum 1949 International 84 22 209 Zealand 23 Hjorsey 1955 International 73 46 86 Iceland 1 April 17 2000 cme electrenics USER S MANUAL ALLSTAR DGPS BASE STATION NAME ELLIPSE 24 Hong Kong 1963 International px DY Dz COUNTRIES 156 271 189 Hong Kong 25 Hu Tzu Shan International 26 Indian 1954 Everest 1830 637 549 203 218 816 297 Vietnam 27 Ireland 1965 28 Kertau 1948 Everest 1948 Airy modified 506 122 611 Ireland 11 851 5 West Malaysia amp Singapore 29 1964 Clarke 1880 90 40 88 Liberia 30 Luzon Clarke 1866 133 77 51 Philippines Excluding Mindanao 31 Massawa Bessel 1 841 32 Merchich Clarke 1880 639 405 60 Ethiopia Eritrea 31 146 47 Morocco 33 Minna Clarke 1880 34 Nahrwan Clarke 1880 92 93 122 247 148 369 Masirah Island 5 35 North American 1927 Clarke_1866 135 172 Alaska 36 North American 1927 Clarke 1866 3 142 183 Antigua Barbados Bermuda Caicos Islands Cuba Dominican Republic Grand Cayman Jamaica Turks I
7. 3 5 Page 3 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page 3 ii Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION Ill INSTALLATION AND VERIFICATION This section covers the installation and verification of the receiver Sold separately the StarView Graphical User Interface running on a PC allows the user to control the receiver and to display its outputs Details on StarView are provided in Ref 5 EQUIPMENT REQUIRED Refer to Figure A 1 in Appendix A for a description of the equipment required for the receiver to operate ELECTROSTATIC DISCHARGE WARINESS Refer to the electrostatic discharge notice in the preliminary pages of this manual EQUIPMENT INTERCONNECTION As aforementioned the receiver can be provided either as an OEM board within a STARBOX unit or within a Development Kit The interconnection of the OEM board format is guided by its physical and electrical specifications detailed in the previous section A complete description of the Development Kit is provided in Appendix A and a complete description of the STARBOX is provided in Appendix B The receiver includes two serial communication ports COM1 and COM2 Serial communication with the receiver must be performed COM1 The I O protocol is discussed a subsequent section The minimal baud rate is 19200 The other
8. 1 Date April 15 1998 Sheet 1 of DEVELOPMENT KIT SCHEMATIC Page A 5 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SEE THIRD UART DESCRIPTION vcc 9 U2 232 SEE BATTERY OPTION DESCRIPTION DB9 FEM BATT_IN D2 1N4148 5 Q1 FTZ788B R3 1 1K SEE ANTENNA SUPPLY 5V 12V DESCRIPTION Q2 i 1N4001 D6 2n7002 ADM707 R20 1 5k VIN 2 51 7 ON 5V OFF 12V DEVELOPMENT KIT OPTIONS Document Number EVALBSH2 DWG DEVELOPMENT KIT OPTIONS Page A 6 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION GPS MONITOR SOFTWARE INSTALLATION 1 If you are using Windows 3 1 or Windows NT 3 51 Place the GPS Monitor diskette in your floppy drive In the Windows Program Manager select File gt then type a install and click OK Note the GPS Monitor software will be loaded into directory You should now have a GPSMon Group containing two icons GPSMon exec icon just double click on this icon to start the GPS Monitor Help icon just double click on this icon to get help information on the GPS Monitor and ALLSTAR or SUPERSTAR 2 If you are using Windows 95 or Windows NT 4 0 Insert the GPS Monitor diskette in your floppy drive From the task bar select Start gt Run then type aAinstall and click OK Note the GPS Monitor software will be loaded to directory c e
9. Menu T NOTES A 521 thrt b 0 BET 0 ien eii tie e eie B VE it eco edes A 0 sa Ba eT e NORTON A 8210 55 eese E Re Tere B DR B bd T ie 0 db tana ond 0 ELDER it ad teres A 5 13 thiru 532 1 ie 0 ovt tet 0 tute E bec bea PO A ame E 0 227 0 B ap EET 0 2 9 thru 2 11 2 022 4 0 LI MM A 2 12 20 tette B Vom 0 2x14 on estem in 0 YS AERE ERE A 2515 2 10 nmn senis B 751 B Qs 0 ee Satta le de t dada 0 C m aient 0 een CIMA B 2 thru 7 00422201 0 c p 0 PEO NO PNE A Page LEP 1 Revision B July 9 2001 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION LIST OF EFFECTIVE PAGES CERES 0 ccce is dama dae edi dice A B 1 thru 0 B 4 thru 5 6 A I
10. electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION INTRODUCTION CONTENTS Subject Page PURPOSE OF THE MANUAL c2ceccecceceeceescececceececcsccecesceacessenceaesecsaesceasesceaseascaseaeseesaeenseseeseasearenseaees 1 1 SYSTEM OVERVIEW ere tdeo enin ede e etd ort bere e Ree Queue 1 1 RELATED 65 1 4 EQUIPMENT IDENTIFICATION 2 secesseccecsecceceecceceeceecceceeseacesececeaeseececesccasesceaseaecaseaesaceaesceseeneasesenseaees 1 4 SYSTEM ARCHITECTURE vcevscscssciccavsccecvaveseisvessuersdaversaceavsexnsvatestnerusveavusneceaavsavarensvavesruavuerenvadnsavencitncenenwivasse 1 4 Page 1 i April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page 1 Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION INTRODUCTION PURPOSE OF THE MANUAL This user manual defines the design operational characteristics physical interface functional and performance requirements for the receiver along with the installation and operation procedures SYSTEM OVERVIEW The receiver is a Global Positioning System GPS Standard Positioning Service SPS single board twelve channel code differential base station receiver for embedding in Original Equipment Manufacturer OEM consu
11. 000 IN INCHES OPTION NOT AVALIABLE WITH THIS MODEL L MAGNET MAGNET IM TERNAL RM EMOVABLE HD HEAVY DUTY GAN 2 db 0 PASSIVE 2 db 20 6 db 35 mA 6 db 50 XX OTHER VOLTAGE XX OTHER STANDARD MODEL 575 68 000 05 26 RIGHT ANGLE CONNECTOR ADD R TO CONNECTOR NOTATION THIS OPTION AVAILABLE FOR CABLED ANTENNAS ONLY NOTES UNLESS OTHERWISE SPECIFIED 1 LOGO OPTIONAL 2 SIZE SHAPE AND CONTENTS OF NAMEPLATE ARE SUBJECT TO CHANGE WITHOUT NOTICE ZAN ASSEMBLE ANTENNA TO ADAPTER USING 4 SCREWS ON CROSS MOTION DO NOT OVER TORQUE THE SCREWS GPS Pre Amplifier Antenna AT575 68 Rev F TION 1575 MHz 10 MHz RIGHT HAND CIRCULAR 3 dB 4 0 0 10 dBic O lt lt 75 2 5 dBic 75 lt lt 80 4 5 dBic 80 lt lt 85 7 5 dBic 90 SPECIFY WHEN ORDERING 2 5 dB MAX 50 OHM lt 2 0 1 35 dB 1 WATT WEATHERABLE POLYMER MATT TEXTURE SPECIFY WHEN ORDERING 4 OUNCES 55 000 5 TO 85 C 00 160 CAT F2 AB CLY XSFDFSXXXXXXX2AC ARINC 743 MIL STD 810C 5541 5400 MIL E 5272C NUMBER 201 990147 432 SPECIFICATION FREQUENCY POLARIZATION AXIAL RATIO RADIATION COVERAGE VSWR IMPEDANCE POWER HANDLING FINISH WEIGHT ALTITUDE TEMPERATURE DESIGNED TO 1575 MHz 10 MHz RIGHT HAND CIRCULAR 3 dB MAX 4
12. Address field for sentences in the NMEA standard the fixed length field following the beginning sentence delimiter HEX 24 For NMEA approved sentences composed of a two character talker identifier and a three character sentence formatter For proprietary sentences composed of the character P HEX 50 followed by a three character manufacturer identification code Almanac a set of orbit parameters that allows calculation of approximate GPS satellite positions and velocities The almanac is used by a GPS receiver to determine satellite visibility and as an aid during acquisition of GPS satellite signals Attenuation reduction of signal strength Azimuth the horizontal direction of a celestial point from a terrestrial point expressed as the angular distance from 000 reference clockwise through 360 The reference point is generally True North but may be Magnetic North or Relative ship s head Bearing the horizontal direction of one terrestrial point from another terrestrial point expressed as the angular distance from a reference direction usually measured from 000 at the reference direction clockwise through 360 The reference point may be True North Magnetic North or Relative ship s head Carrier the steady transmitted RF signal whose amplitude frequency or phase may be modulated to carry information Checksum by NMEA standard a validity check performed on the data contained in the sen
13. SERIAL DATA INTERFACE The receiver includes 2 standard serial input output interface ports and one optional port The ports are designated the Primary Port and the Auxiliary Port Both ports operate independently with baud rates adjustable from 300 to 38 4 K baud The Primary Port supports data input for receiver configuration and control and data output navigation results receiver status etc The Auxiliary Port supports data input roving unit mode or output base station mode for differential correction data adhering to Ref 2 Both ports can be used for S W reprogramming refer to Appendix F Refer to Appendix C for the electrical characteristics A Primary Port The Primary Port supports communication via the CMC Binary protocol Through specific CMC Binary messages the primary port is re configurable to communicate with a PC based Monitor named StarView for extensive monitoring of SV tracking measurements and navigation status The default baud rate is 9600 but can be reconfigured see CMC Binary message ID 110 If no default message list has been stored in NVM the receiver will output the CMC Binary message ID 20 at a rate of once per second after each power up B Auxiliary Port The auxiliary port input is used to receive roving unit mode or transmit base station mode RTCM differential messages Ref 2 The default baud rate is 9600 and can be modified via the CMC Binary Set DGPS Configuration message ID 83
14. 3 5 OPERATION irre ee ER eee vesc eine ae 4 1 RECEIVER STATE Sernis ARN 4 1 A NON OPERATIONAL 5 4 1 OPERATIONAL STATES enia neret tti nti eee hene ne Ck dag ee enn ER a 4 1 IDATUM SUPPORT tasse orsa eaae ee e aee eee ERE Ree ede 4 4 POWER UP 2 4 4 4 BOOT INFORMATION erigat ence tet o coto delle cele has Genet 4 4 B OPERATIONAL INFORMATION 4 5 CONFIGURABLE 5 22224 122 nnn rnnt 4 5 BASE STATION 4 5 d 4 7 ANTENNA POSITION iieri dne aeo nne tcn ec 4 7 DATA REQUESTS ise 4 7 SERIAL DATA INTERFACE veces loan 5 1 SERIAL DATA PROTODQCOL neri Encre nunne nnmnnn nnmnnn nnmnnn 5 1 PHYSICAL LINK LAYER iuter tnn ud e tede nn te tete tied etta ene 5 1 B DDATA EINK LAY ER rate eta ter erede nane E Red d e 5 1 INITIATION E 5 4 D DATA TRANSMISSIQN5 iiti iet dta ith date e n A deed 5 4 E ERROR RECOVERY 5 5 CHECKSUM CALCULATION RULES sese
15. CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION LIST OF ILLUSTRATIONS PAGE Receiver Single 1 2 Related Publicatioris f ecd f t dtt 1 4 Equipment Identification 1 4 RTeSTAR Block 2 424 4 24 000 iadaaa nnne nnns 1 5 Equipment 1 5 Position and Velocity Outputs ie repre ett E dd t Hep p e 2 1 Receiver OEM Board Outline Drawing VAR 101 sse 2 4 Receiver OEM Board Outline Drawing VAR 102 103 100 2 5 Environmental Categories 2 7 SAE Composite Curve Random 2 7 Power 2 11 Time feel eevee eel eerie 2 14 GPS Timing 2 14 Non Volatile Memory Dalda 2 16 Receiver Operating 4 2 TC v April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page TC vi Revision A Sept 2000
16. electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION Il RECEIVER SPECIFICATIONS CONTENTS Subject Page NAVIGATION PERFORMANCE c scecsesessssessesssseeseseceecseeeseseessesesessevsesesessevseseseesecsavaesesessevarsesanseversesanencese 2 1 gt n oleae erste aE estes a eat 2 1 BTIME TO RIRST EDCUT TEE eiectus edi acad 2 2 HEGEIVER PERFORMANGE seb 2 2 PHYSICAE CHARAGTERISTICS 2 4 OUTLINE de 2 4 B PACKAGING DESCR T ON dh th A 2 6 RELIABILITY 2 E E ra 2 6 ENVIRONMENTAL AND 2 6 DESIGN AND CONSTRUCTION c cccesesssssssesssssscesesserseceseseusecessesersersesesessevseseseesevseseeesaveeseesesaneesesensanensess 2 8 MATERIALS PROCESSES AND PARTS oie 2 8 EQUIPMENT MABKINGS 52 teeth Iob eee rte brc actas beso hne 2 8 C BUILT IN TEST BI TRE OUI isa an
17. gt 1092 770 PIN 19 PIN 1 PIN 20 REVERSE STRAIGHT HEADER BOTTOM VIEW 945 24 0 210 050 330 PIN 20 TN 5 33 lt 8 38 ENSE ber PIN 19 PIN 1 e a 100 pe 2 54 mm TOLERANCE x 007 0 18 Figure 2 3 Receiver OEM Board Outline Drawing Var 102 103 100 G704085acdr Page 2 5 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION B PACKAGING DESCRIPTION The receiver assembly consists of one PCB containing a shielded RF digital and I O sections located on both sides of the PCB and a surface mount connector The receiver does not require heat sinking to a metal case Mechanical packaging of the receiver is designed to allow for mounting within various different configurations of OEM units 1 Weight Limits The receiver weight limit is 1 76 ounces 50 grams maximum 2 Size The receiver size is Height total including components 0 55 in 1 4 cm Length 4 00 in 10 2 cm Width 2 65 in 6 7 cm See Figures 2 2 and 2 3 for outline drawings RELIABILITY A design goal of 55 000 hours MTBF for a Ground Fix environment is pursued through a robust design when the receiver is installed in an OEM unit offering reasonable environmental protection The high reliability is ensured through concurrent engineering practices covering all aspects of the electrical and mechanical design Attention is paid to all features that affect the producibility testa
18. 32 short float N A as per ch 1 as per ch 1 as per ch 1 as per ch 1 Current Channel 6 89 Assignment Data 7 12 20 Navigation Solution 5 14 ___ SEC Data set number Channel 7 12 assignment data The message is output once per second upon reception of a message ID 20 request The latency on this message is less than 0 5 seconds The latency defined here refers to the time difference between the time tag of the computed position and the time of transmission of the first message byte UTC Time 5 bit 0 4 gt hour in day 6 gt minute in day 7 14 gt seconds in day 5 bit5 gt 0 time not corrected by UTC parameters 1 time corrected by UTC parameters N A as per ch 1 N A hour minute seconds N A N A as per ch 1 N A byte byte double N A Page 5 14 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION MESSAGE BYTE DESCRIPTION UNIT TYPE 20 15 18 Date Cont d 15 bit 0 6 gt Day of the year day byte 16 gt Month of the year month byte 17 18 gt year year word 19 26 Latitude radians double 27 34 Longitude radians double 35 38 Altitude meters float 39 42 Clock Bias meters float sec 43 46 Clock Drift radians float 47 50 Velocity North meters float sec 51 54 Velocity East meters float sec 55 58 Velocity Up meters float sec 59 62 HFOM meters float 63 66 VFOM meters float
19. 55 South American 1969 South_America_1969 57 1 41 Argentina Bolivia Brazil Chile Colombia Ecuador Guyana Paraguay Peru Trinidad amp Tobago Venezuela 56 South American 1969 1969 60 2 41 Brazil 57 South American 1969 South America 1969 44 6 36 Colombia 58 South American 1969 South America 1969 45 8 83 Venezuela 59 South Asia Modified Fisher 1960 7 10 26 Singapore Tananarive Observatory 1925 61 Tokyo Bessel 1841 148 507 685 Japan 62 Tokyo Bessel 1841 128 481 664 Mean Value 63 WGS 1972 WGS 72 0 0 0 Global definition International 242 91 Madagasgar Page E 3 April 17 2000 CAC electrenics ELLIPSOID DESCRIPTION TABLE Ellipsoid name Airy Airy_modified Australian_National Bessel 1841 Bessel 1841 in Namibia 1866 1880 Everest Sabah 8 Sarawak Everest 1830 Everest 1948 Everest 1956 Everest_Modified GRS 80 Helmert 1906 Hough International Krassovsky Modified Fisher 1960 SGS 85 South America 1969 WGS 72 WGS 84 USER S MANUAL ALLSTAR DGPS BASE STATION Semi major axis a 1 1 Inverse flattenning 6377563 3960 299 324964600 6377340 1890 299 324964600 6378160 0000 298 250000000 6377397 1550 6377483 8650 6378206 4000 6378249 1450 6377298 5560 6377276 3450 6377304 0630 6377301 2430 6377304 0630 299 152812800 299
20. AT575 32W TNCF 000 RG 26 NM NOTES UNLESS OTHERWISE SPECIFIED O RING AND 4 SCREWS SUPPLIED BY AEROANTENNA TECHNOLOGY ZX 1060 OPTIONAL AIRCRAFT CLEARANCE HOLE 8 500 CLEAN EXCESS BONDING MATERIAL LEAVING SMOOTH FILLET AROUND APPLY SEALENT NOTICE DIRECTION OF NUT COUNTER BORE TO FACE CABLE ASSEMBLY INSTALLATION SUGGESTIONS 1 THE LOCATION CHOSEN TO MOUNT THE ANTENNA MUST BE A HIGH POINT FREE OF ANY OBSTRUCTION CHOOSE A LOCATION THAT WILL NOT EXCEED THE RECOMMENDED COAX LENGTH USE ONLY THE RECOMMENDED CABLE DO NOT USE ADDITIONAL SPLICES OR CONNECTORS AVOID LOCATIONS THAT WILL SUBJECT THE ANTENNA TO EXHAUST CONTAMINATION MOUNT THE ANTENNAS AT LEAST TWO FEET FROM ANY OTHER ANTENNA IT IS RECOMMENDED TO SEAL THE CONNECTION OF THE CABLE AND ANTENNA USE SIKAFLEX 221 TYPE SEALER OR EQUIVALENT APPLY AN ADEQUATE AMOUNT OF SEALER TO CABLE CONNECTOR AFTER IT IS CONNECTED TO THE ANTENNA COVER THE ANTENNA AND CABLE CONNECTOR WITH SEALER INSURE LEAK PROOF SEAL CAUTION TRIM AWAY ANY EXCESS SEALER AND DO NOT SPREAD SEALER TOWARD BASE MOUNT 7 CHECK ANTENNA RECEPTION WITH GPS RECEIVER 9806018 SPECIFICATION FREQUENCY 1575 MHz 10 MHz POLARIZATION RIGHT HAND CIRCULAR AXIAL RATIO 3 dB MAX RADIATION COVERAGE 4 0 dBic 0 10 dBic 0 0 lt 75 2 5 dBic 75 lt 0 lt 80 45 dBic 80 lt 0 lt 85 7 5 dBic 90 AMPLIFIER NOISE FIGURE 2 5 dB MAX IMPE
21. The new configuration will be stored in NVM The output port is used to transmit RTCM differential message when the receiver is acting as a base station NON VOLATILE MEMORY DATA The receiver stores in NVM different types of information used to accelerate the TTFF and to configure the refer to Figure 2 9 for a partial list of data stored in NVM Page 2 15 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION PARAMETER NOTES ALMANAC The most recent one Position in NVM is updated at different rates depending on the application LAST POSITION The last known position is always kept in battery back up SRAM DGPS CONFIGURATION RS232 Contains the following configuration information CONFIGURATION Mode of operation Baud Rate 300 to 38400 Default CMC Binary message list Time Alignment Mode State Mask Angle 6 Used Datum BASE STATION Position and message rates base station configuration only PARAMETERS Figure 2 9 Non Volatile Memory Data e Ro I Page 2 16 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION INSTALLATION AND VERIFICATION CONTENTS Subject Page EQUIPMENT 14 tnnt ranana enaena aaran ss 3 1 ELECTROSTATIC DISCHARGE 5 65 4 4 0
22. gt JACK 8 00 67 3 RECEPTACLE l 160 MAX 2X 150 j 3X 2 350 4 06 14 92 59 7 lt gt 312 oso 2 550 lt 1 415 gt 7 92 070 008 05 13 98 35 94 lt gt 200 1 78 2 1 27 6 08 TYP X ub 500 12 70 y 2 6 _ FILTER 1 26 32 0 HOUSING 1 353 2 050 34 37 Y 52 07 TCXO 720 18 3 4 000 101 6 v 2X 3 700 d Y ra 93 98 HEIGHT OF COMPONENTS ON SOLDER SIDE TO BE 150 MAX PIN26 PIN 1 8X 300 7 62 Y do Ji Y X oy 5X 125 2X 150 3 18 3 81 469 lt gt i 062 11 91 1 57 mm 587 1 325 gt M 14 92 33 66 TOLERANCE 007 0 18 G704085cdr Figure 2 2 Receiver OEM Board Outline Drawing VAR 101 Page 2 4 April 17 2000 USER S MANUAL cme electrenics ALLSTAR DGPS BASE STATION Figure 2 3 shows the receiver OEM board outline for VAR 102 right angle connector VAR 103 straight header connector on top side VAR 100 straight header connector on bottom side STRAIGHT HEADER TOP VIEW 100 210 2 54 5 33 E STRAIGHT HEADER 330 gt 8 38 050 945 1 27 RIGHT ANGLE VIEW L380 8 89 RIGHT ANGLE ka 640 1 509 400 J3 5 m 1 10 16 430 1 300 gt lt
23. 1 1024 cycle bits 12 31 Integrated Number of Cycles cycles range natural roll over 26 Cycle Slip Counter cycle slip unsigned Increment by 1 every time a cycle slip is char detected during a 10ms period range natural roll over Measurement block 2 as per as per block 1 block 1 Measurement block N 33 5 bit 0 3 Total number of Satellites in view N A N A Satellite Visibility Data bit 4 7 reserved and Status Data transmission of up to 12 satellites in view listed in decreasing elevation order Satellite visibility data of the 1 SV 6 Computed data bit map N A N A bit 0 4 SV Number bit 5 6 SV Status 0 In View 1 Tracking 2 MeasReady 3 Used by Nav bit 7 Differential Corrections available 7 Elevation degree signed range 90 90 char 8 9 Azimuth degree word range 0 360 bits 9 15 Reserved 10 SNR dB byte range 0 90 Page 5 16 April 17 2000 cme electrenics USER S MANUAL ALLSTAR DGPS BASE STATION MESSAGE BYTE DESCRIPTION UNIT TYPE 33 11 15 Satellite visibility data of the 2 SV as per SV1 as SV1 16 20 Satellite visibility data of the 3 SV as per SV1 as SV1 21 25 Satellite visibility data of the 4 SV as per SV1 as per SV1 26 30 Satellite visibility data of the 5 SV as per SV1 as per SV1 31 35 Satellite visibility data of the 6 SV as per SV1 as per SV1 36 40 Satellite visibility data o
24. 1 12 51 Initiated BIT result UR 1 40 63 Initiate link PM 0 1 14 65 Raw DGPS Data PM VAR VAR 125 Link overload error message PM 1 22 126 Acknowledge message PM 0 1 11 LEGEND CM Command Message DR Data Request PM Protocol Message Note for PM and SM The protocol messages PM and status messages SM are scheduled to be output once per second or per 100 msec Note Transmitted twice per second when in 2 Hz PVT mode Page 5 13 April 17 2000 cme electrenics USER S MANUAL ALLSTAR DGPS BASE STATION B MESSAGE CONTENT RECEIVER TO HOST CPU MESSAGE DESCRIPTION UNIT TYPE 6 5 Current channel assignment data 1 6 6 11 14 15 18 19 20 33 34 47 48 61 62 75 76 89 Data set number Channel 1 assignment data SV and type bit O 4 SV 0 31 bit 5 7 Reserved Carrier frequency resolution cycles SNR Reserved Status Bit 0 1 encodes tracking state 00 not ready 01 bits ready 10 gt meas ready 11 gt failed Bit 2 3 encodes allocation state 00 gt idle 01 gt location 10 gt tracking Bit 4 encodes channel mode 1 gt automatic 0 gt manual Channel 2 assignment data Channel 3 assignment data Channel 4 assignment data Channel 5 assignment data Channel 6 assignment data cycles dB Hz N A as per ch 1 as per ch 1 as per ch 1 as per ch 1 as per ch 1 N A as per ch 1 N A unsigned
25. 152812800 294 978698200 293 465000000 300 801700000 300 801700000 300 801700000 300 801700000 300 801700000 6378137 0000 298 257222101 6378200 0000 298 300000000 6378270 0000 297 000000000 6378388 0000 297 000000000 6378245 0000 298 300000000 6378155 0000 298 300000000 6378136 0000 298 257000000 6378160 0000 298 250000000 6378135 0000 298 260000000 6378137 0000 298 257223563 Page E 4 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX F SOFTWARE REPROGRAMMING MODE CONTENTS Subject Page ence M F 1 PROGRAMMING MODE 2 024 4 020012 4 1417 4401 7 04002000 F 1 HOW TO VERIFY IF IN PROGRAMMING MODE OR NOT 4 1440201 1 4 141144704 4 004 81204 04 0040000 F 2 WHICH PORT TO USE cn F 2 PROGRAMMING UTILITY rn emanat dieu dae LM Td EE F 2 PHOG EXE PARAMETERS aa F 3 PROGRAMMING UTILITY ALGORITHM 2 2 20 00 F 4 Page F i April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page Revision A Sept 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX F SOFTWARE REPROGRAMMING MODE GENERAL The receiver has an integrated reprogramming facility The receiver has Flash Memory devices that allow s
26. 16 N A N A bit map bit O SV 17 bit 7 gt SV 24 N A N A bit map bit 0 gt SV 25 bit 7 SV 32 N A N A 91 Message type and protocol N A N A Differential Message bits 0 5 0 Clear All Messages Configuration 1 63 Message Type bits 6 7 00 RTCM 01 Reserved 10 RTCA 11 Reserved Rate 0 Stop transmitting 1 255 every xx second s seconds byte 103 Enter the date and time UTC This data N A N A Set Date Time amp GPS is accepted only if a SV is not presently Time Alignment Mode being tracked and if password is valid Page 5 11 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION MESSAGE BYTE DESCRIPTION UNIT 103 2 bit 7 0 Valid Time 1 Invalidate the internal N A N A Cont d time 3 bit 7 1 Valid Time O Invalidate the internal N A N A time 5 12 Password in ASCII format U character N A char 8 first UGPS 000 the date and time parameter will be applied UGPS 001 the date and time parameter won t be applied but will force the receiver to align its measurements and TIMEMARK signal on GPS time after the next power up A master reset is requested 10 seconds after the acknowledge of the message ID 103 to ensure the proper operation of the time alignment function Contact CMC for more information UGPS 002 The date and time parameter won t be applied but will force the receiver to not align its measurements and TIMEMARK signal on
27. 5 5 DATA eue ere ie aee vere EROS 5 6 MESSAGE 5 7 HOST CPU 565 6 2 2 1 5 8 A MESSAGE 5 nennen 5 8 B MESSAGE CONTENT HOST CPU TO RECEIVER 5 9 RECEIVER TO HOST CPU 55 5 2 2 2 2 5 13 MESSAGE SUMMARY re iet 5 13 B MESSAGE CONTENT RECEIVER TO HOST 5 14 Page TC ii April 17 2000 SECTION VI VII CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION TABLE OF CONTENTS CONT D PAGE PRODUCT TEST AND QUALITY ASSURANCE PROVISIONS 6 1 QA CONFORMANCE TESTING 22 6 1 STANDARD TEST 65 2 024 442 6 1 USER DEFINED TESTS nue 6 1 SERVICE AND SUPPORT 225222 heeled ieee alae 7 1 POINTS OF CONTACT 00 4400 40 nnana neen na 7 1 SERVICE AND REPAIRS ec roe toc tenses Cora pec cc rne Lr ree m loaves a cececeecceeeesscoseteete 7 1 PRODUCT UPDATED ince 7 2 TROUBLESHOOT
28. 67 70 GPS Time 0 604800 meters float 71 bits 0 4 NAV Mode N A N A 0 gt Init Required 1 gt Initialized 8 gt BaseStation 9 gt CodeNav 10 gt 72 bits 0 3 Number of SVs used the N A N A solution bits 4 7 Reserved Reserved N A N A 75 Week Number 76 77 Checksum N A N A 22 This message contains information for Ephemeris Data one Satellite ephemeris data It is transmitted at a rate of one message per second until all ephemeris data list completed and then transmit only if new ephemeris occurs The user is directed to ICD GPS 200 for specifics on the format of the ephemeris data 5 bits 0 4 SV Number N A N A bits 5 7 reserved Ephemeris sub frame 1 3 words 3 10 N A N A MSB of byte 6 is the Bit 61 of subframe 1 Page 5 15 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION MESSAGE BYTE DESCRIPTION UNIT TYPE 23 5 6 Reserved N A N A 10 Hz Measurement 7 Number of measurement blocks N N A N A Block Data 8 15 Predicted GPS Time double seconds 16 bits 0 5 SV 0 31 N A N A bit 6 reserved bit 7 Toggle at each Ephemeris Transmission 17 SNR 0 25 dBHz unsigned char 18 21 Code Phase 1 1024 half chip 1 1024 unsigned range 0 2095103999 half chip long 22 25 Integrated Carrier Phase bit 0 1 0 Ready 1 Phase Unlock 2 Cycle Slip Detected 3 Not Ready bits 2 11 Carrier Phase 0 1023
29. 990146 789 PART NUMBER 201 990146 7166 MCXM5 SPECIFICATION FREQUENCY POLARIZATION AXIAL RATIO RADIATION COVERAGE IMPEDANCE VSWR POWER HANDLING FINISH CONNECTOR WEIGHT ALTITUDE TEMPERATURE DESIGNED TO 1 06 NAMEPLATE LOCATION 1575 MHz 10 MHz RIGHT HAND CIRCULAR 3 dB MAX 4 0 dBic 0 1 0 dBic 0 lt 9 lt 75 2 5 dBic 75 lt 9 lt 80 50 OHM lt 1 5 1 1 WEATHERABLE POLYMER WHITE TNC FEMALE 89 69 3 2 OUNCES 20 000 55 C TO 85 C 160 ENV F2 AB CLY XSFDFSXXXXXXXL2AC MIL STD 810C 5541 5400 MIL E 5272C 9806017 Outline Drawing GPS Antenna 1575 MHz AT575 97CA Rev Page D 8 April 17 2000 23 00 cmc electrenics 4x 90 156 CBORE 9 235 350 FROM BOTTOM 8 25 64 MAX 350 REF 5 8 11 THREAD TNC FEMALE Cox LOCATION 9804049 3 00 COLOR WHITE S 5 GRAY 0 OUVE DRAB CONNECTOR TNCM TNC MALE TNCF TNC FEMALE BNCM BNC MALE BNC FEMALE MCXM MCX MALE MCXF MCX FEMALE SMAM SMA MALE SMAF SMA FEMALE NTPM TYPE MALE NTPF TYPE FEMALE 0000 NO TERMINATION CABLE LENGTH 000 IN INCHES OPTION NOT AVALIABLE WITH THIS MODEL STANDARD MODEL USER S MANUAL ALLSTAR DGPS BASE S
30. GPS time 13 15 UTC Time HR MN S byte byte resolution 1 second C byte 16 19 Data DY MO Y byte byte resolution 1 day byte 105 bit 0 Reserved N A N A Set Default CMC Binary bit 1 Message ID 1 Flag Message List 0 won t be transmitted 1 will be transmitted bit 2 Message ID 2 Flag 0 won t be transmitted 1 will be transmitted bit 3 7 Message ID 3 7 Flags 0 won t be transmitted 1 will be transmitted 6 20 Message ID 28 127 Flags N A N A 21 28 Reserved 110 5 bits 0 6 Baud Rate in 300 bauds unit N A N A Configure Main Port 12300 3229600 64219200 Mode 65238400 bit 7 Mode 1 CMC Binary 0 NMEA Page 5 12 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION DESCRIPTION UNIT TYPE 112 5 Baud Rate 1 300 32 9600 300 bauds N A Switch to 64 19200 Reprogramming Mode RECEIVER TO HOST CPU MESSAGES A MESSAGE SUMMARY ID DEFINITION MESSAGE TYPE RATE BYTES SEC 6 Current channel assignment data 1 6 UR FR 1 91 7 Current channel assignment data 7 12 UR FR 1 91 20 Navigation data user coordinates UR FR 1 77 22 Ephemeris ICD GPS 200 format data UR FR 1 79 23 Measurement block data UR FR VAR 149 33 Satellite visibility data and status UR FR 1 67 45 Hardware Software identification data UR 1 101 47 Base Station Status data DR 1 50 48 Differential Message Status data DR 1 29 49 Receiver Status data DR
31. OTHER SMAM SMA MALE VOLTAGE SMAF SMA FEMALE 00 PASSIVE NTPM NTP MALE 05 5 voc NTP FEMALE RG 5 TO 18 VDC 0000 NO TERMINATION XX OTHER CABLE LENGTH 000 IN INCHES OPTION NOT AVALIABLE WITH THIS MODEL STANDARD MODEL AT575 90W TNCF 000 05 26 NM NOTES UNLESS OTHERWISE SPECIFIED LOGO OPTIONAL 2 SIZE SHAPE AND CONTENTS OF NAMEPLATE ARE SUBJECT TO CHANGE WITHOUT NOTICE CMC PART NUMBER 201 990146 888 12db CMC PART NUMBER 201 990147 607 26db CMC PART NUMBER 201 990147 680 36db Outline Drawing AT575 90 Rev E 575 75 T_ MAGNET NM MAGNET IM INTERNAL RM REMOVABLE HD HEAVY DUTY GAIN 2 db 00 PASSIVE 12 12 db ma 26 26 db 35 36 36 db 50 mA XX OTHER VOLTAGE 00 PASSIVE 05 5 VDC RG 5 TO 18 VDC OPTION NOT AVAILABLE WITH THIS MODEL STANDARD MODEL ATS75 7STW TNCF O00 RG 26 NM af 13 83 1 5 L1 3 035 77 089MM i 3D REF 914 82 CONNECTOR 1 14 UNC amp 3 4 NPT NAMEPLATE 9804045 PHASE CENTER COLOR WHITE S SMOKE GRAY OLIVE DRAB CONNECTOR INCM TNC MALE TNCF TNC FEMALE 27 00 BNCM BNC MALE BNCF BNC FEMALE MCXM MCX MALE MCXF MCX FEMALE SMAM SMA MALE SMAF SMA FEMALE NTPM N TYPE MALE N TYPE FEMALE 0000 NO TERMINAT
32. TEST AND QUALITY ASSURANCE PROVISIONS CONTENTS Subject Page CONFORMANCE TESTING ue 6 1 STANDARD TEST GONDITIONS oiii ain seed 6 1 USER DEPINED TESTO er 6 1 Page 6 i April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page 6 1 Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION VI PRODUCT TEST AND QUALITY ASSURANCE PROVISIONS QA CONFORMANCE TESTING The equipment is subjected to testing in accordance with this section to demonstrate compliance with this specification Production tests are those tests which are conducted on each production equipment prior to delivery STANDARD TEST CONDITIONS Unless otherwise specified the equipment is subjected to the acceptance tests under the following conditions 1 Temperature Room Ambient 25 deg C 10 deg C 2 Altitude Normal Ground 3 Vibration None 4 Humidity Room Ambient USER DEFINED TESTS The user is encouraged to design a customized test to ensure his system functions properly Page 6 1 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page 6 2 Revision Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION VII SERVICE AND SUPPORT CONT
33. Time Dilution Of Precision TTFF Time To First Fix TXD Transmitted Data UART Universal Asynchronous Receiver Transmitter UDRE User Differential Range Error UTC Universal Time Coordinated VDOP Vertical Dilution of Precision VSWR Voltage Standing Wave Ratio WGS World Geodetic System wpt Waypoint XTE Crosstrack Error Page GOA 3 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page GOA 4 Revision A Sept 2000 SECTION CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION TABLE OF CONTENTS PAGE INTRODUCTION ser 1 1 PURPOSE OF THE MANUAL csi ssscnc ss scdisceecessssscecsteee cast 1 1 SYSTEM OVERVIEW fests Seek restates ac tence te aid 1 1 RELATED PUBLICATIONS nis a es 1 4 EQUIPMENT 4 4 44 4 1 4 SYSTEM ARCHITECTURE 7 6 tree dace reet cu ain 1 4 RECEIVER SPECIFICATIONS 5 2 1 NAVIGATION PERFORMANCE _ 2 1 A IFIGURE OE MERL eerie te hte inet ete e hd e Pere epa 2 1 B 5 2 2 RECEIVER PERFORMANCE cccssseccssesseesesnsceesesnneeesesnneeesesenceesnsnneeesnsnecensnse
34. Using the DGPS base station receiver requires specific hardware equipment The nomenclature and CMC part number or model for the required equipment are listed in Figure 1 3 EQUIPMENT NOMENCLATURE CMC PART NUMBER OR RECOMMENDED MODEL Receiver Base Station 220 600944 10X Base Station GPS Antenna Active Choke Ring Antenna between 12dB and 36cB Base Station DPGS Transmission Antenna Any UHF antenna Base Station Transmitting Modem GLB Model SN2TR96 450 25 Refer to Appendix D or contact CMC for our list of antennas sold separately Figure 1 3 Equipment Identification SYSTEM ARCHITECTURE Figure 1 4 below depicts the block diagram of the receiver assembly Page 1 4 Revision B July 9 2001 CC electrenics if RF AMP FILTER USER S MANUAL ALLSTAR DGPS BASE STATION LOGIC RF TCXO gt CHIP SAW UART FILTER 12 gt CORRELATOR 3 DISCRETE I P S 1 DISCRETE I O 1 PPS c SERIAL SERIAL I O NO 2 SERIAL lt ONO3 OPTIONAL FAST EEPROM SRAM FEPROM 60 MICRO G704086cdr Figure 1 4 Receiver Block Diagram Page 1 5 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page 1 6 Revision Sept 2000
35. When ON discrete 3 is set to LO 1 2 2 When ON discrete IO 2 is set to HI 51 3 4 When ON discrete IO 1 is set to HI 51 4 2 When discrete 2 is set to LO 51 5 IP_1 When ON force programming mode 51 6 PREAMP When ON power is applied to the antenna S1 7 ANT 5VA2V If the antenna voltage regulator option is installed When ON the antenna supply is set to 5 VDC when OFF the antenna supply is set to 12 VDC Without the voltage regulator option the active antenna supply is set to 5 VDC 51 8 BATTERY If the battery option is installed When ON the battery backup is active TIME MARK CONNECTOR The 1 pulse per second 1 PPS time mark signal CMOS level is available on the rear panel connector This 1 millisecond positive pulse can be aligned on the GPS time or free running refer to User s Manual SOFTWARE UPGRADE The Development Kit is forced in programming mode by setting S1 5 to ON Press the RESET button momentarily Prior to programming the GPS Monitor software must be configured to 19200 BPS The terminal window in the GPS Monitor should display w once per second From the menu select Options Programming Select the directory and filename the last 3 digits of the ALLSTAR software number represent the variation e g 613913 058 stands for software variation 058 After programming select the communication port ex COM1 change the communication speed to 9600 BPS if required then set S1
36. a GPS satellite signal The receiver makes provisions for external initialization of data to support faster GPS signal acquisition Figure 1 1 illustrates the receiver single board Page 1 1 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION Figure 1 1 Receiver Single Board Page 1 2 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION The main features are listed as follows Provides differential corrections encoded in the RTCM message format for each satellite tracked Twelve channel correlator for all in view satellite tracking Single chip RF Front End Supports active and passive antennas Single 5V input operation Complete GPS receiver and navigator on a single compact board Operation under standard temperature range 30 C to 75 C Optional extended temperature range 40 C to 85 C 1 PPS Output aligned on GPS Time 200 ns 1 2 5 or 10 Hz Measurement Output Aligned on GPS Time Support for 62 predefined datums Upgradeable software stored in Flash memory via the RS 232 serial port Code and Carrier tracking of L1 GPS frequency for increased accuracy Retention of satellite almanac and ephemeris data in non volatile memory for rapid time to first fix TTFF after power interruption e Very fast signal reacquisition due to signal masking obstruction or vehicle attitude e Two serial input output data ports One for host communication the second one for
37. above which any given satellite must be in order for it to be used in the GPS position solution Low satellites usually do not yield accurate measurements due to weak signal reception and possible multipath Typical mask angle values range from 5 10 depending on the receivers location This value is programmable via command message 81 C GPS ANTENNA POSITION For the base station it is imperative to program the surveyed position of the GPS antenna This can be done using either the X Y Z coordinates in meters within the WGS 84 reference frame or latitude and longitude in degrees as well as height in meters This can be achieved via message ID 80 DATA REQUESTS Data may be requested for output by the receiver for display or logging purposes The list of data request commands and data messages is detailed in the following section Page 4 7 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page 4 8 Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION V SERIAL DATA INTERFACE CONTENTS Subject Page SERIAL DATA PROTOCOL nii 2 iere tice DOC 5 1 AsPHYSICAL EINK LAVER is aha rd eget epe eunte 5 1 BADATA LINK LAYER etit then bate toe eti mette detinet en te 5 1 exigi
38. bit 0 UART not ready or UART busy bit 1 TX not full flag error bit 2 No Data received during internal loop tests bit 3 Framing or Parity error bit 4 RX not full flag error bit 5 OVERRUN test failed bit 6 7 Reserved RTC results bit 0 2 RTC warning bit 3 4 Data Retention register error bit 5 7 Reserved RF Test Results 0 7 RF warning code N A N A N A N A N A N A N A N A N A N A N A N A N A N A N A N A N A N A N A N A N A N A Page 5 19 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION MESSAGE 51 DESCRIPTION UNIT 16 Global Correlator test results 1 N A N A bit 6 Channel 6 error in I amp Q test bit 7 Channel 7 error in I amp Q test Global Correlator test results 2 N A N A bit 0 Channel 0 error in I amp Q test bit 1 Channel 1 error in I amp Q test bit 2 Channel 2 error in I amp Q test bit 3 Channel error in I amp Q test bit 4 Channel 4 error in I amp Q test bit 5 Channel 5 error in I amp Q test bit 6 Channel 6 error in I amp Q test bit 7 Channel 7 error in I amp Q test Global Correlator test results 3 N A N A bit 0 Channel 9 error in I amp Q test bit 1 Channel 10 error in I amp Q test bit 2 Channel 11 error in 1 amp Q test bit 3 Channel 12 error in I amp Q test bit 4 Channel 9 error in Measurement test bit 5
39. block is built with all valid ID s received The acknowledge message will be transmitted in the next available time slot For each individual message block transmitted the transmitter must wait for its corresponding acknowledge or produce a time out error if not acknowledged within 300 ms The transmitter may send additional message blocks at any time All message blocks are treated independently therefore the transmitter do not need to wait for acknowledge before another message block can be transmitted except for file transfer command messages in which case the transmitter must wait for acknowledge message before continuing a file upload Page 5 4 April 17 2000 CMAC electrenics USERS MANUAL ALLSTAR DGPS BASE STATION E ERROR RECOVERY AND TIMING Error detection and recovery are incorporated in this protocol Some of the common error conditions are listed below 1 Block ID Complement Error If the block ID in the header portion does not match the complement block ID number the block must be discarded This means that the data received is probably not a block Checksum Error For the receiver if the calculated checksum value on receipt of a block does not match the value in the block the block must be discarded and this message block s ID is not indicated in the acknowledge message block sent to the transmitter For the transmitter if it detects a checksum error then the block must be discarded and a message block time
40. differential data output Both can be used for the maintenance reprogramming mode On board rechargeable lithium battery optional Custom Application Optional Features Spare CPU time Third serial input output data port Memory expansion FLASH EEPROM and SRAM memories 2 Hz and 5 Hz PVT Output Optional The receiver is available in 3 formats board e within the Development Kit e within the STARBOX casing The Development Kit is an equipment set permitting easy evaluation of the receiver A full description of this kit is provided in Appendix A The STARBOX casing is a special packaging of the receiver A full description of the STARBOX is provided in Appendix B Page 1 3 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION RELATED PUBLICATIONS The related publications are listed in Figure 1 2 PUBLICATION NAME PUBLICATION NAME ICD GPS 200 Rev NAVSTAR GPS Space Segment Navigation Interface 2 RTCM 104 version 2 1 Recommended Standards for Differential January 1994 NAVSTAR GPS Radio Technical Commission for Maritime Services 3 SAE 1211 Recommended Environmental Practices for Electronic Equipment Design 4 NMEA 0183 Rev 2 20 National Marine Electronics Association Standard for Interfacing 5 STARVIEW User s Manual CMC 1205 GEN 0101 Figure 1 2 Related Publications EQUIPMENT IDENTIFICATION
41. exits always to the Acquisition mode Depending on the previous non operating state OFF or SRAM Keep Alive Mode the receiver will retrieve data only from the NVM cold start or from both NVM and the SRAM warm start Integrity checking is done on all data retrieved from the non operating state Page 4 1 Revision B July 9 2001 CMAC electrenics USERS MANUAL ALLSTAR DGPS BASE STATION UPON BIT REQUEST FROM EXTERNAL SOURCE DEAD RECKONING POWER ON G704080cdr Figure 4 1 Receiver Operating Modes During initialization the receiver retrieves the last received valid almanac data and last user position from NVM gets the current time from the low power time source and predicts which satellites are currently visible This list of visible satellites is then used in Acquisition mode to program the 12 parallel correlator channels Acquisition Mode The receiver is in Acquisition mode when insufficient satellite data is available to produce an initial navigation solution Acquisition mode is entered from Initialization or Dead Reckoning mode and exits to Navigation or Fault mode To acquire signals from the GPS satellites the receiver uses a Almanac data which describes the satellite orbits Page 4 2 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION b Time which in conjunction with almanac data is used to estimate the present position of satellites in their orbits c The approxima
42. handling modules This ground should be the same as the equipment ground 4 Do not slide static sensitive modules over any surface 5 Clothing must not come in contact with components or assemblies Short sleeves are preferred if long sleeves are worn then should be rolled up 6 Package parts properly for storage or transportation Modules which are removed from the equipment should be placed into ESD protective packing immediately Do not place any paper card or other plastic inside the ESD protective packing 7 When packing these modules for storage or transportation keep them in the bag Fold over and seal the mouth of the bag to keep out any static generating packing material eg foamed polystyrene Pack around the bag firmly to prevent motion which could generate static WARRANTY In the case of any ESD sensitive module bearing the marking described above which is received by CMC not in ESD protective packing other than the initially reported fault all warranty present or future is voided for failure related to ESD sensitive components Page ED 1 Revision B July 9 2001 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page ED 2 Revision Sept 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION GLOSSARY OF TERMS ASCII A 7 bit wide serial code describing numbers upper and lower case alpha characters special and non printing characters
43. of the block Msg Data Length One byte containing the length of the data part of the message in bytes excluding header and checksum Checksum This fields contains the checksum value for the complete message blocks transmitted which includes header and data The checksum calculations is discussed in more detail below 3 Message Block Types a Host CPU to Receiver Message Types There are 5 types of messages Dummy Message ID 0 Reserved Page 5 2 April 17 2000 CMAC electrenics USERS MANUAL ALLSTAR DGPS BASE STATION Initiate Link ID 63 First message optional to be sent by the transmitter upon entering the protocol Its purpose is to inform the receiver that communication is desired A password is encoded in the message If the receiver was already transmitting data this message will interrupt all output messages and will wait for new data request messages Data Request Messages Request the receiver to turn on off the transmission of broadcast data or to transmit data only once The MSB of the message ID will indicate the type of request with 1 to turn on broadcast and 0 for once only or to turn off the broadcast Command Messages Request a particular receiver action other than a data request The MSB of the msg ID may be used to set the receiver to normal mode MSB 0 or to special mode MSB 1 Data Messages Any message containing data to be memorized or processed by the receiver Receiver to
44. parameters are to be considered the Loss Isolation and Outer Diameter The bigger the Outer Diameter the lower the Loss The Loss increases with the length of the cable and decreases with extra isolation If the highest accuracy possible is not required CMC GPS OEM receivers can accept a total cable loss of 3 dB Depending of the cable type this could represent a cable run from 2 meters up to 10 meters if expensive cable is used Table D 1 details the specifications of the RG 58 Low Loss Cable RG 58 U LLDS80 used in the CMC GPS Antenna Cable 217 601730 XXX The RG 58 U LLDS80 is a custom made low loss noise coax cable made according to AeroAntenna specifications It is a double shielded cable similar to Belden Type 9310 but with the improvement of having 85 miniumum coverage of the second shield versus the Belden at 55 coverage The electrical characteristics are included in Table D 1 Page D 1 Revision B July 9 2001 Insulation cme electrenics Center Conductor USER S MANUAL ALLSTAR DGPS BASE STATION 20 Bare Copper wire Resistance 33 1 ohms per Km Polyethylene Inner Shield Outer Shield Jacket Aluminium Foil 100 coverage Tinned copper braid 85 coverage Resistance 45 9 ohms er Km Black PVC Nominal Impedance Nominal Vel of propagation 50 ohms 66 Attenuation Table D 2 shows the minimum and maximum cable length when using CMC GPS Antenna cable d
45. request this list by sending an e mail to the GPSMARKET the exact e mail address is supplied in section 7 of this document PASSIVE ANTENNA For RTK applications where centimeter level accuracy is required it is strongly recommended to use an active geodetic GPS antenna if possible In the event where the cable length between the receiver and the antenna is very short less than one meter a passive antenna could then be considered The Table D 6 lists the specifications for recommended Passive Antennae patch itself Page D 4 Revision B July 9 2001 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION Table D 6 Passive Antenna Specifications Patch Element Frequenc 1575 MHz 2 MHz Polarization Right Hand Circular Radiation Coverage 4 0 dBic 0 degrees 1 0 dBic 0 elev Angle 75 2 5 dBic 75 elev Angle 80 4 5 dBic 80 lt elev Angle 85 7 5 dBic 85 elev Angle 90 Connector TNC Female most common Other connectors also available Temperature 55 C to 85C Environmental DO 160C Lower cost antennae for higher volume applications or for more cost sensitive applications are available All GPS receivers manufactured by CMC implement a 20dB LNA on board For this reason in many cost sensitive applications it may be necessary to select one of the following passive antennas in conjunction with a low loss coax cable The Table D 7 lists the passive antennae whi
46. section for position initialization details 7 Dead Reckoning Mode The receiver enters Dead Reckoning mode when it cannot remain in a Navigation The speed and direction is assumed constant to allow the receiver to provide an estimated position 8 Fault Mode The receiver enters Fault mode during the period of the time in which the receiver outputs are affected by one or more critical system faults This mode supersedes all others and remains active until the next power down power up cycle Fault mode is entered from any other mode except Initialization C DATUM SUPPORT The receiver has the ability to provide its position in one of the 62 predefined datums The list of all the supported datum is provided in Appendix E Moreover the receiver can also support two user defined datum These have to be defined prior to their use using binary message ID 88 Afterwards the desired datum whether it is user defined or predefined can be selected using CMC Binary message ID 88 POWER UP INFORMATION At power up the receiver sends two categories of factory information data to the main port COM1 at 9600 bauds The categories of information Boot and Operational information can be displayed on a dummy terminal A BOOT INFORMATION The Boot information contains the following factory data ALLSTAR V4 XXXXXXXXXX 169 613914 007 Boot S W Part Number DO PCPB XXXXXXXXXX GO Go in Operational Mode Page 4 4 Revision B J
47. serial port COM2 is used for the differential link and its minimal baud rate stands at 9600 INSTALLATION CONSIDERATIONS All formats of the receiver are not waterproof therefore they must be mounted in a dry location They should also be located where it s convenient for cables to run to the power source display device and antenna Drip loops should also be formed to prevent moisture from running down the cables and into the receiver The receiver should be mounted several feet away from radio transmission equipment A ANTENNA LOCATION 1 The antenna must be mounted high enough to provide an unobstructed view of the sky in all directions The receiver uses satellites that can be as low as 5 above the horizon so nothing should block it from the sky Ensure that the bottom of the antenna is at least 5 inches above the surface it s mounted on The antenna should also be mounted below the radiation plane of INMARSAT or radar antennas and away from any other high power transmittting antennas Page 3 1 April 17 2000 CMAC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION 2 Care should be taken as well to avoid coiling the antenna cable around the mounting base and pinching the antenna cable in window or door jambs BASE STATION LOCATION 1 It is imperative that the base station be located on a site that is above all obscuring elements on the surrounding terrain in order to have all satellites above the horizon visible at the ba
48. temperature range of 40 C to 85 C and supply voltage range 5V 5 Acquisition Sensitivity The receiver is capable of acquiring satellite signals with a minimum input carrier to noise density ratio C N to the correlator of 34 dB Hz Tracking Sensitivity Once a signal has been acquired the receiver is capable of tracking satellite signals with a minimum input carrier to noise density ratio C N to the correlator of 31 dB Hz Input Burn Out Protection The receiver is capable of withstanding a signal level not exceeding 15 dBm at L1 50 MHz without damage Out of Band CW Signal Rejection The receiver in a suitable system configuration is capable of continuous operation under interference conditions specified in Figure 5 Page 2 3 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION PHYSICAL CHARACTERISTICS This section applies to the OEM board version of the receiver For details on the physical characteristics of the Development Kit version of the receiver please refer to Appendix A For details on the physical characteristics of the STARBOX version of the receiver please refer to Appendix B A OUTLINE AND FORM FACTOR Figure 2 2 shows the OEM board outline STRAIGHT gt 315 2 650
49. time HDOP 2D parameters are uncertain latitude longitude VDOP height is uncertain TDOP clock offset is uncertain Doppler the change in frequency of sound light or other wave caused by movement of its source relative to the observer Doppler aiding a signal processing strategy which uses a measured Doppler shift to help a receiver smoothly track the GPS signal to allow more precise velocity and position measurement Earth Centered Earth Fixed ECEF a right hand Cartesian coordinate system with its origin located at the center of the Earth The coordinate system used by GPS to describe three dimensional location ECEF Earth Centered Earth Fixed coordinates are centered on the WGS 84 reference ellipsoid have the 2 axis aligned with the Earth s spin axis the X axis through the intersection of the Prime Meridian and the Equator and the Y axis is rotated 90 degrees East of the X axis about the Z axis Ephemeris a set of satellite orbit parameters that is used by a GPS receiver to calculate precise GPS satellite positions and velocities The ephemeris is used in the determination of the navigation solution and is updated periodically by the satellite to maintain the accuracy of GPS receivers Field a character or string of characters immediately preceded by a field delimiter Page GOT 2 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION Fixed field a field in which the number of ch
50. 0 dBic 1 0 dBic 3 0 dBic 1 5 50 OHM 1 WATT OUTDOOR WEATHERABLE POLYMER 8oz 20 000 55 TO 85 C 00 160 5541 MIL E 5272C CMC PART NUMBER 201 990144 807 12db CMC PART NUMBER 201 990144 589 Odb CMC PART NUMBER 201 990144 791 26db Page D 9 April 17 2000 CAC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION 4 3 2 THIS DRAWING 18 THE PROPERTY OF CANADIAN MARCONI COMPANY AND BE NEITHER USED REVISION STATUS OF SHEETS REVISIONS COPIED REPRODUCED OR OTHERWISE DEALT WITH NOR ITS CONTENTS COMMUN ICATED TO OTHERS 7 5 EXCEPT IN ACCORDANCE WITH WRITTEN INSTRUCT IONS RECEIVED THOM CANADIAN VARCONI COMPANY o o zoue DESCRIPTION DATE APPROVED REV PRODUCT BASELINE RA 98 0004 38 05 06 D C NOTES D PART NO 211 601130 1 1 5 2 DIGITS LENGHT OF CABLE IN METER D 2 CABLE CONSTRUCTION CENTER CONDUCTOR 20 BARE COPPER WIRE RESISTANCE 33 OHMS PER Km INSULATION POLYETHELENE INNER SHIELD ALUMINUM FOIL 100 COVERAGE OUTER SHIELD TINNED COPPER BRAID 85 COVERAGE RESISTANCE 45 9 OHMS PER Km JACKET BLACK PVC NOMINAL IMPEDANCE 50 OHMS NOM
51. 0h 53h 2Dh 30h 30h 30h 04h 03h hexadecimal Page 5 5 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION G DATA STRUCTURE This paragraph describes the data representation standards to be used in formulating the contents of data fields The structures defined are Character Data Integer Values Fixed Point Values Floating Point Values Bom Character Data is to be stored in the following order in the Block data field CHAR 2 CHAR 4 CHAR 6 CHAR 8 Character Data are unsigned by default Integer Values are represented in two s complement form Floating Point Values are stored in IEEE format using little endian method to store data types that larger than one byte Words are stored in two consecutive bytes with the low order byte at the lowest address and the high order byte at the high address The same convention applies for 32 bit and 64 bit values Following is the detail of the floating point format Short Float 32 bits MSB bit 31 Sign Bit 30 23 Exp Bit 22 00 Mantissa 2exp 1 bit22 2 exp 2 bit21 Value Sign 1 mantissa 2 exp EXP 127 Double Float 64 bits MSB bit 63 Sign Bit 62 52 Exp Bit 51 00 Mantissa 2exp 1 bit51 2 exp 2 bit50 Value Sign 1 mantissa 2 1023 For example message ID 6 bytes 11 14 SNR value short Float Page 5 6 April 17 2000 CMAC electrenics USERS M
52. 1 snis stats sn 3 1 EQUIPMENT INTERCONNECTION scceccsseccessssessececseseeeseceerseeesessevsesesessevsecesessevseseeesaveesaesucanensessuvanensese 3 1 INSTALLATION CONSIDERATIONS ccsssccessssssessesseseesecessereesecsesecsevsesesessersesesensevsesecesaneesecsucnsenensesanensese 3 1 A ANTENNA LOCATION tiet betae edet S scu Cini gre bte 3 1 LOCATION sienna e ne semi abii orn uda 3 2 DODATANTINICI S ue dat dme Atte NE MA ioa MD rA eu ed 3 2 D BASE STATION AND ROVING UNITS 0 0450006 eene nennt nnn 3 2 CHOICE OF A WIRELESS DGPS DATA 24 4412 ntn insta tr tnim ssa then ennnen aeaeaei 3 2 NOCT M 3 3 ONE WAY VS TWO WAY DINI neh busi ae beatae aia as 3 4 C LATENCY AND RATE OF DATA TRANSMISSION 3 4 D THE RADIO FREQUENCY USED oett det ode ene etsi et vae eti 3 4 E FREQUENCY SELECTOR ter cele eats hae 3 4 F INTERFERENCE REJECTIONS 3 4 G NETWORK CAPA B EDD 3 5 H WIRELESS DGPS INKOPTICNS
53. 5 to OFF Press the RESET button momentarily Page A 4 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION J2 J1 NOTEB J6 10 16V R17 D3 1N4001 D5 1N4001 ANT SUPPLY 5V vec vec vec 9 w1 R20 10K NOTEC 51 53 j e Hii SUE 1000 3 D4 0 1UF C18 a 3 C47 c5 573 6 IP_1 PROG 1 5KE22A 0 1UF cio 6 71 16 PREAMP PA 470UF pesta aL IN gt IN 100 we PRIMARY vec 14 14 t 2 BATT OUT 1 1 R5 100 15 12 13 44 3 c2 WT 11 A B 5 gt VBATT n 1UF UG FEM DEFAULT JP NOTE A R6 100 ws DGPS JP1A 2B 3A 4A 5B 8 2 DEFAULT 51 R7 100 J3 S1 1 2 3 4 5 OFF 7 8 3 1 6 7 8 ON z C4 1UF Note A vec 5 Battery circuit 9 or W12 installed Note B vec Third Uart option U3E U3F vec Note C 17 010 R18 D11 Antenna supply 19 11 10 13 12 or W1 installed v 1N4148 2 1K DGPS U3D U3c R19 A 74HC14 37 100K 8 9 6 5 C18 1 P 1UF 2b 74HC14 U3A U3B 4 D7 R13 09 TIMEMARK 5 1 2 ANSE 82 4 AA TIMEMARK R11 1K vec R14 100K 74HC14 10K 1 9 3 vec 1UF vec C10 52 GND 9 R12 D8 tur 13 18 TK POWER GPS DEVELOPMENT KIT Document Number ALLSTAR SUPERSTAR
54. A N A Receiver Status request 51 0 PowerUp BIT Results N A N A Initiated BIT request 1 Initiate a Customer BIT 2 255 Reserved 63 This request will cancel all previous data N A char 8 Initiate Link request messages within 2 seconds Password UGPS 000 in ASCII format U character first 64 Set deselection criteria for all 12 channels N A N A Set Channel deselection if password valid The channels to be deselected should be indicated in a bit map form 1 in the bit map specifies that the corresponding channel shall be deselected Page 5 9 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION MESSAGE BYTE DESCRIPTION UNIT TYPE 64 Cont d 5 12 Password UGPS 000 in ASCII format char 8 N A U character first 13 bit map gt ch 1 bit 7 gt ch 8 14 bit map bit 0 gt ch 9 bit 3 gt ch 12 80 1 4 CMC Header N A N A Set Operating Mode U character first where XXX 000 Set User Position AllStar compatible ROO Force to Rover Mode position not saved GSP Get Survey Position BYY Set Base Position and Base Information SYY Force to Survey Mode where YY bytes 11 12 Station ID and Station Health bits 0 9 Station ID 10 bits 1 1023 bits 10 12 Station Health as per RTCM bits 13 15 Reserved 8 Set Mask angle 13 20 Interpreted field 000 BYY Altitude Ellipsoid meters double SYY Survey time 0 0 48 0 h
55. ABLE trenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX E SUPPORTED DATUM LIST NAME ELLIPSE DX DY DZ COUNTRIES O WGS 1984 WGS 84 0 0 0 Global definition 1 User Defined 1 2 User Defined 2 3 Adindan Clarke 1880 161 14 205 Sudan 4 1950 Clarke 1880 143 90 294 Botswana Lesotho 5 1950 Clarke 1880 169 19 2782 6 Arc 1960 Clarke_1880 160 6 302 Kenya Tanzania 7 Australian Geodetic 1984 Australian National 134 48 149 Australia Tasmania 8 Bogota Observatory International 307 304 318 Colombia 9 Campo Inchauspe International 148 136 90 Argentina 10 Cape Clarke 1880 136 108 292 South Africa 11 Carthage Clarke 1880 263 6 431 Tunisia ET Island Astro 1971 International i 38 113 New Zealand Chatham Island 13 Chua Astro International 134 229 29 14 Corrego Alegre International 206 172 6 Brazil 15 European 1950 International 87 98 121 Austria Belgium Denmark Finland France West Germany Gibraltar Greece Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland 16 European 1950 17 European 1950 International 104 101 International 130 117 140 Cyprus 151 Egypt 18 European 1950 International 86 96 120 England Channel Islands Ireland Scotland Shetland Islands
56. ANUAL ALLSTAR DGPS BASE STATION byte 11 85 byte 12 AC byte 13 41 byte 14 42 short float 4241AC85 Sign EXP 132 mantissa 0 5130773782 value 48 4 H MESSAGE STRUCTURE All the messages have the following form byte 1 SOH byte 2 ID See Note 1 byte 3 Cmpl ID byte 4 Message Data Length 0 255 byte 5 n n 4 Data bytes byte ntl 2 Checksum NOTE 1 For transmitter messages MSB 0 one shot or cancel continuous MSB 1 gt continuous unless specified otherwise Page 5 7 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION HOST CPU TO RECEIVER MESSAGES A MESSAGE SUMMARY ID MESSAGE TYPE t BYTES 6 Current channel assignment data request DR 6 20 Navigation data request user coordinates DR 6 22 Ephemeris ICD GPS 200 format request DR 6 23 Measurement block data request DR 7 33 Satellite Visibility Data and Status request DR 6 45 Hardware Software identification DR 6 47 Base Station Status request DR 6 48 Differential Message Status request DR 6 49 Receiver Status request DR 6 51 Initiated BIT request DR 7 63 Initiate link PM 14 64 Set Channel deselection CM 16 65 Raw DGPS Data Request CM 6 80 Set Operating Mode CM 38 81 Set Mask angle CM 18 88 Select Define Datum CM 38 90 Set SV deselection CM 18 91 Differential Message Configuration CM 8 103 Set Date Time amp GPS Time Alignment Mode C
57. ATION P N 220 600944 40X 1210 GEN 0101A COMMENTS PAGE PARA LINE FIGURE TABLE CHANGE AND REASON NO GRAPH NO NO NAME POSITION TELEPHONE E MAIL ADDRESS COMPANY S NAME amp ADDRESS From PLACE POSTAGE HERE CMC Electronics Inc CUSTOMER SUPPORT 600 DR FREDERIK PHILIPS BOULEVARD VILLE ST LAURENT QUEBEC CANADA H4M 259 FOLD BACK CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION LIST OF EFFECTIVE PAGES NOTE The portion of the text affected by the latest change is indicated by a vertical line in the margin of the page Changes to illustrations are indicated by miniature pointing hands or black vertical lines Original April 17 2000 Revision September 2000 Revision July 2001 THE TOTAL NUMBER OF PAGES IN THIS PUBLICATION IS 144 Tithe 0 La A ED f isa B LM B ED 2st euni dna A 4 9 da aids 0 GOT 1 thru 6 0 LE M EI XM B eiiis eh detis B 4 6 s eti aei ees tact 0 GOA 2 thru GOA 3 0 4 8 talibus A 4 A eie E E RR ERO ERES 0 TC i thru 22 2
58. Antenna Gain Antenna gain increases the effective radiated power of a transmitter and the effective sensitivity of a receiver A 5 W transmitter with a 6 dB 4x dipole gain antenna looks like a 20 W transmitter when compared to the same unit on a simple vertical whip with a ground plane A receiver with a 6 dB antenna sees a 5 W transmitter as if it has raised its power to 20W With a 6 dB antenna on both transmit and receive the 5 W transmitter performs like an 80 W transmitter in the case of 0 dB antennas on both ends Page 3 3 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION One Way vs Two Way Link In many applications such as DGPS it is only important to send a message one way In this case the wireless link can be made less expensive by using transmit only and receive only radios This can also reduce the cost size and weight of the link Two way is useful in applications such as tracking AVL and dispatch where the data must be sent back to the base In two way applications that have high update rates and or a large number of users key performance items to look for are over the air data rate and data turnaround time See Latency and Rate of Data Transmission below Latency and Rate Of Data Transmission Latency and rate of data transmission can have a significant effect on the number of users that can be supported on a single radio channel as well as the time it takes to get an update to the base Lat
59. CHAC clectrenics USER S MANUAL ALLSTAR DGPS BASE STATION P N 220 600944 10X Supersedes Publication No 1210 GEN 0101 Dated April 17 2000 CMC Electronics Inc 600 DR FREDERIK PHILIPS BOULEVARD ST LAURENT QUEBEC CANADA H4M 2S9 TEL 514 748 3148 FAX 514 748 3100 CHAC clectrenics USER S MANUAL ALLSTAR DGPS BASE STATION P N 220 600944 10X Supersedes Publication No 1210 GEN 0101 Dated April 17 2000 CMC Electronics Inc 600 DR FREDERIK PHILIPS BOULEVARD ST LAURENT QUEBEC CANADA H4M 2S9 TEL 514 748 3148 FAX 514 748 3100 Publication No 1210 GEN 0101A April 17 2000 Manual No 930 600020 000 Revision B July 9 2001 This Page Intentionally Left Blank CAC electrenics WE VALUE YOUR COMMENTS PLEASE EVALUATE THIS PUBLICATION AND LET US KNOW Although we constantly strive for accuracy and clarity we may make errors on occasion If we do we would appreciate your comments to improve this manual Please use the following Customer Comments form or e mail us at HelpLine cmcelectronics ca to inform us of any correction or send us marked up copy of this publication We will acknowledge your comments and notify you of any intended action Your assistance in improving this manual is sincerely appreciated This Page Intentionally Left Blank PUBLICATION TITLE PUBLICATION NUMBER ITEM NUMBER DATE OF ISSUE REVISION DATE CUSTOMER COMMENTS USER S MANUAL ALLSTAR DGPS BASE ST
60. Channel 10 error in Measurement test bit 6 Channel 11 error in Measurement test bit 7 Channel 12 error in Measurement test Reserved Reserved Password UGPS xxx in ASCII format U N A char 8 character first Control byte N A N A Bits 0 3 Sequence Number 0 15 bits 4 7 Protocol 0 RTCM 1 RTCA 2 15 Reserved N A N A 6 n Raw DPGS data 125 5 20 bit map bit O gt ID 1 bit 127 gt ID 127 N A N A Link Overload Error Message bit O Channel 0 error in I amp Q test bit 1 Channel 1 error in I amp Q test bit 2 Channel 2 error in I amp Q test bit 3 Channel 3 error in I amp Q test bit 4 Channel 4 error in I amp Q test bit 5 Channel 5 error in I amp Q test 17 18 63 Initiate Link 65 5 Raw DGPS Data Page 5 20 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION MESSAGE BYTE DESCRIPTION UNIT TYPE 126 5 ID of first message acknowledged N A N A Acknowledge Message 6 ID of second message acknowledged 7 ID of third message acknowledged N A N A 8 ID of fourth message acknowledged N A N A 9 ID of fifth message acknowledged N A N A Page 5 21 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page 5 22 Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION VI PRODUCT
61. DANCE 50 OHM VSWR lt 2 0 1 BAND REJECTION 35 dB POWER HANDLING 1 WATT FINISH FLUID RESISTANT POLYURETHANE ENAMEL WEIGHT 3 9 OUNCES ALTITUDE 55 000 55 C TO 85 C DESIGNED TO 00 160 F2 AB CLY XSFDFSXXXXXXX2AC ARINC 743 MIL STD 810C MIL E 5400 MIL C 5541 MIL E 5272C CMC PART NUMBER 201 990147 684 12db Outline Drawing GPS Antenna 1575 MHz AT575 32 Rev E Page D 6 April 17 2000 CC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SPECIFICATION FREQUENCY POLARIZATION AXIAL RATIO RADIATION COVERAGE 575 MHz 5 MHz RIGHT HAND CIRCULAR 3 dB MAX 4 0 dBic 0 10 dBic 0 lt 6 lt 75 2 5 dBic 75 lt lt 80 4 5 dBic 80 85 7 5 dBic 90 AMPLIFIER NOISE FIGURE 2 5 dB MAX IMPEDANCE 50 OHM VSWR lt 2 0 1 BAND REJECTION 35 dB POWER HANDLING 1 WATT FINISH POLYURETHANE ENAMEL COLOR WHITE WEIGHT 10 Lbs MAX ALTITUDE 20 000 OPERATING TEMP 55 C TO 85 C DESIGNED TO 00 160 575 90 COLOR L MAGNET WHITE NM NO MAGNET S SMOKE GRAY INTERNAL 0 OLIVE DRAB REMOVABLE CONNECTOR CAN gore TNCM TNC MALE y TNCF TNC FEMALE Dom PASSIVE 12 DB 20 mA BNCM BNC MALE BNCF BNC FEMALE 26 db 35 mA 36 36 db 50 mA MCXM MCX MALE el MCXF MCX FEMALE XX
62. ENTS Subject Page POINTS OF CONTACT CMC ELECTRONICS INC 7 1 SERVICE AND Gra cete mat coda aa viv encre eosam 7 1 PHODUCT UPDATED 7 2 TROUBLESHOOTING AND FREQUENTLY ASKED QUESTIONS FAQ 7 2 CONSULTATION 7 2 Page 7 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page 7 Revision Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION VII SERVICE AND SUPPORT POINTS OF CONTACT CMC ELECTRONICS INC CMC Postal Address CMC Electronics Inc Components Division GPS OEM Group Box 92 600 Dr Frederik Philips Boulevard St Laurent QC CANADA H4M 2S9 WEB Site http www cmcelectronic ca Marketing Sales Tel 514 748 3070 Fax 514 748 3017 Email gosmarket baesystems canada com Contracts PO Shipment Status Tel 514 748 3000 Ext 4943 Fax 514 748 3017 Email gpscontract baesystems canada com Technical Support Tel 514 748 3070 Fax 514 748 3130 Email gpshelp Qbaesystems canada com FTP Site ftp baesystems canada com SERVICE AND REPAIRS All receivers conform to the specifications sta
63. GHT 250 USER S MANUAL ALLSTAR DGPS BASE STATION ATS75 7OX XXXX XXX XX XX XX T MAGNET S SMOKE GRAY IM INTERNAL 0 OLIVE DRAB RM REMOVABLE HD HEAVY DUTY CONNECTOR GAIN 2 db ING MALE 00 PASSIVE 12 12 db 20 VOLTAGE 00 PASSIVE 05 5 VbC RG 5 18 VDC 0000 NO TERMINATION XX OTHER CABLE LENGTH 000 IN INCHES OPTION NOT AVALIABLE THIS MODEL STANDARD MODEL AT575 70W SMAM 120 05 26 RM RIGHT ANGLE CONNECTOR ADD R TO CONNECTOR NOTATION THIS OPTION AVAILABLE FOR CABLED ANTENNAS ONLY x 200 DEEP 4 PLC S ON 1 750 B C NM MAGNET FREQUENCY 35 50 mA SPECIFICATION 1575 MHz 2 MHz POLARIZATION RIGHT HAND CIRCULAR AXIAL RATIO 3 dB MAX RADIATION COVERAGE 4 0 dBic 10 0 lt lt 75 25 dBic 75 lt 0 lt 80 45 dBic 80 lt 0 lt 85 7 5 dBic e 90 AMPLIFIER GAIN 22dB MIN NOISE FIGURE 2 5 dB MAX VOLTAGE 43 7 VDC 10 BIASED THROUGH IMPEDANCE 50 OHM CONNECTOR 30 mA MAX VSWR lt 2 0 1 BAND REJECTION 35 dB POWER HANDELING 1 WATT FINISH FLUID RESISTANT POLYURETHANE ENAMEL COLOR DARK GRAY CONNECTOR SMS FEMALE 522 900 0630H WEIGHT 5 OUNCES ALTITUDE 20 000 TEMPERATURE 20 85 NOTES UNLESS OTHERWISE SPECIFIED LOGO OPTIONAL 2 SIZE SHAPE AND CONTENTS OF NAME PLATE ARE SUBJECT TO CHANGE WITHOUT NOTICE CMC PART NUMBER 201
64. Host CPU Message Types There are 6 types of messages All data is sent in receiver internal format Dummy Message ID 0 Reserved Initiate Link ID 63 This is the response to the transmitter initiate link message Acknowledge Message ID 126 All transmitter messages are acknowledged by the acknowledge message This message is sent as soon as possible if there is at least one message to acknowledge The data field of this message contains 5 bytes which encode the IDs of the messages acknowledged 4 messages per time interval and possibly a message from previous time interval that was not completely decoded So a maximum of five messages may be acknowledged per message ID 0 indicates a dummy message and should be discarded by the transmitter its purpose is only to fill the data field of the acknowledge message block Page 5 3 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION Link Overload Error Message ID 125 Sent by the receiver only when at least one output message caused an overload of the transmission link This message is sent at a maximum rate of once per second This message encodes a bit map of all the message IDs 1 127 therefore indicating which IDs caused the link overload The request of the message that caused the overload is cancelled to prevent any further overload Data Messages Messages containing requested data Status Messages Informs the transmitter o
65. INAL VEL OF PROPAGATION 66 NOMINAL CAPACITY 101 7 Pf PER METER ATTENUAT ION 9 1000MHZ 44 3Db PER 100 METERS e v A LAS 206 SOT PAP NO N MC EP BOOT 1 0 2 3 1 41 om CONNECTOR CONNECTOR 2 TABLE PART NUMBER CONNECTOR CONNECTOR 2 211 601130 001 THRU 099 TNC MALE STRAIGHT TNC MALE STRAIGHT 211 601130 100 THRU 199 TNC MALE STRAIGHT TNC MALE RIGHT ANGLE 211 601130 200 THRU 299 TNC MALE RIGHT ANGLE TNC MALE RIGHT ANGLE 211 601130 300 THRU 399 BNC MALE STRAIGHT TNC MALE STRAIGHT 211 601130 400 THRU 499 BNC MALE STRAIGHT TNC MALE RIGHT ANGLE 211 601130 500 THRU 599 BNC MALE STRAIGHT BNC MALE STRAIGHT Belen pas THIRD ANGLE PROJECTION OME REF ONLY MATERIAL MC CANADIAN MARCONI COMPANY A UNLESS OIRERVISE SPEC TF VED DINENGTONE CBE CANADA A APPLY AETERINISHING AND ARE IW B7 PATE CABLE ASSY COAX TOLERANCE TOLERANCES TOLERANCE D C D GERMAIN fI ALLSTAR XX XXX FINISH DRAWING APPROVAL Sze CAGE CODE nO NEXT ASSY USED ON 6 90073 211 601130 APPLICATIONS H PELLERIN SCALE 1 1 SHEET 4 3 1 2 ieee Page D 10 April 17 2000 CAC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION
66. ING AND FREQUENTLY ASKED QUESTIONS FAQ 7 2 CONSULTATION e 7 2 Page TC iii April 17 2000 SECTION APPENDIX A APPENDIX B APPENDIX C APPENDIX D APPENDIX E APPENDIX F USER S MANUAL ALLSTAR DGPS BASE STATION eme electrenics TABLE OF CONTENTS CONT D PAGE RECEIVER DEVELOPMENT A 1 OV ER VU e A 1 DESCRIPTION EHE A 1 DEVELOPMENT KIT SETUP AND OPERATION cerent A 2 EE A 2 DIP SWITCHES IE A 4 TIME MARK A 4 SOFTWARE 4 GPS MONITOR SOFTWARE A 7 STAR BOX et B 1 OVERVIEW 2 13 eiecti iet eire A B 1 DESGRIPTION SD B 1 RE GONNEGCTOR erp EDD B 3 Borm E B 3 A B 3 EXTERNAL INTERFACE CHARACTERISTICS esee nennen nnne C 1 CONNECTOR PIN ASSIGNMENT 11 C 1 ELECTRICAL CHARACTERISTICS esses ennt nnne C 2 ANTENNA SPECIFICATIONS
67. ION CABLE LENGTH 000 IN INCHES GROUND PLANE i LEVEL 3 00 MAX 1 91 PHASE CENTER 4 NAMEPLATE TNC FEMALE CONNECTOR 1 14 UNS 2B THREAD 5 8 11 ADAPTER OPTIONAL 9804044 SPECIFICATION FREQUENCY POLARIZATION AXIAL RATIO RADIATION COVERAGE AMPLIFIER NOISE FIGURE IMPEDANCE VSWR BAND REJECTION POWER HANDLING MATERIAL FINISH CONNECTOR WEIGHT ALTITUDE OPERATING TEMP DESIGNED TO NOTES UNLESS OTHERWISE SPECIFIED 1 SIZE SHAPE AND CONTENTS OF NAMEPLATE ARE SUBJECT CHANGE WITHOUT NOTICE 2 LOGO OPTIONAL 1575 MHz 2 MHz RIGHT HAND CIRCULAR 0 3 dB MAX 4 0 dBic 20 dBic 0 lt 4 0 dBic 70 lt 5 0 dBic o 70 85 90 2 5 dB 50 OHM 20 1 35 dB 1625 MHz 1 WATT GELOY 1001 WEATHERABLE POLYMER SEE TABLE 13 OUNCES MAX 12 000 4 TO 70 C 00 160 CMC PART NUMBER 201 990146 887 12db CMC PART NUMBER 201 990147 606 26db PART NUMBER 201 990147 679 36db Outline GPS Antenna AT575 75T Rev A Page D 7 April 17 2000 cmc electrenics 53 3mm 2 100 NAMEPLATE 9804047 3 3 00 62 450 RG 174 L 3M SHOWN WITH MAGNET 44 40 UNC 2B GPS Pre Amplifier Antenna AT575 70 Rev B 4X 156 C BORE 9 235 R 25 350 WASHER in Ck NUT ACROSS FLATS HEI
68. M 21 105 Set default CMC Binary message list CM 30 110 Configure Main Port Mode CM 7 112 Switch to Reprogramming Mode CM 7 LEGEND CM Command Message DR Data Request PM Protocol Message Note Variable length 6 94 bytes Page 5 8 Revision B July 9 2001 CMAC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION B MESSAGE CONTENT HOST CPU TO RECEIVER MESSAGE DESCRIPTION UNIT TYPE 6 This request will cause the receiver to N A N A Current channel send both messages ID 6 and 7 No assignment data request data bytes 20 No data bytes N A N A Navigation data request User coordinates 22 Each time a new request is sent the N A N A Ephemeris ICD GPS receiver will transmit a complete set of all 200 format request ephemeris and SV clock data currently acquired In a case of broadcast mode the receiver will transmit a complete set and then transmit only on new ephemeris reception No data bytes 23 Request measurement block data for all N A N A 10 Hz measurement tracked SV s The receiver will respond block data request by sending message ID 23 every 100 msec if requested at 10 Hz bits 0 1 Transmission Rate 0 1Hz 1 2Hz 2 5Hz 3 10Hz 2 7 Reserved shall be 0 45 No data bytes N A N A Software Identification request 47 No data bytes N A N A Base Station Status request 48 No data bytes N A N A Differential Message Status request 49 No data bytes N
69. MP 2 487952 6 or ELCO 00 6200 026 032 800 Following is the list of possible mating Flat Flexible Cable and connector manufacturers a AXON CABLE cable 390 E HIGGINS Road ELK GROVE VILLAGE IL 6000 TEL 708 806 6629 g MIRACO mating and connector 9 PITTSBURG Av P O BOX 1163 NASHUA NH 03061 1163 TEL 603 882 6887 O ELCO USA connector 3250 KELLER Street Unit One SANTA CLARA CA 95054 TEL 408 499 1861 4 42 RF Input Connect The J2 RF input connector is an MCX Sub miniature Snap On Connector straight jack receptacle The following is the list of possible mating connectors compatible with RG316 cable type Right angle OMNI SPECTRA 5807 5001 09 or SUHNER 16 MCX 50 2 5C 111 or RADIALL R113182 Straight OMNI SPECTRA 5831 5001 10 or SUHNER 11MCX 50 2 10C or RADIALL R113082 OMNI SPECTRA M A COM 100 Chelmsford St P O Box 3295 Lowell MA 01853 9910 TEL 1 800 366 2266 HUBER amp SUHNER One Allen Martin Drive P O Box 400 Essex VT 05451 TEL 1 802 878 0555 RADIALL 150 Long Beach Blvd Stratford CT 06497 TEL 1 203 386 1030 Page 2 10 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION 5 J3 Interface and Power Connector The J3 Interface and Power connector is a 0 100 x 0 100 20 Pin Header 3 examples of manufacturer s part numbers AMP 1 103783 0 BERG 67996 120 SAMTEC TSW 1 10 07 S D or a 0 100 x 0 100 20 pin Ri
70. Manual Ref 5 This Appendix explains how to configure the Development Kit and the receiver and how to interconnect the equipment DESCRIPTION The Develo pment Kit Order no 241 600246 XXX contains the following equipment CMC PART NUMBER 100 600266 XXX DESCRIPTION Development Kit Unit with built in ALLSTAR or SUPERSTAR receiver card 12dB Active GPS Antenna with 20 ft cable AT 575 70W MCXM 240 0 50 12RM GPS Monitor Software diskette 189 613931 002 201 990146 789 1 Cable Assy DB 9 Female to DB 9 Male 217 990147 593 Power Supply Adapter 120VAC to 12VDC 504 990147 682 1 t 1 ALLSTAR or SUPERSTAR User s Manual 1826 1127 1 Schematic and Description of the Development Kit the last 3 digits of the part number corresponds to the GPS Receiver Part Number which depends on the connector type and software options Please refer to the price list for a full description Page A 1 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION DEVELOPMENT KIT SETUP AND OPERATION GPS Development Kit 1 st MARK DGPS RESET J 8 e o POWER TIME MARK ACTIVE 27 DGPS ACTIVE RESET ANTENNA SUPPLY ON OFF FLASH PROGRAMMING MODE ON OFF DISC IP2 DISC 101 DISC 102 DISC IP3 SETUP Refer to the installation procedure to install the GPS Monitor software For normal oper
71. Mark won t be aligned and the TTFF is according to the specification With respect to Figure 2 6 Tb is 1 01 ms 0 01 ms and occurs once each second approximately 999 999ms receiver clock drift with the rising edge 0 to 1 transition corresponding to the receiver epoch 1 Hz In 2 Hz PVT mode the Time Mark will be output once per second In Time Alignment mode the Time Mark will be synchronized to the Seconds boundary of the GPS Time The Time Mark Output can also be configured as a standard discrete output fully controlled by the software for customized versions See Appendix C for the electrical characteristics Page 2 13 Revision B July 9 2001 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION lt Tb lt 1 PPS G704083cdr Figure 2 7 Time Mark Waveform The timing relationship for the GPS Time Mark output from the receiver is defined in Figure 2 8 The Navigation Data message ID 20 defines the UTC time of the epoch The rising edge of the Time Mark is accurate to within 1 usec of UTC 1 1 1 i TIME MARK i USER 1 f i i i LAT LONG i 1 ALT i ee i NS EW VEL VALID 4 VERT SPD i OUTPUT UTC NAV SELON COMPUTATION TIME USER TIME EPOCH GPS SOLUTION VALID G704084cdr Figure 2 8 GPS Timing Relationships Page 2 14 April 17 2000 CMAC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION
72. QUIRED ener ee eine ee ee a 3 1 ELECTROSTATIC DISCHARGE 565 2 22 3 1 EQUIPMENT 4 0 0 8 00 3 1 INSTALLATION 3 1 ANTENNA 3 1 B BASE STATION EOGATIQON nter 3 2 oen eo eod eset tea AREAS ERA e Rie Sn 3 2 D BASE STATION AND ROVING UNITS SEPARATION 3 2 Page TC i April 17 2000 SECTION CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION TABLE OF CONTENTS CONT D PAGE INSTALLATION AND VERIFICATION Cont d CHOICE OF A WIRELESS DGPS DATA LINK 2 2 3 2 RANGE EE 3 3 B ONE WAY VS TWO WAY LINK esses nnns 3 4 C LATENCY AND RATE OF DATA TRANSMISSION 3 4 D THE RADIO FREQUENCY 0 nnns 3 4 E FREQUENCY SELEGTOR 4 isin Fu d eo nn ae a aa nn nna 3 4 INTERFERENCE 3 4 NETWORK CAPABILITY utn oen tate nnd te n Lane ea ve hae Dann aha 3 5 WIRELESS DGPS LINK 6
73. S receiver Since all GPS satellites must transmit on the same frequency they are distinguished by their pseudo random noise codes Parallel receiver a receiver that monitors four or more satellites simultaneously with independent channels Precise Positioning Service PPS the GPS positioning velocity and time service which will be available on a continuous worldwide basis to users authorized by the U S Department of Defense typically using GOT 4 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION Pseudolite an Earth based transmitter designed to mimic a satellite May be used to transmit differential corrections Pseudorange the calculated range from the GPS receiver to the satellite determined by taking the difference between the measured satellite transmit time and the receiver time of measurement and multiplying by the speed of light This measurement generally contains a large receiver clock offset error Receiver channels a GPS receiver specification which indicates the number of independent hardware signal processing channels included in the receiver design Relative bearing bearing relative to heading or to the vessel Residual in the context of measurements the residual is the misclosure between the calculated measurements using the position solution and actual measurements Route a planned course of travel usually composed of more than one navigation leg
74. Satellite elevation the angle of the satellite above the horizon Selected waypoint the waypoint currently selected to be the point toward which the vessel is travelling Also called to waypoint destination or destination waypoint Selective Availability SA the method used by the United States Department of Defense to control access to the full accuracy achievable by civilian GPS equipment generally by introducing timing and ephemeris errors Sequential receiver a GPS receiver in which the number of satellite signals to be tracked exceeds the number of available hardware channels Sequential receivers periodically reassign hardware channels to particular satellite signals in a predetermined sequence Spherical Error Probable SEP the radius of a sphere centered at the user s true location that contains 50 percent of the individual three dimensional position measurements made using a particular navigation system Spheroid sometimes known as ellipsoid a perfect mathematical figure which very closely approximates the geoid Used as a surface of reference for geodetic surveys The geoid affected by local gravity disturbances is irregular Standard Positioning Service SPS a positioning service made available by the United States Department of Defense which will be available to all GPS civilian users on a continuous worldwide basis typically using C A code SV Space Vehicle ID sometimes used as SVID also used
75. TATION 575 104 T MAGNET NM NO MAGNET INTERNAL RM EMOVABLE HD HEAVY DUTY L 2 db 0 2 db 20 6 db 35 mA 6 db 50 OTHER VOLTAGE 00 XX OTHER 575 1040 000 05 26 RIGHT ANGLE CONNECTOR ADD R TO CONNECTOR NOTATION THIS OPTION AVAILABLE FOR CABLED ANTENNAS ONLY 1 5 8 LOCK WASHER AND NUT SUPPLIED INSTALLATION TORQUE 5 FT LB MAX NOTES UNLESS OTHERWISE SPECIFIED SPECIFICA FREQUENCY POLARIZATION AXIAL RATIO RADIATION COVERAGE AMPLIFIER GAIN NOISE FIGURE IMPEDANCE VSWR BAND REJECTION POWER HANDLING FINISH CONNECTOR WEIGHT ALTITUDE TEMPERATURE DESIGNED TO CMC PART Outline Drawing GPS Antenna 1575 MHz AT575 104 Rev PHASE CENTER 1 30 1 35 ere 51 O RING 2 034 9804050 Tas ADAPTER 4 40 UNC M PHILLIPS SCREW 5 5 CONNECTOR ASSEMBLY REF ONLY 1 14 UNS REF ONLY 575 68 DRAB CONNECTOR TNCM MALE TNCF TNC FEMALE BNCM BNC MALE BNCF BNC FEMALE MCXM MCX MALE MCX FEMALE SMAM SMA MALE SMAF SMA FEMALE NTPM TYPE MALE NTPF TYPE FEMALE 0000 NO TERMINATION CABLE LENGTH
76. TYPE Vil Vih Vol Voh Input Rise amp max min max min Fall Time Volt Volt Volt Volt uSEC Power Control Input note1 0 50 2 00 lt 1 Disc_IP_1 Disc_IP_2 0 7 2 3 lt 1 Disc IP 3 DISC IO 1 Rx No 1 Rx No 2 Rx No 3 0 8 2 1 2 0 4 0 8 VDD 0 1 Timemark Output 1PPS 0 lt 200 DISC_IO_1 Tx 3 0 4 2 4 Note 1 ALO pulse of 150ns minimum will invoke a master reset to the receiver Note 2 Conditions 5V 5 for all limits Figure C 2 I O Signals Voltage Limits Page C 2 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX D ANTENNA SPECIFICATIONS CONTENTS Subject Page GABLE SELECTION 5 ane ea en ete eee tie D 1 GEODETIC ACTIVE ANTENNA c seseccsccsecdoveca stows D 3 ACTIVE ANTENNA D 4 PASSIVE 22 ton ea aranera b acuit amen pa NER E oa taei Tearen lr D 4 Page D i April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page D ii Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX D ANTENNA SPECIFICATIONS The GPS antenna is an important part of the total system performance and should be selected depending of your application All the GPS receivers designed and manuf
77. X X X PROG PI 1 1 3 6 prse 249 DISC LP Se PIS dm 6 2 3 5 e x DISC OP 2 18 3 4 VBA Pl 22 avi TIME MARK PI 5 2 7 HAN VA 2 160 729 VAR SEE SEPARATE PARTS LIST THIRD ANGLE PROJECTION CMC REF ONLY MATERIAL CONTRACT gt CANADIA MARCON COMPANY UNLESS OTHERWISE SPECIFIED DIMENSIONS CONTRACTOR amp 44 MONTREAL QUEBEC CANADA APPLY AFTER FINISHING AND ARE IN PRAWN DATE YR MO DYO ANGULAR INCHES MILLIMETERS D C 38 02 09 CABLE TOLERANCE TOLERANCES TOLERANCE Tul XXX XXX XX FINISH DRAWING APPROVAL SIZE CAGE CODE DWG NO aj n 77 NEXT ASSY USED ON 9007 211 601 725 VAR APPLICATIONS DRAWING SCALE SHEET 4 3 2 TE Page B 5 B 6 Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX C EXTERNAL INTERFACE CHARACTERISTICS CONTENTS Subject Page CONNECTOR PIN ASSIGNMENT c cccssssssssssesssscssssssesssscscseseeseeseacssacsceseacseeacaeeeeaeacsesaeseeeansseaseeeeeataceaes C 1 VO ELECTRICAL CHARACTERISTICS cinta tert cnoser tese ate ponant tue Don RO camo apache C 2 Page C i April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX C EXTERNAL INTERFACE CHARACTERISTICS CONNECTOR PIN ASSIGNMENT Fi
78. actured by CMC in the GPS OEM include an Low Noise Amplifier LNA before the the RF ASIC This 20dB LNA permit raisonnable performances with a passive GPS antenna But depending of the cable loss between the antenna element and the GPS receiver and also the position accuracy requirements then a 12dB up to 36dB Active GPS Antenna could be needed This appendix is divided in characteristics for high end Active Geodetic Antenna including Choke Ring Antenna then lower cost Active Antenna and then Passive Antenna CMC does not manufacture GPS Antenna but because of the high volume consume by our subsiadary the GPS OEM group is able to offer on the re sell market very good antenna at a very competitive price There are many GPS suppliers around the world CMC tried most of them and selected AeroAntenna Technologies Inc as one reputable source of its antenne supply This is not to say that any other GPS Antenna supplier will not perform well with our receivers It is the user responsability to select the GPS Antenna which best full fill its requirements CMC is also able to offer the coax cables required between the GPS Antenna and the our Receiver You will also find in this section different coax cables required in your GPS system The end of this section includes very detailed Antenna drawings CABLE SELECTION The interconnection cable between the GPS Antenna and the Receiver is of prime importance for the proper performance of the system Three
79. age Temperature 55 C to 100 C Version without battery Temperature Variation 4 C per minute Humidity Relative Humidity up to 95 non condensing Altitude 1 000 feet to 60 000 feet 18 000 m Vibration operational See SAE curve Figure 2 5 Shock 20g peak 5 milliseconds duration 3 axes Dynamics Velocity 514 m s Acceleration 4g Jerk 2 m s Figure 2 4 Environmental Categories Sinewave 2 foot p p displacement 1 6 Hz 2 828 G peak accelaration 2000 Hz 10 10 10 10 104 VIBRATION FREQUENCY Hz G704082CDR RANDOM VIBRATION OVERALL ACCELERATION 3 GRMS SAE COMPOSITE CURVE RANDOM NOISE Figure 2 5 SAE Composite Curve Random Vibration Page 2 7 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION DESIGN AND CONSTRUCTION A Materials Processes and Parts The selection of parts and materials is based on commercial parts suitable for automotive and airborne applications Standard parts and materials are procured to suppliers catalog number All parts and materials are subject to CMC incoming inspection for conformance to requirements Non standard parts are also subject to CMC incoming inspection and documented on a CMC Source Control Drawing which include as a minimum the following Electrical and mechanical characteristics Environmental and Quality Assurance requirements Workmanship requirements e e Marking requirements Manufacturing processes
80. anosecond 1 x 10 second Nautical mile any of various units of distance for sea and air navigation in the U S since 1959 an international unit of linear measure equal to 1 minute of arc of a great circle of the Earth 1 852 metres 6 076 feet Null field by NMEA standard indicates that data is not available for the field Indicated by two ASCII commas i e HEX 2C2C or for the last data field in a sentence one comma followed by either the checksum delimiter 2A or the sentence delimiters lt CR gt lt LF gt HEX ODOA Note the ASCII Null character HEX 00 is not to be used for null fields Obscuration term used to describe periods of time when a GPS receiver s line of sight to GPS satellites is blocked by natural or man made objects Origin waypoint the starting point of the present navigation leg expressed in latitude and longitude P Code precise or protected a spread spectrum direct sequence code that is used primarily by military GPS receivers to determine the range to the transmitting GPS satellite Uses a chipping rate of 10 23 MHz PDOP Position Dilution of Precision A numerical value expressing the confidence factor of the position solution based on current satellite geometry 3D position latitude longitude height is unknown The lower the PDOP value the greater the confidence factor PRN Pseudo Random Noise number the identify of the GPS satellites as determined by a GP
81. aracters is fixed For data fields such fields are shown in the sentence definitions with no decimal point Other fields which fall into this category are the address field and the checksum field if present Flash ROM Programmable read only memory GDOP Geometric Dilution of Precision A numerical value expressing the confidence factor of the position solution based on current satellite geometry Assumes that 3D position latitude longitude height and receiver clock offset time are variables in the solution The lower the GDOP value the greater the confidence in the solution Geodetic datum the reference ellipsoid surface that defines the coordinate system Geoid the figure of the earth considered as a sea level surface extended continuously through the continents The actual geoid is an equipotential surface coincident with mean sea level to which at every point the plumb line direction in which gravity acts is perpendicular Geostationary a satellite orbit along the equator that results in a constant fixed position over a particular reference point on the earth s surface GPS satellites are not geostationary Global Positioning System GPS full name NAVSTAR Global Positioning System a space based radio positioning system which provides suitably equipped users with accurate position velocity and time data When fully operational GPS will provide this data free of direct user charge worldwide continuously and unde
82. ation of the Development Kit DIP switches S1 must be set as follows S1 1 to S1 5 setto OFF S1 6 to S1 8 setto ON and the reset push button must be not be pressed in Connect the Development Kit serial port PORT1 to an IBM compatible computer PC serial port Page A 2 April 17 2000 CMAC electrenics USERS MANUAL ALLSTAR DGPS BASE STATION Connect the Development Kit serial port PORT2 to RTCM SC 104 DGPS correction receiver if available Connect the GPS Antenna to the HF N BNC connector Connect the power supply to the rear panel 9 16 VDC input jack P N 100 60026 Sonn PRIMARY DGPS 2 OUTPUT 2 OUTPUT 3 INPUT 3 INPUT 5 GROUND 5 GROUND TIME MARK RETURN 2 TIME MARK OUTPUT 1 The POWER indicator should be ON Launch the GPS Monitor software application By default the GPS Monitor software is configured to serial port COM1 at 9600 BPS Your installation may require the selection of another communication port The ALLSTAR communication baud rate is 9600 BPS except for the Carrier Phase Output option that requires 19200 BPS Page A 3 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION DIP SWITCHES The I O discretes of the GPS receiver can be driven HI or LO using switches S1 1 to S1 5 For normal operation S1 1 to S1 5 must be set to OFF Switch Function Description 51 1 3
83. ave been extensively used for DGPS applications Features include Multiple channel selector switch High receiver sensitivity Built in preselector for image interference rejection Powerful AX 25 and MX 25 protocol for repeating or network coverage High speed 9600 bps operation Fast turnaround time for Tracking and AVL Rugged water resistant packaging 5 W and 25 W transmitters Page 3 5 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION GLB Products All configurations are available with single or multiple frequency selector Complete kits are available with Antennas and RF data cabling 150 MHz and 450 MHz frequency bands are available from stock Other frequencies in the 125 MHz to 960 MHz band are available on request Typical 450 MHz configurations are 450 MHz TX only 5 W SN2TX96 450 5 450 MHz RX only SN2RX96 450 450 MHz 25 W TX only SN2TR96 450 25 450 MHz TX only 25 W Ruggedized Enclosure BASE8 450 25 450 MHz TX RX 5 W SN2TR 450 5 Please contact GLB for Plug and Play Packages that include antennas and RF data cables GLB Electronics Sales 905 878 7794 Technical 716 675 6740 http www glb com Page 3 6 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION IV OPERATION CONTENTS Subject Page PREGEIV ERS TA TES 4 1 NON OPERATIONAL STATES e ortis dete
84. bility and maintainability of the assembly The MTBF calculation uses to the maximum extent possible models derived from past experience service and test which also account for failures due to causes other than piece parts When such data is not available the analysis procedure of MIL HDBK 217F is used assuming a 40 C ambient temperature inside the host unit ENVIRONMENTAL AND EMC REQUIREMENTS The receiver operates within the performance requirements specified herein during and or after exposure to the following environmental and electrical conditions The receiver meets all specified requirements and provides performance and reliability under any natural combination of the service conditions outlined in Figure 2 3 It shall be understood that in normal operation the environmental and EMC tests shall be performed with the receiver installed within the host unit When in a unit the following environmental requirements of Figure 2 3 shall be met Page 2 6 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION The basic version of the receiver dissipates 1 2W typical The receiver relies on convection and radiation for heat dissipation If the host unit s internal temperature is greater than the maximum operating temperature thermal management shall provide for heat sinking of the RF shield to the host unit chassis Operating Temperature 30 C to 75 C Optional 40 C to 85 C Stor
85. blocks where the message block header defines the contents and size of all message blocks bearing this ID For discussion purpose the transmitter is the controlling Host CPU and the GPS receiver is the Receiver Prior to entering the protocol both the transmitter and receiver must be set up to the same baud rate and data setting Upon entering the protocol the transmitter and receiver wait for the possible transmission of message blocks A PHYSICAL LINK LAYER The electrical signals used are those for RS 232 communication port Only the Receive and Transmit lines are required The serial port is asynchronous and should be set up with 1 start bit 8 data bits no parity bit and one stop bit A default baud rate of 9600 is used Both transmitter and receiver are operating at the same rate and can be reprogrammed see msg ID 110 B DATA LINK LAYER 1 Bit Ordering The ordering of data within message blocks is such that the least significant bit LSB is the first bit received moreover the most significant bit MSB is the last bit in the sequence MSB LSB Order 76543210 This ordering is applied to all data formats which include integer values fixed point values floating point values and character strings Message Block Structure All communication is done using message blocks Each message block consists of a header and possibly data The data portion of the block is of variable length depending on the message ID Th
86. cal characteristics Page 2 12 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION a DISC_IP_1 The discrete input Discrete 1 is used to control the reprogramming of the Operational software Refer to Appendix F for details on the programming mode procedure b DISC IP 2 DISC IP and DISC IO 1 These 2 discrete inputs and the configurable discrete I O signal are general purpose default condition inputs DISC IO 1 can be configured as a discrete output signal for custom applications Note Not all signals are available depending on the type of connector selected see Appendix C TIME MARK OUTPUT 1 PPS The Time Mark discrete output interface is implemented using a standard TTL Logic output type Clamping diodes are provided to Vcc and Ground and the output is current limited using a series resistor The time mark is a 1 Hz signal with its rising edge corresponding to the time when the navigation outputs are valid see Figure 2 6 for Time Mark waveform The Time Mark Output has 2 operating modes Aligned on GPS Time or Free Running In Aligned on GPS Time mode the Time Mark Output and GPS measurements will be aligned on GPS time at 200ns typically With respect to Figure 2 7 Tb is 1 01 s 0 01 ms To allow the synchronization on GPS Time a maximum delay of 5 seconds can be added to the TTFF See CMC Binary message ID 20 and 103 for more information In Free Running mode the Time
87. ce of the DC power on the SRAM will determine which of the two non operating modes will be automatically entered during the power down sequence 1 OFF Mode In OFF mode only the data contained in the NVM is retained for use when power is re applied Refer to the NVM Data section details on retained data SRAM Keep Alive Mode In SRAM Keep Alive mode specific data contained in the SRAM is retained to reduce the time to first fix when power is re applied Data retained in SRAM mainly consists of valid satellite ephemeris data not older than 3 hours B OPERATIONAL STATES 1 The receiver has 6 operating modes Self Test Initialization Acquisition Navigation Dead Reckoning and Fault The receiver switches between modes automatically as shown in Figure 4 1 The receiver reports on its host port the current operating and navigation modes Self Test Mode The receiver enters Self Test mode upon request from an external source CMC Binary message ID 51 The time duration spent in the Self Test mode is no more than 15 seconds On self test completion the receiver reports the BIT results on its host port through the CMC Binary message ID 51 Self Test mode exits to either Initialization or Fault mode Initialization Mode Upon power up the receiver enters Initialization mode During this mode hardware is initialized prior to Acquisition mode entry The Initialization mode is also initiated upon completion of the Self Test mode but
88. ch could be used with any of the CMC GPS receivers Typical Applications CMC Part Numbers Supplier Part Numbers The lowest cost available for AVL 201 990147 433 TNC Female Bulk head AT575 97CA Table D 7 Recommended Passive Antennae Page D 5 Revision B July 9 2001 cmc electrenics GPS Pre Amplifier Antenna AT575 19 Rev E 1 660 ANIVd LON 6 32UNC 2A X 3 4 CROSS RECESSED FLAT HEAD 5 5 303 2 000 3 44 TN NAMEPLATE 9804046 a er FEMALE NITRILE O RING 575 5 TYPE ANTENNA USER S MANUAL ALLSTAR DGPS BASE STATION 575 19 TYPE ANTENNA 4X 9 140 THRU 82 C SINK X 9 280 AT575 32X XXX XXX XX XX XX COLOR 1 T MAGNET W WHITE NM S SMOKE GRAY O OLIVE DRAB HEAW DUTY CONNECTOR TNC MALE GAIN i 2 db TNCF TNC FEMALE 12 12 db 20 mA MALE E 26 26 db 35 mA BNCF BNC FEMALE z 36 36 db 50 MCXM MCX MCXF MCX FEMALE 5i SMA MALE VOLTAGE SMAF SMA FEMALE 00 PASSIVE TYPE MALE 05 5 VDC NIPF TYPE FEMALE RG 5 18 VDC 0000 NO TERMINATION XX OTHER CABLE LENGTH 000 IN INCHES OPTION NOT AVAILABLE WITH THIS MODEL STANDARD MODEL
89. cien RO Rae teo use tue aestate otis 2 8 D INTERGHANGEABIEITW5 ud 2 9 HARDWARE INTERFACE 2 eec ense totem 2 9 A CONNECTORS AND CONNECTOR PINS ASSIGNMENT 2 9 metiendo ede sudes aA E 2 11 TIME MARK DUTPUT occi 2 13 2 15 e eoi etu 2 15 BEAUDODIAB Y PEOR T ctae ix ees E lese tuc E 2 15 NON VOLATILE MEMORY DATA eren tn ennt anaran Dash sns n sss sp sna 2 15 Page 2 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page 2 ii Revision Sept 2000 cme electrenics SE USER S MANUAL ALLSTAR DGPS BASE STATION CTION Il RECEIVER SPECIFICATIONS NAVIGATION PERFORMANCE The position and velocity outputs meet the accuracies defined in Figure 2 1 under the dynamic conditions of 500 m s and linear acceleration of up to 4 0g Specified accuracies are achieved with a 95 probability NAVIGATION SA INACTIVE SA ACTIVE DGPS RTK ACCURACIES Receiv
90. ckwise through 360 Strictly the term applies to direction through the air or water not the direction intended to be made good over the ground see track Differs from heading Cycle slip an error in the continuous count of carrier phase cycles Dead Reckoning DR the process of determining a vessel s approximate position by applying from its last known position a vector or a series of consecutive vectors representing the run that has since been made using only the courses being steered and the distance run as determined by log engine rpm or calculations from speed measurements Destination the immediate geographic point of interest to which a vessel is navigating It may be the next waypoint along a route of waypoints or the final destination of a voyage Differential GPS DGPS a technique to improve GPS accuracy that uses pseudorange errors measured at a known location to improve the measurements made by other GPS receivers within the same general geographic area Dilution of Precision DOP A numerical value expressing the confidence factor of the position solution based on current satellite geometry The lower the value the greater the confidence in the solution DOP can be expressed in the following forms GDOP all parameters are uncertain latitude longitude height clock offset PDOP parameters are uncertain latitude longitude height HTDOP 2D parameters and time are uncertain latitude longitude
91. e header has a fixed length of 4 bytes consisting of a Start of Header character SOH Block ID Block ID Complement and Message Data length Each block has a truncated 16 bit word containing the Checksum associated with the complete content of the block It is appended at the end of the Data portion of the block The Message Block structure is as follows byte 1 SOH byte 2 ID byte 3 Cmpl ID Page 5 1 April 17 2000 CMAC electrenics USERS MANUAL ALLSTAR DGPS BASE STATION byte 4 Msg Data Length byte 5 Data Word 1 LSB byte 6 Data Word 1 MSB Checksum LSB Checksum MSB where SOH Start of header character decimal 1 ID Byte containing the Block ID numeric value The block ID number field is used uniquely to identify the format of the data portion of the block Since only 7 bits are needed for the ID the higher bit is used to encode information about start stop of broadcast of data blocks and to set special modes for command messages This prevents an unnecessary increase in overhead by eliminating any extra bytes in the protocol Cmpl ID 1 s complement of the ID field This can be calculated as Cmpl Block 255 Block or using XOR as Cmpl Block Block 4 XOR 255 This field in conjunc tion with the Start Of Header helps to synchronize the message blocks since the SOH character can appear within the data the Cmpl Block field validates the header contents and thus confirms the start
92. eenens 2 2 PHYSICAL 2 4 A OUTLINE AND FORM 2 4 B PACKAGING 2 6 RELIABILITY 2 6 ENVIRONMENTAL AND EMC nnmnnn ennn 2 6 DESIGN AND 4 2 8 A MATERIALS PROCESSES AND 2 8 B EQUIPMENT 5 2 8 C BUILT IN TEST BIT 20 0 2 8 D INTERCHANGEABILEITY 2 rtt tet diet etia tet te cine e 2 9 HARDWARE INTERFACE 2 2 2 9 A CONNECTORS AND CONNECTOR PINS 98 0 2 9 POWER INPUT niiees cates a a A eldest es 2 11 TIME MARK OUTPUT 1 PPS iile ILE e roce eta cael ick 2 13 SERIAL DATA INTERFACE 40 2 15 A PRIMARY PORL iit eruta cus soo eR OB PER ARR n3 e cate dexaes Ee Y ARX SR 2 15 Bs AUXILIARY PORT uitis fena ien e ea eo eu tee nnn ee 2 15 NON VOLATILE MEMORY 2 15 INSTALLATION AND 3 1 EQUIPMENT RE
93. ency is affected by the data rate at the serial ports of all the equipment in the link as well as the over the air data rate The higher the data rates the lower the latency or age of DGPS corrections The higher the data rate the higher the number of updates or DGPS corrections per second The Radio Frequency Used The radio frequency can have some effect on the link results Low frequencies tend to propagate better over terrain and higher frequencies tend to be more line of sight For a given amount of antenna gain higher frequency antennas are smaller in direct proportion to the frequency difference The higher gain antennas also tend to be less expensive at higher frequencies due to their smaller size It should be noted that at the higher frequencies above 400 MHz transmission line loss must be considered A run of 50 feet using an inappropriate cable can easily lead to a loss of half of your transmit power or more The same applies to the receive side of the link in terms of loss of effective receiver sensitivity Frequency Selector Many DGPS links in North America are operated on a small group of itinerant frequencies These frequencies can become congested in urban areas Most radios are synthesized and can be programmed to operate at a specific frequency or set of frequencies if equipped with a selector switch Having the selector switch under field conditions can greatly simplify changing frequencies in the case of interference from
94. enuating one or both of the offending signals Close in frequencies simply require a good IM performance specification Look for an IM specification in excess of 60 dB Adjacent channel interference typically occurs when there is a strong signal in the next adjacent channel and you are near the limit of range of your system Look for specifications in excess of 65 dB Network Capability In some cases a DGPS reference station with single transmitter cannot cover enough area without the logistical difficulty of frequently moving the station A wider area can be covered using a singe reference station with multiple transmitters The Network uses the first transmitter to send the DGPS correction and it is in turn repeated by one or more distant transmitters To set up a DGPS network with several repeaters requires the wireless link to have a network protocol capability Protocols such as AX 25 or the more powerful MX 25 support powerful features such as multi hop digipeting digital repeating and time slotted digipeting Systems have been set up that cover more than 30 000 square miles using a single DGPS reference station Systems can even include mobile marine or airborne repeaters without a degradation of DGPS accuracy Wireless DGPS Link Options CMC is teamed with GLB for many of their DGPS link products They have been used extensively in the field with our products and have proven to be reliable and efficient GLB offers wireless links that h
95. er Performance 2 SIGMA 95 Horizontal Position 30 meters 100 meters 2 meters 0 2 meters Ground Speed 0 13 m s 0 3 m s 0 05 m s 0 05 m s Track Angle True 1 0 deg 3 0 deg 0 1 deg 0 1 deg Vertical Speed 0 16 m s 0 6 m s 0 1 m s 0 1 m s Altitude 40 meters 160 meters 5 meters 0 2 meters N S Velocity 0 1088 m s 0 21 m s 0 035 m s 0 035 m s E W Velocity 0 1088 m s 0 21 m s 0 035 m s 0 035 m s Time 1 usec 1 usec 1 usec 1 usec See p 10 of document 1826 1127 Rev K Figure 2 1 Position and Velocity Outputs The accuracies are met for the following conditions HDOP 1 5 VDOP 2 0 TDOP 0 8 A FIGURE OF MERIT The receiver provides an estimated accuracy level The accuracy level estimate is provided in the horizontal and vertical Figure of Merit FOM The FOM reflects a 95 confidence level for the position solution accuracy estimate The FOM accounts for all major sources of errors in the pseudo ranges of the satellites used in the position solution The error sources which are included are selective availability ionospheric and tropospheric errors satellite position errors based on transmitted user range error and thermal noise Page 2 1 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION B TIME TO FIRST FIX TTFF The receiver shall enter Navigation mode and provide valid outputs in less than 50 seconds 95 after completion of the self test and all o
96. f the 7 SV as per SV1 as per SV1 41 45 Satellite visibility data of the 8 SV as per SV1 as per SV1 46 50 Satellite visibility data of the 9 SV as per SV1 as per SV1 51 55 Satellite visibility data of the 10 SV as per SV1 as per SV1 56 60 Satellite visibility data of the 11 SV as per SV1 as per SV1 61 65 Satellite visibility data of the 12 SV as per SV1 as per SV1 45 5 18 Operational S W Part number XXX N A char 14 Software Identification XXXXXX XXX Information 19 36 Reserved ASCII string char 18 37 50 Boot S W Part number N A char 14 51 90 Reserved N A N A 91 94 Boot Checksum N A N A 95 98 Operational Checksum N A N A 99 Reserved N A N A 47 This message is output once per second N A N A Base Station Status upon reception of a message ID 47 request 5 BaseStatus N A N A bits 0 1 Base Status 0 Not in Base 1 Position Not Initialized 2 Base Initialized 3 Reserved bits 2 4 Baud Rate 0 300 1 600 2 1200 3 2400 4 4800 5 9600 6 19200 7 38400 bits 5 7 Reserved 6 13 Time Remaining Survey hours double 14 17 Base Station Position CEP meters float 18 25 Base Station Position Latitude radians double 26 33 Base Station Position Longitude radians double 34 41 Base Station Position Height meters double 42 45 Reserved N A N A 46 Number of Differential Message N A byte bit 0 4 Number of Differential Message bit 5 8 Re
97. f the following initialization criteria being met 1 Valid time 10 minutes and position data 100 km from actual position 2 Valid almanac data less than one year old 3 Elevation of at least 4 satellites greater than 5 above horizon 4 HDOP lt 6 The time allowed for self test and device initialization is less than 5 seconds In the case where the following additional conditions are met the TTFF is reduced to less than 30 seconds 95 5 The unit was in SRAM Keep Alive mode before nominal power was re applied 6 The last navigation fix occurred within the last 2 hours 7 Valid ephemeris data age of less than 4 hours for at least 5 satellites With no initialization the time from power application to valid navigation output is less than 3 minutes typically less than 10 minutes 95 RECEIVER PERFORMANCE The receiver meets the performance requirements defined below under conditions of vehicle operating speeds of up to 514 m s limited by Canadian amp US Export Laws acceleration of up to 4 0g jerk of up to 2 m s specified temperature range as specified herein and minimum carrier to noise ratios as specified herein 1 GPS Signals The receiver is meant to operate using the L1 GPS signal as described in Reference 1 2 Reacquisition Reacquisition is defined as resumption of tracking and measurement processing There is no disruption of navigation data output when a satellite signal is lost for reas
98. ght Angle Shrouded Header with detent windows 1 example of manufacturer s part number connector and mating Connector 102570 8 Mating 87835 4 NOTE Internal row contains the odd pin number 1 19 External row contains the even pin number 2 20 B Power Input The receiver shall operate from regulated DC power supplies as specified in Figure 2 6 PIN FUNCTION VOLTAGE STANDBY ACTIVE ACTIVE RIPPLE NO NOTE 1 CURRENT CURRENT CURRENT MAX TYP TYP MAX NOTE 2 mA mA mA NOTE 4 J1 21 5V Digital 5V 18 70 130 100 mV 10 5 J1 26 5V RF BV 45 15 75 110 50 mV Note 1 J1 15 VDD Note 3 0 180 90 170 100 10 5 VDD 26 0 030 Note 5 Note 1 To avoid CMOS latch up condition the maximum AV including ripple between the 5V Digital 5V RF and VDD shall be lt 0 5 V 2 Ripple specification is defined for frequencies up to 100 kHz Figure 2 6 Power Input Sheet 1 of 2 Page 2 11 April 17 2000 3 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION If the application doesn t request the SRAM Keep Alive Mode see para 3 1 1 this pin must be connected to J1 21 5V Digital Typically the data will stay valid for VDD down to 2 6V but it is not guaranteed for all variations when VDD lt 4 5Volts Only for variations contact CMC for more information having Low voltage data retention SRAM the data will be keep valid down to 2 6Volts The ti
99. gure C 1 shows the Interface and Power connector J1 or J3 depending of OEM variation pin assignment J1 J3 SIGNAL NAME COMMENTS PIN PIN 1 Reserved 2 Disc_IP_3 Note 4 3 Reserved 4 1 Reserved 5 3 Power Control Input Note 4 6 4 Rx_No_3 Optional Port 7 5 Time Mark 1 PPS Output 8 Ground 9 6 Disc_IP_1 Note 2 3 5 10 2 Tx No 3 Optional port 11 7 Rx No 2 Auxiliary port Note 4 12 9 Ground 13 8 Tx No 2 Auxiliary port 14 10 Disc IP 2 4 15 11 VDD 16 Ground 17 12 Rx No 1 Primary port Note 5 18 13 Ground 19 14 Tx No 1 Primary port 20 15 Reserved 21 17 5V Digital 22 Ground 23 16 Preamp Active Antenna supply 24 18 Ground 25 20 Disc 1 Note 5 26 19 5V RF Figure C 1 J1 and J3 Interfaces and Power Connector Pin Assignment Note 1 Not used Note 2 For normal operation the pin should be tied to GND preferred option or left open Note 3 The pin has been reserved for the reprogramming mode see Appendix G Note 4 On board pull up resistor Note 5 On board pull down resistor Note 6 Reserved pins shall be left unconnected Page C 1 April 17 2000 cme electrenics ELECTRICAL CHARACTERISTICS USER S MANUAL ALLSTAR DGPS BASE STATION Figure C 2 shows the voltage level limits for all different I O signals SIGNAL NAME
100. hat houses the GPS receiver and a power supply Communication with the receiver is performed via a DB 25 connector Figure B 1 depicts the interconnection required for the STARBOX 4 23 in 3 33 in 107 4 mm 84 6 mm 3 77 in 95 8 mm Figure B 1 Outline Drawing DESCRIPTION The pinout of the DB 25 connector is as follows Page B 1 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION DB 25 PIN STAR BOX DESCRIPTION 1 DISC IP 1 OPEN GND CMOS discrete input with 10K pull up resistor Note 3 2 GND Ground Connection 3 DISC IP 2 OPEN GND CMOS discrete input with 10K pull up resistor Note 3 4 RESERVED 5 TIMEMARK 1 1 Pulse Per Second Output TTL level with a 100 series resistor 6 Serial Intf TX 1 Main Serial Interface Port Transmitter Note 1 7 Serial Intf RX 1 Main Serial Interface Port Receiver Note 2 8 GND 9 RESERVED 10 RESERVED 11 TEST CMOS discrete input with 10KQ pull up resistor Force the Reprogramming Mode at power up if connected to Ground Shall be left OPEN for normal operation 12 RESERVED 13 GND 14 RESERVED 15 RESERVED 16 DISC OP 1 CMOS discrete output with 100 series resistor 17 RESERVED 18 TIMEMARK_2 OPEN DRAIN output with a 10KQ pull up resistor 500ma maximum 19 GND 20 Serial Intf TX 2 Auxiliary Serial Interface Port Transmitter Note 1 21 Serial Intf RX 2 A
101. head Heading is a constantly changing value as the vessel oscillates or yaws across the course due to the effects of the air or sea cross currents and steering errors L1 frequency the 1575 42 MHz GPS carrier frequency which contains the coarse acquisition C A code as well as encrypted P code and navigation messages used by commercial GPS receivers L2 frequency a secondary GPS carrier containing only encrypted P code used primarily to calculate signal delays caused by the ionosphere The L2 frequency is 1227 60 MHz Page GOT 3 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION Magnetic bearing bearing relative to magnetic north compass bearing corrected for deviation Magnetic heading heading relative to magnetic north Magnetic variation the angle between the magnetic and geographic meridians at any place expressed in degrees and minutes east or west to indicate the direction of magnetic north from true north Mask angle the minimum GPS satellite elevation angle permitted by a particular GPS receiver design Satellites below this angle will not be used in position solution Measurement error variance the square of the standard deviation of a measurement quantity The standard deviation is representative of the error typically expected in a measured value of that quantity Multipath errors GPS positioning errors caused by the interaction of the GPS satellite signal and its reflections N
102. ight The range in miles is given by Range v 2 H 2 where H is the height of the transmit antenna in feet and is the height of the receive antenna in feet Given 8 feet height for the receive antenna and 25 feet height for the transmit antenna the range is 11 miles Note that if the transmit antenna or receive antenna are on hilltops the height of the hill above the highest terrain between TX and RX should be included in the height of the antenna Terrain Terrain is the greatest contributor to short range lt 100 miles communication Terrain includes the shadowing or blocking effect of hills and valleys as well as buildings and foliage Dense foliage can easily shorten a smooth earth range calculation of 10 miles to 2 or 3 miles Foliage can often be overcome by brute RF transmit power or excellent receiver sensitivity Transmit Power and Receive Sensitivity Transmit power and receiver sensitivity can be traded off against each other in cases where you are not competing with another user on the same frequency Having a receiver sensitivity of say 6 dB better than a competing receiver makes your transmitter look 6 dB 4x more powerful This translates to more range and a more reliable link Alternately having a sensitive receiver can significantly lower the cost of the transmitter by allowing a lower power model Having a lower power transmitter can increase battery life or reduce battery weight in portable applications
103. ill send one of these commands to force the programming mode thus avoiding the need to the DISC IP 1 pin to 5 volts It is useful when the system does not provide external access to the DISC_IP_1 pin Page F 1 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION HOW TO VERIFY IF INPROGRAMMING MODE OR NOT Once in programming mode the receiver sends the following information to both communication ports Ready WWWWW Character w means waiting for data exchange and will be repeated until the programming utility starts to send data The baud rate will be 19200 if the programming mode setting is done by hardware and any other baud rate if done through operational software command WHICH PORT TO USE The MAIN port or the AUXILIARY port can be used to program the receiver It is recommended to stop any communication on the unused port for proper operation in programming mode PROGRAMMING UTILITY The programming utility PROG EXE is used to a Setthe receiver to programming mode if not already done b Erase the Operational S W c Transfer the new operational S W data to the receiver d Verify if the operation has been done successfully Type PROG at the DOS prompt to get help information on the utility Example C gt PROG PROGRAMMING UTILITY VERSION 1 104 NOTE this utility uses the serial port interrupt Example PROG UGPSO SUM 1 0 1 0 lt ENTER gt para
104. interchangeably with Pseudo Random Noise Number PRN TDOP Time Dilution of Precision A numerical value expressing the confidence factor of the position solution based on current satellite geometry The lower the TDOP value the greater the confidence factor Three dimensional coverage hours the number of hours per day when four or more satellites are available with acceptable positioning geometry Four visible satellites are required to determine location and altitude Page GOT 5 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION Three dimensional 3D navigation navigation mode in which altitude and horizontal position are determined from satellite range measurements Time To First Fix TTFF the actual time required by a GPS receiver to achieve a position solution This specification will vary with the operating state of the receiver the length of time since the last position fix the location of the last fix and the specific receiver design Track made good the single resultant direction from a point of departure to a point of arrival or subsequent position at any given time may be considered synonymous with Course Made Good True bearing bearing relative to true north compass bearing corrected for compass error True heading heading relative to true north Two dimensional coverage hours the number of hours per day with three or more satellites visible Three visible satellites can be
105. ire Earth as well as possible with a single ellipsoid It is often used as a reference on a worldwide basis while other ellipsoids are used locally to provide a better fit to the Earth in a local region GPS uses the center of the WGS 84 ellipsoid as the center of the GPS ECEF reference frame Waypoint a reference point on a track Page GOT 6 April 17 2000 1PPS 2D 3D A D ASCII BIT bps C A Code CEP CMC CPU CR CRC CTS dB DGNSS DGPS DOP DSP DSR DTR ECEF ESD FOM GDOP GMT GND GPS HDOP hex HTDOP Hz IC IF IRQ CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION GLOSSARY OF ACRONYMS One Pulse Per Second Two Dimensional Three Dimensional Analog to Digital American Standard Code for Information Interchange Built In Test Bits per Second Coarse Acquisition Code Circular Error Probable CMC Electronics Inc Central Processing Unit Carriage Return Cyclic Redundancy Check Clear To Send Decibel Differential Global Navigation Satellite System Differential Global Positioning System Dilution Of Precision Digital Signal Processor Data Set Ready Data Terminal Ready Earth Centered Earth Fixed Electrostatic Discharge Figure of Merit Geometric Dilution Of Precision Greenwich Mean Time Ground Global Positioning System Horizontal Dilution Of Precision Hexadecimal Horizontal position and Time Dilution Of Precision Hertz Integrated Circuit Inte
106. ity performs the following tasks a Verify the parameter values b Verify the receiver binary file validity Send the input message PMCAG 006 MODE 1 or message 112 MODE 0 the specified baud rate parameter d Wait for character 9 SYNC e Start amp Verify Erase process f Change communication baud rate to the TRANSFER B value g Start and Verify Programming process 2 Examples a If the receiver is forced into programming mode via the DISC IP 1 input pin only the following command is necessary PROG FILENAME 1 if COM 1 in use see Default Value for other parameters b If the receiver is in NMEA mode 2 9600 PROG FILENAME 1 1 2 0 This forces the utility to send message PMCAG 006 on COM 1 9600 and to transfer the binary data 38400 c If the receiver is in CMC Binary mode 19200 and wish to set the transfer baud rate 19200 PROG FILENAME 1 0 1 1 d If the receiver sends w characters 4800 PROG FILENAME 1030 In programming mode the MODE parameter is no longer important and can be set to or 1 But the SYNC B R parameter has to be set to the programming mode baud rate in use by the receiver sending w characters Page F 4 Revision B July 9 2001 930 600020 000
107. lity of the receiver with any other receiver bearing the same part number shall not necessitate readjustments of any component in order to meet the performance requirements HARDWARE INTERFACE This section applies to the OEM board version of the receiver For details on the hardware interface of the Development Kit version of the receiver please refer to Appendix A For details on the hardware interface of the STARBOX version of the receiver please refer to Appendix B A Connectors and Connector Pins Assignment 1 Pin Assignment Refer to Appendix C for the pin assignment 2 General The receiver has two standard connectors J1 is a 26 pin connector for general input output interfaces and power input and J2 MCX type RF connector VAR 101 1mm Flexible Printed Circuit 26 pin ZIF connector J1 The receiver is also available in different variations VAR 102 with a 0 100 x 0 100 20 pin 2x10 Right Angle Shrouded Header with detent windows J3 instead of the ZIF connector J1 VAR 103 with a 0 100 x 0 100 20 pin 2x10 Straight Header J3 instead of the ZIF connector J1 on the TOP side VAR 100 with a 0 100 x 0 100 20 pin 2x10 Straight Header J3 instead of the ZIF connector J1 on the BOTTOM side See Appendix C for more details Page 2 9 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION 3 J1 Interface and Power Connector The J1 Interface Connector is a 1mm Flexible Printed Circuit 26 pin A
108. ly 9 2001 It is recommended to CMAC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION Antenna Gain Current Consumption 12dB 20 mA 26dB 35 mA 436dB 50 mA Table D 3 Typical Current Consumption Versus Antenna Gain GEODETIC ACTIVE ANTENNA For RTK applications where centimeter level accuracy is required it is strongly recommended to use an active geodetic GPS antenna if possible In the event where the cable length between the receiver and the antenna is very short less than one meter a passive antenna could then be considered Table D 4 lists the specifications for recommended Passive Antennas Complete drawings could be find at the end of this appendix Antenna Types CMC Part Numbers SUPPLIER Part Numbers Choke ring antenna with trypod 201 990146 888 AT575 90W with 12 dB mount and permanent mount Ground plane included 201 990147 607 AT575 90W with 26 dB 201 990147 680 AT575 90W with 36 dB Completely sealed round disk 201 990146 887 AT575 75W with 12dB antenna with 1 inch tread and 5 8 inch adaptor with build in ground 201 990147 606 AT575 75W with 26 dB plane 201 990147 679 AT575 75W with 36dB Smaller mobile mount ground 201 990147 684 AT575 32W with 12dB plane required Ground plane with 5 8 inch 267 990148 137 SK0044 adaptor for AT575 32 antenna above Table D 4 Recommended Geodetic Active Antennas The Antenna gain should be selected depending on the cable l
109. mc gpsmon You should have a GPSMon Group with two icons in it Start gt Programs GPSMON gt GPSMON to start the GPS Monitor Start gt Programs gt GPSMON gt HELP to start the help information on the GPS Monitor and the ALLSTAR or SUPERSTAR NOTE If you purchased the GPS Heceiver with the Carrier Phase Output option the default communication baud rate will be 19 2 Kbaud For all other versions the baud rate is 9 6 Kbaud Page A 7 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page A 8 Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX B STARBOX CONTENTS Subject Page OV ER VIEW AMPLE T I HY B 1 DESCRIPTION a volver sat red EU B 1 cea B 3 earner area Mie bey Maps an M LOT a B 3 RCRUM B 3 Page B i April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page B ii Revision Sept 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX B STARBOX OVERVIEW The STARBOX is a robust metal casing t
110. me source will be kept valid for VDD down to 2 6 Volts for any variations The Standby Current is measured when the Power Control Input is LO or when the 5V Digital is below the 4 5V threshold 5 current in SRAM Keep Alive Mode Figure 2 6 Power Input Sheet 2 of 2 Power Control Input The receiver possesses its own circuitry to perform a proper power down and power up sequence in order to preserve the non volatile data in SRAM The Power Control input allows also the possibility to generate a master reset Standby Mode to the receiver without removing the power A low voltage input will cause a master reset Refer to Appendix C for the electrical characteristics Preamplifier Power Pass Through Antenna Supply The preamp signal is available on the I O connector for the host to provide power to the antenna preamplifier via the centre conductor of the RF cable J2 The receiver is capable of handling voltages in the range of 5V to 16V Note Maximum current is 100 mA J2 RF Input The receiver will receive the GPS signal from the antenna amplifier on one RF input connector J2 The RF input port impedance is 50 Ohms nominal with a maximum return loss of 10 dB over the frequency range of 1575 42 3 MHz The nominal source impedance presented by the antenna shall be 50 Ohms with a maximum return loss of 10 dB Discrete Inputs For normal operation all discrete inputs can be left opened See Appendix C for the electri
111. mer market navigation systems Code Differential GPS Code DGPS is the regular Global Positioning System GPS with an additional correction differential signal added This correction signal improves the accuracy of GPS and can be broadcast over any authorized communication channel The GPS determined position of a base station is computed and compared to its surveyed geodetic position The differential information is transmitted to user receivers by radio or other means These differences can then be matched up with GPS measurements from the roving GPS receiver and used to remove the systematic correctable error factors A DGPS system therefore consists of at least two units a base station and one or several roving units The base station broadcasts its differential data and the roving units receive it through a data port directly connected to a radio receiver The roving units can then display velocity time and other information as needed for their marine terrestrial or aeronautical applications The receiver with a separate GPS antenna decodes the GPS satellites RF signal and interfaces with a host system to provide three dimensional user position and velocity time and other status information at a maximum rate of once per second along with differential corrections for each satellite tracked The receiver uses WGS 84 as its geographic reference The receiver has 12 independent parallel channels each capable of simultaneously tracking
112. meter 1 Operational S W filename parameter 2 PC Serial Port parameter 3 0 CMC Binary 1 NMEA protocol parameter 4 Synchronisation baud rate 300 to 19200 parameter 5 Data transfer baud rate 300 to 38400 Baud Rate Code 0 38400 1 19200 2 9600 3 4800 4 2400 5 1200 6 600 7 300 Parameters 3 4 and 5 are optional and their default values are 0 1 0 Page F 2 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION PROG EXE PARAMETERS The PROG EXE utility requires the following parameters PROG FILENAME COM MODE BAUD_RATE TRANSFER_B_R Parameters MODE BAUD RATE and TRANSFER B are optional and have the following default values FILENAME New receiver binary file provided by CMC COM PC Serial Communication Port presently used COM 1 1 COM 2 2 MODE Actual receiver operating mode CMC Binary 0 NMEA 1 Default Value 0 CMC Binary SYNC B R Synchronisation Baud Rate 38400 19200 9600 4800 2400 1200 600 300 Default Value 1 19200 Note This baud rate will be used by the receiver to start data exchange with the Programming utility when in Programming mode TRANSFER B Data Transfer Baud Rate see SYNC B description for possible values Default Value 0 38400 Page F 3 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION PROGRAMMING UTILITY ALGORITHM 1 Programming util
113. n the status of a file transfer performed via a command message The status is encoded in the MSB of the ID field If the MSB 0 the command request is unsuccessful If the MSB 1 the command is successfully performed This message is sent within 1 minute after the command message This is currently only use for the almanac INITIATION Upon receipt of initiate link message block containing a valid password the receiver sends a message block back to the transmitter with its own password This command also cancel all previous data request messages within 2 seconds The receiver will respond within 300msec to the initiate link command DATA TRANSMISSION In most cases the receiver is given command message blocks for which it must respond with one or several blocks of data Typically the following sequence of events occurs once the link is initiate The transmitter sends one or more message blocks to the receiver while keeping track of all message blocks that need to be acknowledged by the receiver The receiver searches out each message block sent by the transmitter and then compare its own checksum calculation with the value that was sent by the transmitter If the values match the receiver includes that particular ID in the acknowledge message block If the checksums are different the receiver will not include the ID Once all message blocks received during the last time interval scheduled by its executive are decoded a new acknowledge message
114. of any DGPS system The functionality and reliability of the link can have a significant effect on the success of the DGPS system The key functional parameters affecting the performance and cost of DGPS wireless links are Range One way versus two way data capability Latency and rate of data transmission Radio Frequency Frequency Selector Interference Rejection Wide area Differential network capability For narrow band communication typical frequencies of operation are in the 150 MHz or 450 MHz bands Data rates range from 9600 to 19 2 kbps RF transmit power ranges from 2 W to 30 W For spread spectrum links 900 MHz or 2 4 GHz is typical Data rates range from 19 2 to 115 kbps Power is Page 3 2 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION 1 Wor less These are typically short range lt 5mi links for portable or mobile operation A Range Exact range of a wireless radio link is difficult to calculate without a detailed engineering analysis Reasonable approximations are possible however Range is primarily affected by the combination of the following factors e Terrain e Transmit power and receiver sensitivity e Transmitter and receiver antenna gain The simplest calculation of range assumes the earth is smooth and spherical This is the starting point for all range calculations and establishes the minimum height requirements for the antennas The calculation establishes range by line of s
115. oftware updates via the RS 232 communication port in less than 2 minutes The OEM circuit card assembly is forced to enter reprogramming mode when the voltage at the input pin DISC_IP_1 is HI More information on this mode is available on request PROGRAMMING MODE PROCEDURE The receiver can be set to programming mode by hardware or by software 1 PROGRAMMING MODE SETTING BY HARDWARE a At the 26 pin ZIF connector J1 tie pin 9 to the 5V supply b At the 20 pin header connector tie pin 6 to the 5V supply Apply either 5V supply voltage to the receiver or a master reset pulse to the power control input pin J1 5 or J3 3 Notes 1 If a programming adapter CMC 220 600932 000 is used set S2 to PROG then apply 5V supply voltage or press 51 if supply voltage is already applied 2 The baud rate for programming mode setting by hardware is 19200 PROGRAMMING MODE SETTING BY SOFTWARE To set the programming mode by software enter message PMCAG 006 when in NMEA mode or message ID 112 when in Binary mode In either case the receiver will be forced to enter the programming mode at a specific baud rate The commands are sent at the operating baud rate Once these commands are decoded the receiver will enter programming mode at the specified baud rate independently of the operating baud rate Example NMEA PMCAG 006 19 2 7A lt CR gt lt LF gt Binary 0x01 0x70 0x8F 0x01 0x40 0x41 0x01 The programming utility w
116. ons other than a receiver power interrupt for a period of less than or equal to 200 milliseconds When a satellite signal is lost for reasons other than a receiver power interrupt for a period greater than 200 milliseconds but less than 5 seconds the receiver reacquires the satellite signal within 0 3 seconds after the satellite visibility has been restored Page 2 2 April 17 2000 10 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION When a satellite signal has been lost due to signal masking the signal is typically reacquired within 2 3 seconds after the satellite signal meets the minimum input levels The vehicle dynamics during the masking period are assumed to be less than or equal to 0 5g acceleration and 100 m s velocity When total signal masking occurs navigation will resume within 3 5 seconds of a Navigation mode criteria being met Measurement Rate The receiver is capable of 10 measurements per satellite per second A complete navigation solution is computed every second 2 per second if in 2Hz PVT mode or 5 per second if in 5Hz PVT mode whenever a sufficient set of measurements is acquired Operational Signal Level Input The receiver will operate with a signal level input from 165 dBW to 120 dBW RF Input Impedance The impedance is 50 ohms with VSWR of 2 0 1 or better Receiver Noise Figure The receiver has the following noise figure characteristics Typical 3 8 dB Maximum 4 8 dB in the
117. oss between the antenna and the receiver Prices and availability can be found in the latest GPS OEM Price List You can request this list by sending an e mail to the GPSMARKET the exact e mail address is supplied in section 7 of this document Page D 3 Revision B July 9 2001 CMAC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION ACTIVE ANTENNA Lower cost antennae for higher volume applications or for more cost sensitive applications are available All GPS receivers manufactured by CMC implement a 20dB LNA on board For this reason an Active 12dB is more than adequate antenna with 26 dB and 36 dB may overdrive the RF input of the GPS Receiver if used with a short cable between the Antenna and the Receiver The Table D 5 lists the active antennae which could be used with any of the CMC GPS receivers Table D 5 Recommended Active Antennae Typical Applications CMC Part Numbers Supplier Part Numbers AVL This antenna is currently 201 990146 716 MCX connector amp 6 AT575 70W 12 dB supplied with ALLSTAR and the meter cable PERSTAR devel ki SUPERS TAFEORVSIOPMENEKID 2551 6901 46788 BNC medee meter cable 201 990148 152 TNC connector amp 6 meter cable The lowest cost available for AVL 201 990147 432 TNC Female Bulk head AT575 104W 12dB Marine application 201 990144 807 TNC Female Bulk head AT575 68W 124 NOTE Prices and availability can be found in the latest GPS OEM Price List You can
118. other users on a frequency Having a larger number of positions on the selector switch can give a greater choice of alternate frequencies Interference Rejection Common forms of interference are Co channel Image channel Intermodulation Adjacent channel Page 3 4 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION Co channel interference is when someone is operating on the same channel as your wireless link The simplest ways to eliminate this are to relocate to a different channel or to use more power than the competitor Note that using more power means that your receiver must see you base station at a higher power level than the competing station Image channels are channels that are separated from your channel by 2x the first intermediate frequency of your receiver A common is 21 4 MHz With poor image rejection a channel that is 42 8 MHz away from your channel can strongly interfere with your desired signal An external preselector can minimize this problem Some radios are available with high selectivity preselectors already built in and thus minimize the tangle of extra cables and bulk of the external unit Intermodulation IM interference is a complex process where two channels mix to generate a signal that is on your channel This mixing can take place in the DGPS wireless link receiver Some types of IM can be reduced by having a good preselector on the receiver front end thereby att
119. ours double ROO GSP Don t Care 21 28 Interpreted field 000 BYY Latitude radians double SYY ROO GSP Don t Care 29 36 Interpreted field 000 BYY Longitude radians double SYY ROO GSP Don t Care 37 38 CheckSum 1 5 8 Mask angle 0 2 2 short float N A N A 9 16 Reserved 5 12 Password UGPS XXX in ASCII format N A char 8 The value will be stored in NVM Page 5 10 Revision B July 9 2001 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION MESSAGE BYTE DESCRIPTION UNIT TYPE 88 Select the datum used to report the Select Define datum position and define user defined datum 5 Function N A N A 0 Select datum 1 Define a user defined datum 2 Select and define a user defined datum 6 datum number from 0 to 63 see N A N A Supported Datum List Appendix TBD 7 8 dx Meter signed short 9 10 dy meter signed short 11 12 dz meter signed short 13 20 semi major meter long float 29 36 Reserved Note The navigation data user coordinates message contains the datum currently in use 90 Set deselection for all 32 SVs if password Set SV deselect valid The SVs deselect is indicated in a bit map form 1 in the bit map specifies that the corresponding SV shall be deselected 5 12 Password UGPS 000 in ASCII format N A char 8 U character first bit map bit 0 gt SV 1 bit 7 gt SV 8 N A N A bit map bit 0 gt SV 9 bit 7 gt SV
120. out should occur for the corresponding request Transmit Timeout Errors The transmitter should wait up to the message rate for the reception of a data message block Afterwards the transmitter should report the error Frame Synchronization Errors Since extraneous characters can be generated when using asynchronous communications the receiver does not count on receiving valid blocks with no extra characters for each block transmitted Synchronization is as follows if the character received when expecting the start of a block is not a SOH then it ignores the character and continues to search for a SOH Once a SOH is found the receiver assumes that the next two bytes are a valid block ID number and complement If they are complements then it assumes that the packet has begun and the search for the next SOH starts after the checksum even if the checksum is invalid If they are not complements it continues to search for SOH from the location of the block ID F CHECKSUM CALCULATION RULES The 16 bit checksum is defined as the 16 bit sum of all the unsigned 8 bit bytes starting at the beginning of the header any overflow or carry to the 16 bit sum is discarded immediately Therefore it adds unsigned bytes to produce a 16 bit result For example a valid initiate link message can be SOH ID Compl ID Length U G P 0 0 0 Cksum LSB Cksum MSB 01 63 192 08 85 71 80 83 45 48 48 48 772 decimal O1h 3Fh COh 08h 55h 47h 5
121. period the computed position will automatically be used as the base station s position and the encoding of the differential messages will start if the differential message rates have been configured properly e Get Survey will take a snapshot of the current self surveyed position and save the base station position with this calculated position It will start the encoding of the differential messages if the differential message rates have been configured properly NOTE 1 A Get Survey request will automatically stop any survey request initiated by a Set Survey request 2 A Get Survey request can be performed at any given time It configures the base station position with the position computed by the self survey process Message ID 91 sets the following parameters e differential message type the RTCM message types e differential message transmission period 0 to 255 where 0 stops transmission The detailed contents of these messages are provided in the Serial Data Interface section Moving a base station Special care must be taken when moving a base station that has been configured with a position Since the base station configuration is saved in NVM this configuration must be invalidated when the power is reapplied on the base station if roving units are monitoring the base station It is recommended to set all the differential messages rate to 0 before moving the base station This will avoid the roving station
122. r all weather conditions The GPS constellation will consist of 24 orbiting satellites four equally spaced around each of six different orbital planes The system is being developed by the Department of Defense under U S Air Force management Great circle the shortest distance between any two points along the surface of a sphere or ellipsoid and therefore the shortest navigation distance between any two points on the Earth Also called Geodesic Line HDOP Horizontal Dilution of Precision A numerical value expressing the confidence factor of the horizontal position solution based on current satellite geometry Makes no constraint assumptions about time and about height only if the FIX HEIGHT command has been invoked The lower the HDOP value the greater the confidence in the solution HTDOP Horizontal position and Time Dilution of Precision A numerical value expressing the confidence factor of the position solution based on current satellite geometry Assumes height is known if the FIX HEIGHT command has been invoked If not it will give the normalized precision of the horizontal and time parameters given that nothing has been constrained The lower the HTDOP value the greater the confidence factor Heading the direction in which a vessel points or heads at any instant expressed in degrees 000 clockwise through 360 and may be referenced to True North Magnetic North or Grid North The heading of a vessel is also called the ship s
123. r go pP De EIE 5 4 ODATA TRANSMISSION idein heh eua ku nha aeta ea epa haga uus erae aeta Cet hase 5 4 ERROR RECOVERY AND TIMING 5 0592 cane en tee eno e euet cnn tnnc rado tenet 5 5 CHECKSUM CALCULATION 6 5 5 DATA STRU GTURE tih ee eor rte eene eie rh riget cnn e A sag e Pr nea vend 5 6 H MESSAGE STRUCTURE docere se Doo aged d doo 5 7 HOST CPU TO RECEIVER 565 5 5 8 Aa MESSAGE SUMMARY eet eta retra ee E ud den Qr a envy venei 5 8 B MESSAGE CONTENT HOST CPU TO RECEIVER essent nnne nennen 5 9 RECEIVER TO HOST CPU MESSAGES ele ee esee meer teed cae betes NAAV ASEEN AN EEEE ENS NNE ENER EE 5 13 A MESSAGE SUMMARY de e ERR e es a Ca ual e 5 13 B MESSAGE CONTENT RECEIVER TO HOST nennen nennen 5 14 Page 5 i April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page 5 ii Revision A Sept 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION SECTION V SERIAL DATA INTERFACE SERIAL DATA PROTOCOL The purpose of this section is to define a serial data transfer protocol for the receiver The serial data is transmitted in variable size message
124. rawing 217 601730 XXX used in conjunction with the smaller cable CMC Drawing 217 601727 XXX which is usually required between the receiver and the chassis case of the user system You will find the Nominal Capacit Table D 1 101 7 pf per meter 1000mhz 44 3 dB 100 meters 54 dB 1575MHz drawings for these two cables at the end of this section Coax Cable Specifications CMC Cable PNs MAX LENGTH 217 601730 XXX ANTENNA CABLE TYPE MIN LENGTH GAIN 217 601730 XXX 0 dB no LNA RG 58 Low Loss 3 meter 3 dB 0 feet 217 601730 XXX 12dB RG 58 Low Loss 20 meter 12dB 0 feet 217 601730 XXX 26dB RG 58 Low Loss 50 meter 28dB 20 meter 12dB 36dB RG 58 Low Loss 65 meter 36dB 50 meter 28dB type of coax cable with a lower lost per meter The 26dB and 36dB antenna can accept a supply voltage between 5V and 18VDC compute the drop in the coax cable so the active antenna will always see the minimum operating voltage of 4 5Volt The Table D 3 list the current taken by each of these antenna Table D 2 Antenna Gain Depending on Cable Length Required A 1 dB loss for the coax cable is usually required between the RG 58 cable and the GPS Receiver MCX connector and it is included in attenuation number in parentheses the antenna and the GPS receiver needs to be longer than 65 meters the user shall select an other If the distance between Page D 2 Revision B Ju
125. rent navigation sub mode on its host port a Differential Roving Unit Only The receiver operates in Differential mode when data from at least 4 satellites with adequate geometry and differential corrections and or measurements exists to compute position velocity and time outputs This is the preferred navigation mode Differential data is supplied to the receiver via the differential input port Differential data can be received only on the auxiliary serial data port b Stand Alone Nav Roving Unit Only The receiver operates in Stand Alone Nav mode when data from at least 4 satellites with adequate geometry but no differential corrections or measurements exists to compute position velocity and time outputs This is the preferred navigation mode when insufficient differential data is available to generate a differential GPS fix Page 4 3 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION c Base Station Nav Base Station Unit Only The receiver operates in Base Station Nav mode once the time has been initialized and at least 4 satellites with adequate geometry can be used for navigation purposes Once in this mode only a change of configuration rover mode requested or a reset will cause the unit to leave this navigation mode In this mode the unit will have the ability to transmit the DGPS messages which are requested and allowed once its position is initialized Refer to the Configurable Parameters
126. rmediate Frequency Input Output Issue of Data Ephemeris Interrupt Request Page GOA 1 Revision B July 9 2001 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION LF Line Feed LHCP Left Hand Circular Polarization LNA Low Noise Amplifier LO Local Oscillator Isb Least significant bit msb Most significant bit msec millisecond MSL Mean sea level MTBF Mean Time Between Failures N mi Nautical mile NCO Numerically Controlled Oscillator NMEA National Marine Electronics Association nsec nanosecond OCXO Oven Controlled Crystal Oscillator OEM Original Equipment Manufacturer PC Personal Computer PCB Printed Circuit Board P Code Precise Code PDOP Position Dilution Of Precision PLL Phase Lock Loop PPS Precise Positioning Service or Pulse Per Second PRN Pseudo Random Noise number PVT Position Velocity Time RAM Random Access Memory RF Radio Frequency RHCP Right Hand Circular Polarization ROM Read Only Memory RTC Real Time Clock RTCA Radio Technical Commission for Aviation Services RTCM Radio Technical Commission for Maritime Services RTK Real Time Kinematic RTS Request To Send RXD Received Data SA Selective Availability SEP Spherical Error Probable SNR Signal to Noise Ratio SPS Standard Positioning Service SRAM Static Random Access Memory SV Space Vehicle Page GOA 2 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION TCXO Temperature Compensated Crystal Oscillator TDOP
127. s from generating erroneous solutions Configuration process example Here are the typical steps that should be followed in order to achieve an easy base station installation Page 4 6 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION a Power on the unit b Using message ID 80 send a Set Self Survey request to the unit recommended survey time of 10 minutes This will put the unit in base station navigation mode c Using message ID 91 set the desired differential message rates At this point the base station should start to generate corrections d Power up a roving unit and establish the radio link between the two e Once the radio link has been established and everything works fine the base station should now enter a longer self serveying period to ensure sufficient accuracy of the base station s position Using message ID 80 send a Set Self Survey request to the unit recommended survey time of 24h The base station will automatically start to transmit the corrections at the end of the survey period f Reset the roving unit This will permit to start navigating with knowledge of the proper base station position when the survey process is finished Note If the precise base station position is already known set the base position using message ID 80 in step b and skip steps e and f B MASK ANGLE The mask angle is defined as the minimum satellite elevation angle in degrees
128. se station s antenna The intent is to have all satellites that are visible at the roving user s antenna to be visible at the base station as well 2 As well multipath interference must be minimized as much as possible Multipath is defined as the interaction of the GPS satellite signal and its reflections this causes errors mainly on the GPS code but not so much on the GPS carrier Even though the receiver uses carrier phase measurements it can revert to code differential GPS operation if carrier phase differential GPS cannot be performed Hence the base station s antenna must be far from any reflecting elements 3 The position of the base station s antenna must be surveyed using appropriate surveying equipment This position must then be programmed in the base station using the message ID 80 Any error in the base station s position will be reflected in the roving user s computed position DATA LINK 1 The data link must operate at a minimal rate of 9600 bauds 2 The required power level depends on the distance separating the base station and the roving units BASE STATION AND ROVING UNITS SEPARATION The operational range of carrier phase differential measurements is limited to about 20 km after which significant accuracy degradation could occur If your application requires greater separations your own base station network must be established CHOICE OF A WIRELESS DGPS DATA LINK The choice of wireless link is a key part
129. served 47 48 byte 1 Msg Type N A byte byte 2 Programmed Msg Rate Period Sec byte 49 50 Checksum N A N A 48 This message is output at a nominal rate Differential Message of once per second upon reception of a Status message ID 48 request 5 Station Id bits 0 7 N A byte Page 5 17 April 17 2000 cme electrenics USER S MANUAL ALLSTAR DGPS BASE STATION MESSAGE BYTE DESCRIPTION UNIT TYPE 48 6 bit 0 1 Reserved N A byte Cont d bit 2 4 Station Health bit 5 6 Station Id bit 8 9 bit7 Reserved 7 14 Msg Type Received Bitmap 1 N A N A bit63 64 15 16 Receiver Mode N A N A Differential data link Valid Word Count Base Mode Reserved 17 18 Receiver Mode N A N A Differential data link Parity Error Count Base Mode Reserved 19 Reserved N A N A 20 Reserved N A N A 21 Reserved N A N A 22 Reserved N A N A 23 Reserved N A N A 24 Reserved N A N A 25 26 bits 0 12 ZCount of last message 1 2 N A N A 3 9 or 59 Receiver Mode bits 13 15 DGPS Status 0 gt DGPS Disabled 1 gt Initialization Synchronization 2 gt Correcting 3 gt Bad GDOP 4 gt Old corrections 5 gt Station unhealthy 6 gt Too few SVs 7 gt Reserved Base Mode Reserved 27 28 Reserved N A N A 29 30 Checksum N A N A 49 This message is output at a nominal rate N A N A CPU Receiver Status of once per second upon reception of a message ID 49 request System S
130. slands 37 North American 1927 Clarke 1866 10 158 187 Canada 38 North American 1927 Clarke 1866 7 162 188 Canada Alberta British Columbia 39 North American 1927 Clarke 1866 9 157 184 Manitoba Ontario 40 North American 1927 Clarke_1866 22 160 190 Canada New Brunswick Newfoundland Nova Scotia Quebec 41 North American 1927 Clarke 1866 4 159 188 Northwest Territories Saskatchewan 42 American 1927 Clarke 1866 7 1394 181 Yukon 43 North American 1927 Clarke_1866 44 North American 1927 Clarke 1866 125 201 Canalzone 0 125 194 Central America 45 North American 1927 Clarke 1 866 46 North American 1983 GRS 80 47 Egyptian 1907 Helmert 1906 12 130 190 Alaska Canada CONUS Central America Mexico 130 110 13 Egypt in Hawaiian 866 181 Hawaii Kauai Maui Oahu 49 Oman Clarke 1880 346 1 224lOman 50 Ord Survey G Britain 1936 375 111 431 England Isle of Man Scotland Shetland Islands Wales 51 Pitcairn Astro 1967 International 185 165 42 Pitcairn Island 52 National International 128 283 22 Qatar 53 International 1644 138 189 South Page E 2 April 17 2000 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION NAME ELLIPSE Dz COUNTRIES
131. t they will be kept in NVM This prevents having to reconfigure a base station unit every time the power is cycled Since a precise knowledge of the base station position is required before being able to operate its exact position must be saved in NVM The base station is capable of self surveying its position The precision obtained from a self survey operation is in the order of 2 meters For a better precision the position of the antenna must be surveyed using precise surveying equipment 1 Configuration Messages Message ID 80 permits the following set the base station s ID number from 0 to 1023 e set the base station s health refer to Ref 2 for health codes e the base station s position with a known position or the current self surveyed position e start a Self Survey operation for a defined time period Page 4 5 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION Self Survey operation Upon entry in the base station navigation mode the self survey process is started and will continue as long as the unit stays in the base station navigation mode There are two ways to take advantage of the Self Survey capability the Set Survey command and the Get Survey command which are both supported by message ID 80 e Set Survey resets the current self surveyed position and restarts the self survey process for the desired period of time maximum duration 48 hours At the end of the
132. tatus 1 bit Failure 1 N A N A Normal 0 Last Power Mode 2 bits N A N A 0 noNVM 1 Cold Start 2 Warm Start 6 7 Almanac Week Number week N A 8 Mask Angle 0 01 unsigned word 9 bit 0 Tropo Model Enabled N A N A bit 1 Mean Sea Level Enabled 10 1 s TCXO Drift Hz signal word 12 1 TCXO Ageing 0 1 ppm unsigned char 14 NAV mode N A N A Page 5 18 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION MESSAGE BYTE DESCRIPTION UNIT TYPE 49 Cont d 15 51 5 Initiated BIT Result 7 9 10 bit 0 COM1 Overflow bit 1 COM2 Overflow CPU Usage bit 0 7 Copy of the Initiated BIT request message byte 1 General Results 0 fail 1 Pass bit 0 RAM bit 1 Flash bit 2 Eeprom bit 3 Uart bit 4 Real Time Clock bit 5 Correlator amp RF bit 6 7 Reserved Reserved Memory Test Results O ok 1 failure bit 0 Bad Boot S W Checksum bit 1 Bad Operational S W Checksum bit 2 4 FLASH Error Code if different of 000 Receiver can not be reprogrammed bit 5 7 Reserved EEPROM Status bit 0 7 Number of Usable Pages Primary Port UART busy bit 0 UART not ready or UART busy bit 0 UART not ready or UART busy bit 1 TX not full flag error bit 2 No Data received during internal loop tests bit 3 Framing or Parity error bit 4 RX not full flag error bit 5 OVERRUN test failed bit 6 7 Reserved Auxiliary Port UART results
133. te location of the receiver so a prediction can be made as to which satellites are visible The receiver then collects ephemeris data by decoding the satellite down link data message After each satellite in view is acquired its measurement data set is produced When a sufficient number of satellites are being tracked position velocity and time can be computed and Navigation mode entered If the receiver cannot perform an acquisition due to an absence of valid almanac data or user position and or time it initiates a Search the Sky acquisition The receiver attempts to acquire all satellites in the GPS constellation Once a satellite has been acquired ephemeris data is decoded from the satellite down link message After sufficient satellites have been acquired the receiver enters Navigation mode In Search the Sky the TTFF is typically less than 3 minutes Navigation Mode The receiver is in Navigation mode whenever sufficient satellite information and measurement data is available to produce a GPS fix Navigation Mode is entered from Acquisition or Dead Reckoning mode and exits to Dead Reckoning or Fault mode In Navigation mode a receiver configured as a roving unit operates in 2 sub modes Differential and Stand Alone Nav Sub mode transition occurs automatically depending on satellite data availability A receiver which is configured as a base station unit will operate in Base Station Navigation mode only The receiver reports its cur
134. ted herein Should any damage occur to the receivers during shipping handling or misuse by the user CMC can service them Try to be as complete and accurate as possible when you describe a problem Page 7 1 Revision B July 9 2001 CMAC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION PRODUCT UPDATED All product updates will be advertised on our Web site TROUBLESHOOTING AND FREQUENTLY ASKED QUESTIONS FAQ A FAQ list is available on our Web site CONSULTATION Technical consultation can be obtained from CMC if GPS expertise is needed for the integration of the receiver into your application We can provide support either at the system design implementation or testing phase For more details please contact Technical Support refer to Points of Contact section above Page 7 2 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION APPENDIX A RECEIVER DEVELOPMENT KIT CONTENTS Subject Page OV EVIE W gt 1 DESCBIPTION nero Viren SUERTE REND o edicti massi I EU Eur A 1 DEVELOPMENT KIT SETUP AND A 2 SETUP Pen c P MM SI M uM A 2 DIP SGWITOHES E
135. tences calculated by the talker appended to the message then recalculated by the listener for comparison to determine if the message was received correctly Required for some sentences optional for all others Circular Error Probable CEP the radius of a circle centered at the user s true location that contains 50 percent of the individual position measurements made using a particular navigation system Coarse Acquisition C A Code a spread spectrum direct sequence code that is used primarily by commercial GPS receivers to determine the range to the transmitting GPS satellite Uses a chip rate of 1 023 MHz Communication protocol a method established for message transfer between a talker and a listener which includes the message format and the sequence in which the messages are to be transferred Also includes the signalling requirements such a baud rate stop bits parity and bits per character Control segment the Master Control Station and the globally dispersed Monitor Stations used to manage the GPS satellites determine their precise orbital parameters and synchronize their clocks Page GOT 1 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION Course the horizontal direction in which a vessel is to be steered or is being steered the direction of travel through the air or water Expressed as angular distance from reference North either true magnetic compass or grid usually 000 north clo
136. to diss cost 0 fronts A GAN 6 2 icem cei 0 DTE 0 Sisi beet n RD adios A eee tee B D 6 thru 11 22 0 A Eoo ptatem etatis 0 Elli hiat E T thri 0 0 lt nee ette ci B Page LEP 2 Revision B July 9 2001 eme electrenics ELECTROSTATIC DISCHARGE USER S MANUAL ALLSTAR DGPS BASE STATION FORWARD This equipment contains components which are sensitive to damage by electrostatic discharge ESD Modules containing components sensitive to ESD are identified on the module by a label bearing the following marking CAUTION THIS EQUIPMENT CON TAINS PARTS SENSITIVE TO DAMAGE BY ELECTROSTATIC DISCHARGE ESD USE ESD PRECAUTIONARY PROCEDURES WHEN TOUCHING REMOVING OR INSERTING PARTS OR ASSEMBLIES When these modules have to be replaced and returned for service the following precautions should be observed 1 Handle the modules as little as possible Do not touch the leads pin or tracks while handling 2 Keep spare modules in the ESD protective packing until ready for use 3 Discharge static before handling modules removal or replacement by touching a grounded metallic surface such as rack or cabinet hardware Use of wrist strap grounded through a one megohm resistor is preferred when
137. uly 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION B Operational Information The Operational information contains both the factory and the current operating mode information The current operating mode baud rate is output twice This is useful when the operating baud rate is not 9600 Example lt Nb 169 614110 XXX 0 0000003 SHP Go to CMC Binary 19200 baud In CMC Binary 19200 baud 3 gt Note 1 Operational S W Part Number Note 2 Power up BIT result Note 3 Line transmitted at the Configured Baud Rate CONFIGURABLE PARAMETERS Several parameters of the receiver and the base station are configurable and therefore must be defined by the user prior to operation A BASE STATION CONFIGURATION The auxiliary communication port COM2 is used to output the differential data Its baud rate is fixed at 9600 bauds The base station must be properly configured in order to encode the differential messages The two elements that are required are a precise position in order to be able to calculate the corrections and the list of messages that are to be transmitted by the base station with their transmission rates Two CMC binary messages permit the configuration of these elements through the main communication port COM1 These messages are Set Operating Mode message ID 80 and Set Differential Message Rate message ID 91 Once these parameters have been set once on a uni
138. used are selected for their full compliance to airborne requirements and are under statistical process control All manufacturing processes are fully documented B Equipment Markings The receiver part number shall be 220 600944 10X The last digit shall be used to identify specific variations 1 S W Part Number The S W part number appears on a label on top of the FEPROM The host shall get access to the latest S W part number on the serial interface port 2 Modification A modification record numbered from 1 through 5 shall be etched on the PCB close to the H W part number This modification number shall be used primarily for H W changes 3 Electrostatic Discharge Protection The receiver shall be identified with a Caution Label The receiver can withstand an electrostatic discharge level of 2kV from 100pF through 1 5kQ between any two pins in either polarity Mil Std 883 human body model C Built In Test BIT Requirements The receiver performs self tests and generates status information to provide an indication of the operational readiness and facilitate maintenance actions Failure indication is transmitted on the primary serial output bus via the self test result message ID 51 90 of all receiver failure modes are detected and annunciated or have no effect on receiver outputs Page 2 8 Revision B July 9 2001 electrenics USER S MANUAL ALLSTAR DGPS BASE STATION D Interchangeability Interchangeabi
139. used to determine location if the GPS receiver is designed to accept an external altitude input Two dimensional 2D navigation navigation mode in which a fixed value of altitude is used for one or more position calculations while horizontal 2D position can vary freely based on satellite range measurements Undulation the distance of the geoid above positive or below negative the mathematical reference ellipsoid spheriod Also known as geoidal separation geoidal undulation geoidal height Universal Time Coordinated UTC this time system uses the second defined true angular rotation of the Earth measured as if the Earth rotated about its Conventional Terrestrial Pole However UTC is adjusted only in increments of one second The time zone of UTC is that of Greenwich Mean Time GMT Update rate the GPS receiver specification which indicates the solution rate provided by the receiver when operating normally VDOP Vertical Dilution of Precision A numerical value expressing the confidence factor of the position solution based on current satellite geometry The lower the VDOP value the greater the confidence factor Variable field by NMEA standards a data field which may or may not contain a decimal point and which may vary in precision following the decimal point depending on the requirements and the accuracy of the measuring device WGS 84 World Geodetic System 1984 is an ellipsoid designed to fit the shape of the ent
140. uxiliary Serial Interface Port Receiver Note 2 22 RESERVED 23 RESERVED 24 RESERVED 25 12V_DC 9V 36V Power Input With Reversed Voltage Protection Note 1 RS232 Driver 5V in Short Circuit Protection 60mA max Note 2 RS232 Receiver Vil 0 7V Vih 2 0V 8V max for normal operation Note 3 Should be lefted OPEN in not used in the application Page B 2 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION RF CONNECTOR The GPS RF connector is a TNC female connector LEDs The STARBOX has 2 LEDs LED s COLOR DESCRIPTION YELLOW When flashing at a 1 Hz rate indicates that the receiver had enough satellite information to perform a Navigation solution Doesn t flash by default after a power up GREEN Valid Internal 5 Volt Indicator CABLE A schematic of the cable to be used with the STARBOX is depicted in Figure B 2 It s part number is 217 601729 VAR Page B 3 April 17 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION This Page Intentionally Left Blank Page B 4 Revision A Sept 2000 CMC electrenics USER S MANUAL ALLSTAR DGPS BASE STATION

USER`S MANUAL ALLSTAR DGPS BASE STATION P/N 220

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