FTS500 GPS Disciplined Clock User Manual - Connor
Contents
1. DiffStation Differential base station ID cs Message checksum in hexadecimal 7 1 3 GPGSA GPS DOP and Active satellites GPS receiver operating mode satellites used for navigation and DOP values GPGSA Smode FS Sv SV SV SV PDOPHDOP VDOP cs Name Description GPGSA NMEA sentence header Satellite Data Smode A Automatic switching 2D 3D M Manually fixed 2D 3D FS Fix Status 1 No fix 2 2D GPS Fix 3 3D GPS Fix SV Satellites in use null for unused fields 12 available fields PDOP 3 D Position Dilution of Precision 0 00 to 99 99 HDOP 2 D Horizontal Dilution of Precision 0 00 to 99 99 VDOP Vertical Dilution of Precision 0 00 to 99 99 cs Message checksum in hexadecimal CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 14 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 7 Communication Protocols continued 7 1 4 GPGSV GPS Satellites in View The number of satellites in view together with each PRN elevation and azimuth and C No value Up to four satellite details are transmitted in one message with up to three messages used as indicated in the first field SGPGSV NoMsg MsgNo NoSvj sv elv az cno sv elv az cno Cs Note designate optional sections that appear only if there is satellite data Name Description GPGSV NMEA sentence header Satellite Data N2. NC TX RX NC Ground NC NC NC NC O CO NN D OH A Ww P Table 4 RS232 Interface CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 10 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 4 INTERFACES 4 1 Power The FTS500 is powered through the Molex power connector with 8 to 26 VDC The FTS500 kit includes a DC adapter with the correct voltage and connector 4 2 Antenna Connection The antenna is connected using the female BNDC connector marked RF IN If the necessary antenna has a different connector a suitable adaptor is required The FTS500 provides 5VDC to the antenna jack to power active antennas A maximum of 45mA should be drawn from the antenna power to prevent the overcurrent protection int he FTS500 from activating 4 3 Serial Port The RS232 serial port is available on the DB9 F connector The FTS500 outputs NMEA 0138 sentences through the serial port as well as accepts configuration commands A detailed description of the communications protocol is given in Section 8 4 4 1PPS Output The 1PPS output is available on the BNC connector labeled 1PPS The 1PPS interface outputs a precise pulse with respect to UTC time The signal is acctive high with the rising edge synchronous 25 ns RMS to the UTC second and has a width of 100us Alternate pulse widths may be accommodated with custom
3. walking Automotive Land Vehicle Marine Airborne Low dynamics lt 1g Limit of FTS500 Airborne Medium dynamics lt 2g Airborne High dynamics lt 4g Airborne Very High dynamics lt 8g Drone Missile dynamics lt 16g 10 Pure least squares mode ie semi infinite dynamics assumed The dynamics setting on the FTS500 should not be changed by the user 7 3 3 PRTH lt Q S R gt ITIM INITIALIZE TIME AND DATE Purpose This message Sets Queries and Responds to the user initialized time and date Two input options are available one allowing a calendar date and GMT time to be input and the other a GPS week number and seconds of week The input date is acted upon regardless and is primarily used to set the GPS week inside the receiver The time input will not be used if is set to zero or if the receiver is currently tracking any satellites and therefore already has a good sub millisecond knowledge of time If the time input is not used then the Response message returns the values used or assumed instead of those input The time RMS accuracy is used to decide how much importance to put on the input values and should be set with care Query Format PRTHQ ITIM checksum lt cr gt lt lf gt Set Format Using a GMT time format PRTHS ITIM timeRMS GMT day month year hours minutes seconds checksum lt cr gt lt lf gt Using a GPS time format PRTHS ITIM timeRMS GPS gps_week gps_time checksum lt cr
4. SN LK D s AZM EL SN LK ID s AZM EL SN LK D s AZM EL SN LK Y 1D s AZM EL SN LK D s AZM EL SN LK cs Note designate optional sections that appear only if there is satellite data Name Description POLYS NavSync Proprietary NMEA sentence header Satellite Data GT Number of GPS satellites tracked ID Satellite PRN number 1 32 Ss Satellite status not used U used in solution e available for use but no ephemeris AZM Satellite azimuth angle range 000 359 degrees EL Satellite elevation angle range 00 90 degrees SN Signal to noise ratio in range O 55 dB Hz LK Satellite carrier lock count range O 255 seconds O code lock only 255 lock for 255 or more seconds cs Message checksum in hexadecimal 7 2 4 POLYI Additional Information Message POLYI JN jammer EXT efields INT ifields BLANK cs Note More than one efield or ifield may be present each separated by commas Name Description SPOLYI NavSync Proprietary NMEA sentence header Additional Information JN Fixed descriptor field jammer Detected Jammer to Noise Ratio dB Hz EXT Fixed descriptor field indicates the use of externally provided ancillary measurements e g received from Network Assistance All comma separated fields following up to the INT field descriptor are externally provided measurements efields DIFF Differential Inputs TSYNC Time synchronization CLKB C
5. and 10 MHz outputs 1 4 GPS Position and Timing Solution Accuracy Dilution Of Precision DOP is a measure of the satellite geometry and is an indicator of the potential quality of the solutions The lower the numerical value the better the potential accuracy for example a PDOP below 3 indicates good satellite geometry The following DOP terms are computed by FTS500 HDOP Horizontal Dilution of Precision Latitude Longitude VDOP Vertical Dilution of Precision Height TDOP Time Dilution of Precision Timing errors PDOP Position Dilution of Precision 3 D positioning GDOP Geometric Dilution of Precision 3 D position amp Time Estimated accuracy DOP x measurement accuracy While each of these terms can be individually computed they are formed from co variances and are not independent of each other For example a high PDOP will cause receiver position errors that will eventually result in increased clock errors The FTS500 is able to reduce this effect by more accurately determining the fixed antenna position with the auto survey CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page5 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 2 SPECIFICATION 2 1 Operating Specifications Parameter Minimum Typical Maximum Units Notes Mechanical Dimensions 106 x 125 x 56 mm Main Supply Vol
6. are available as a kit or can be individually purchased as needed Key features include e Stratum 1 Time Source e G 811 Compliant GPS Locked e Meets ESTI PRC Wander Generation Mask GPS Locked e Phase Locked 10 MHz Output e Low Phase Noise e Precise 1 PPS Output e Serial Input Output Port GPS Receiver e Master Reset e 8V 28V Power Supply e Commercial Temp 0 70 C e Mechanical Dimensions 106 x 125 x 56mm not including connectors e Aluminum Housing e Fixed Position Unit This document provides information on the Hardware and Software elements of the FTS500 Key information includes e Specification e Physical Characteristics e Signal Descriptions e Features e Application Information The FTS500 is available in a number of standard software builds depending on the application for which it is to be used In special cases the FTS500 may be supplied with a slightly different hardware build The specifications in this manual refer to the standard builds CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 4 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 1 DESCRIPTION continued 1 2 Global Positioning System GPS The Global Positioning System GPS is a military satellite based navigation system developed by the U S Department of De fense which is made freely available to civil users Civilian use of GPS is made a
7. cable to the serial port labeled RS232 and the remaining end to the RS232 COM port on a PC 4 Open a Terminal window or NavSync NS3Kview software on the PC with communications settings to match the COM port used and the baud rate set to 38400 default 5 Connect the power supply to the DC POWER connector 6 The unit should start streaming data through the serial port to the PC 7 Once the unit achieves lock as indicated by the LOCK LED the timing outputs will be valid CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 12 Rev 00 Date 07 20 12 O Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 7 COMMUNICATION PROTOCOLS The FTS500 outputs NMEA 0138 sentences through the serial port as well as accepts configuration commands The default configuration serial port on the FTS500 38400 baud 8 bits no parity and no handshaking The serial port baud rate can also be configured with the SPRTHS U1CM command described in Section 7 3 There are two main types of sentence Approved and Proprietary All sentences start with delimited with commas and end ing with lt CR gt lt LF gt Approved sentences are recognized by the first 5 characters after the which define both the kind of talker providing the information 2 characters GP in the case of a GPS and the type of information 3 characters Proprietary sen tences are indicated by a P following the S as the first of
8. firmware Please consult the factory For the 1PPS output to be valid the receive must have a valid position fix and have received the UTC GPS correction parameter from the satellites This may take up to 12 5 minutes from a cold start Risetime Pulsewidth gt Pulse width 100 Sec Risetime maximum 10 nSec 2 metre std lead Synch to UTC rising edge 30 nSec GDOP 3 0 no S A Output 3 3V Volt nominal Vhigh gt 3 0 v at 6mA out Viow lt 0 33 v at 6mA sink 4 5 Frequency Output The frequency output on the BNC connector labeled 10 MHz provides a 10 MHz AC coupled low jitter SINE output The frequen cy output provides a recise frequency reference that is phase aligned to the 1PPS output 4 6 LED Indicators ANT LED This indicator is Green when the current from the antenna connection is in the normal range and Red when an undercurrent open DC circuit or overcurrent gt 45mA condition occurs LOCK LED This indicator is Green when the GPS status is locked and the frequency output is valid and Red when the frequency output is in holdover If no holdover is available the LOCK LED is dark 4 7 Master Reset The FTS500 Master Reset button can be activated with a small tool through the hold near the power connector Resetting the FTS500 may be ncecessary if the antenna remains disconnected for an extended period of time The FTS500 can also be reset with the PRTHS RSET serial command See Section 7 3 4 for d
9. floating point range 59 999999 LatSec Latitude seconds floating point range 59 99999 LatH Latitude hemisphere char N or S LonDeg Longitude degrees floating point range 90 0 LonMin Longitude minutes floating point range 59 999999 LonSec Longitude seconds floating point range 59 99999 LonH Longitude hemisphere char E or W EIIHt Height of the reference marker above the current user datum reference ellipsoid in metres floating point range 18 000 0 AntHt Height of the antenna phase centre above the reference marker height defined by EIIHt above in metres floating point range 18 000 0 posRMS RMS accuracy of the input position metres floating point range O 999999 0 Note that since the Degree Minutes and Seconds fields will accept floating point values then a decimal degree value or and integer degree decimal minute value can be input directly by setting the minutes and seconds fields to zero as appropriate eg 52 12345678 0 0 N or 52 14 123456 0 N CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 21 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 7 Communication Protocols continued 7 3 6 PRTH lt Q S R gt MMSV MIN amp MAX SATELLITES FOR A POSITION SOLUTION Purpose This message Sets Queries and Responds to the minimum and maximum number of satellites the receiver will use for a
10. gt lt lf gt Response Acknowledge Format PRTHR ITIM timeRMS GMT day month year hours minutes seconds GPS gps_week gps_time lt checksum gt lt cr gt lt lf gt Explanation of Parameters ODNDOAON O time RMS RMS accuracy of the input time tag seconds floating point range O 999999 0 day day of month integer range 1 31 month month of year integer range 1 12 year 4 digit year integer range 1980 2047 hours hours of day integer range 0 23 minutes minutes of hour integer range 0 59 seconds seconds of minute floating point range O 59 999 gps week GPS week number including pre GPS roll over weeks eg 1037 integer range O 32768 gps TOW GPS Time of Week in seconds floating point range 0 0 604800 0 CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 20 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 7 Communication Protocols continued 7 3 4 PRTH lt Q S R gt RSET RESET THE RECEIVER Purpose This message Sets Queries and Responds to a receiver re set command with optional actions such as clearing specific data groups stored in the FTS500 local EEPROM The data areas that can be cleared include satellite almanacs ephemerides and receiver configuration parameters This command invokes a 2 second time out prior to the reset being called Query Format PRTHQ RSET checksum lt cr gt lt lf gt Set Form
11. position solution Increasing the minimum number of satellites will improve the accuracy achieved when sufficient satellites are available but may reduce the time when a solution can be produced Reducing the maximum number of satellites may reduce the accuracy of the position solution but will decrease the amount of processing power required for the solution Note that setting the Maximum satellites to less than 4 will prevent the receiver from performing a 3D position solution Likewise setting the minimum number of satellites greater than 3 will prevent the receiver performing a 2 D altitude fixed solution The maximum must be greater than or equal to the minimum number of satellites Query Format PRTHQ MMSV checksum lt cr gt lt lf gt Set Format PRTHS MMSV min_NSV max_NSV checksum lt cr gt lt lf gt Response Acknowledge Format PRTHR MMSV min_NSV max_NSV lt checksum gt lt cr gt lt lf gt Explanation of Parameters min_NSV Minimum Satellites used for a position time solution integer range 0 12 max_NSV Maximum Satellites used for a position time solution integer range 0 12 7 3 7 PRTH lt Q S R gt ELVM SATELLITE ELEVATION MASK Purpose This message Sets Queries and Responds to the satellite elevation mask angle below which satellite data will not be used in the navigation and time solution Query Format PRTHQ ELVM checksum lt cr gt lt lf gt Set Format PRTHS ELVM nvElevMask checksum lt cr gt lt lf
12. standard defining hardware compatibility message formats and a range of standard messages ns nSec Nanosecond one thousandth of a microsecond i e 10 second PC Personal Computer IBM compatible PDOP Position Dilution of Precision including horizontal and vertical components PPS Pulse per Second PRN Pseudo Random Noise code unique to each satellite s message and therefore used to identify each satellite Pseudo Range The apparent measured straight line distance from a satellite to the receiving antenna at any instant in time including any errors caused by satellite clocks receiver clocks refraction of the radio waves etc Resolution Smallest separation of two display elements RMS Root Mean Square RS232 Serial communication hardware standard 12v nom S A Selective Availability imposed by the DoD to limit the GPS performance available to civil users SV Satellite Vehicle us uSec Microsecond u is frequently used for the Greek u symbol denoting micro one millionth part 10 UTC Coordinated Universal Time UART Universal Asynchronous Receiver transmitter used in serial communications VDOP Vertical Dilution of Precision CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 25 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice APPENDIX 2 Contact Details For further detai
13. the 5 characters the next 3 indicating the manufacturer from a listing of mnemonic codes and the 5th character being selected by that manufacturer for the particular sentence structure Propri etary sentences must conform to the general NMEA structures but are otherwise undefined outside of the Manufacturers own documentation The following Approved messages are available from the FTS500 receiver GPGLL Geographic Position Latitude longitude GPGGA Global Positioning System Fix Data GPGSA GNSS DOP and Active Satellites GPGSV GNSS Satellites in View GPRMC Minimum required sentence GPVTG Velocity and track over ground POLYT Navsync Proprietary time of day message POLYP Navsync Proprietary status message POLYS Navsync Proprietary satellite status message GPGGA GPGSV POLYI Navsync Proprietary net assist information message 7 1 Approved NMEA Messages 7 1 1 GPGLL Geographic position Lat Lon Latitude and longitude with time of position fix and status GPGLL Latitude N Longitude E hhmmss sss Status Mode cs Name Description GPGLL NMEA sentence header Position Data Latitude User datum latitude degrees minutes decimal minutes format ddmm mmmmmm N Hemisphere N North or S South Longitude User datum longitude degrees minutes decimal minutes format dddmm mmmmmm E Longitude Direction E East or W West hhmmss sss UTC Time in hours minutes
14. within the receiver GDOP Geometrical Dilution of Precision Geoid Ellipsoid Difference between the Mean Sea Level and the separation mathematical model used to define a datum at the point of interest GHz Gigahertz one thousand MHz i e 10 Hz GMT Greenwich Mean Time similar to UTC GPS Global Positioning System GPS time Time standard for the GPS system seconds are synchronous with UTC HDOP Horizontal Dilution of Precision 1 0 Input Output Kalman Filter Mathematical process used to smooth out measurement errors of pseudo ranges and carrier phases of tracked satellites For example 8 states refers to filtering of position and time i e x y z and t and the rate of change of each knot Nautical mile per hour L1 The 1575 42 MHz frequency radiated by GPS satellites L band The band of radio frequencies between 1 and 2 GHZ mA Milliamp of current MHz Megahertz i e one million cycles per second CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 24 Rev 00 Date 07 20 12 O Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice Glossary continued MSL Mean Sea Level geoidal height 0 Multiplexing A receiver channel can track multiple satellites by switching rapidly between them so as to gather all data transmissions NMEA National Marine Electronics Association NMEA 0183 A serial communication
15. ELLITES FOR A POSITION SOLUTION ul cee 22 7 3 7 PRTH lt Q S R gt ELVM SATELLITE ELEVATION MASK ulanan 22 CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page2 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice TABLE OF CONTENTS 8 NMEA and UART Configuration Details 2 cn 23 8 1 NMEA Configuration Query PRTHQ UTCM kresie anaa ENG non cn A E EA ERa a a 23 8 2 NMEA Configuration Set SPRTHS UCM Jiraiya NAA aNG lone ae DA anG 23 8 3 UART Configuration Query PRTHQ UTE Mica GN anand nerds GAGANA AGANG 23 8 4 UART Configuration Set SRRTAQ US Mesas AG NG GANAN ARA didas 23 APPENDIX 1 Gloss aiii e 24 27 APPENDIX 2 Contact DetallS vies icciscsccisesessasisscsascncssssscessenserdenteesasiecessacncesancssassasssuscsvssnscsinsubcessuassisasesisuseesvedesessnsesessauestes 26 APPENDIX 3 World Wide Webm KATABA cnn 26 Revision HIStoN scaasiisessnescadadavenecicnntinadstesavonsseassacsanansssaensunsvduucansatideaunes sunadeacansdensudursvasccssesusddsbndsadscendcabsevueusnsavassieeauenievncens 27 CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 3 Rev 00 Date 07 20 12 O Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 1 DESCRIPTION 1 1 Introduction The FTS500 Xenith TBR Time Base Reference is the ultimate partner for your DVB DAB wireless communications time stampin
16. FTS500 G PS Available at Digi Key www digikey com Disciplined Clock User Manual Bulletin SG183 UM isi 00 Revision Date 20 July 2012 TABLE OF CONTENTS TaDESCRIPTION oir 4 5 Tal IRIFOAUENO Nkaka ganan eas ax ARA idol UN ARNAN 4 1 2 Global Positioning SYSTEM maman kaaa dia cla lames LNG DANG AG BAROK BULA dd adv n E 5 1 3 GPS Positionihg and TIMING KAG naa pik tai 5 1 4 GPS Positioning and Timing and Timing Solution Accuracy maaanaanana nananana awanannananana naanakan snnansnnasannan 5 2 SPECIFICATION ooo e donada ranas 6 9 2 1 Operating SPSCHICA OMS iii 6 2 2 Absolute MaxiMumRatiMgS vac anan ceci an de E a ENa i AEE deidad 6 223 Phase NOS dd dc 7 2 4 Xenith TBR Modified Allan DeViation cocoa aa E RE E Ei 8 2 5 Xenith TBR Wander Generation Pl Oty ss cones snsy sox aeanebocylanasweuancacutenuandandealan oh daene a4 E doen duteeanaeeeleaan 8 216 BIOCk Dia graii O AA ci san tva tana AA Ga 9 3 FTS500 Xenith TBR Front Panel s coiciiooniiioicarnian ii o ta iise 10 Bill AS232 IMS MACS iaa lado 10 4 SIGNAL DESCRIPTION ia 11 AM AA 11 4 2 Antena COMPA maa Aw Ama aap aaa a ah ha LARA pa Uh 11 43 SONA POM map AINA ah NABA GA Gb Nh 11 44 Se tilda 11 4 5 Frequency CUP 11 4 6 LED A 11 Beh Master Resep paan NANG NG EGR NAAN heh E AE NAA 11 5 FEATURES NANANA NANANA mGA NAIN ada 12 5 1 Stationary Timing RECCIVEL maana PAANAN AINT GAPAN BANANA NAA 12 5 2 Frequency Output and 1PPS Phas
17. addition the FTS500 does not currently support the use of parity or of stop bit settings other than 1 stop bit The supported baud rates are 1200 2400 4800 9600 19200 38400 57600 115200 and 230400 If the baud rate is reduced too low for the NMEA sentences configured to output data may occur CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 23 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice APPENDIX 1 Glossary 2D Two dimensional 3D Three dimensional i e including altitude Almanac Data transmitted by each satellite and which provides the approximate orbital information of all the GPS satellites constellation i e a timetable Antenna Also called Aerial the device for receiving the radio signals ASCII A standard digital format for alpha numeric characters American Standard Code for Information Interchange Baud Serial digital communication speed units bits per second Channel The satellite tracking unit of a GPS receiver One channel may track more than one satellite by multiplexing but for best performance each satellite should be continuously tracked by a dedicated channel so more than one channel is often integrated into a receiver CMOS A type of semiconductor fabrication process Complementary Metal Oxide Semiconductor resulting in low power CMOS dev
18. at PRTHS RSET option option checksum lt cr gt lt lf gt Response Acknowledge Format PRTHR RSET option option lt checksum gt lt cr gt lt lf gt A response option of NO indicates that no reset command is currently activated Explanation of Parameters option A list of character descriptors to indicate which if any of the optional actions are to be undertaken prior to the software re sets CONFIG clear the receiver configuration data stored in EEPROM EPH clear the satellite ephemeris data stored in EEPROM ALM clear the satellite almanac data stored in EEPROM 7 3 5 PRTH lt Q S R gt ILLH INITIALIZED LAT LONG HEIGHT POSITION Purpose This message Sets Queries and Responds to the initialized geodetic position latitude longitude ellipsoidal height and antenna height above the reference marker in the receiver s current user datum The position RMS accuracy is used to decide how much importance to put on the input values and should be set with care Query Format PRTHQ ILLH checksum lt cr gt lt lf gt Set Format PRTHS ILLH LatDeg LatMin LatSec LatH LonDeg LonMin LonSec LonH EIIHt AntHt posRMS checksum lt cr gt lt lf gt Response Acknowledge Format PRTHR ILLH LatDeg LatMin LatSec LatH LonDeg LonMin LonSec LonH ElIHt AntHt posRMS lt checksum gt lt cr gt lt lf gt Explanation of Parameters LatDeg Latitude degrees floating point range 90 0 LatMin Latitude minutes
19. e Alignment mmuuanawwnnaaanawanaaanaa naan awana saan ananasnasanananwasanaaarnasannanenanan 12 6 OPERATING INSTRUCTIONS aa KKK oi ii 12 7 COMMUNICATIONS PROTOCOL S Laan aaa 13 22 Tal Approved NMEA MESSAGES ivonne 13 TAA GPGLL Geographic position Lalo iaa lat N 13 11 2 GPGGA GPS Tiki ate ti O la da 14 7 1 3 GPGSA GPS DOP and Active satellites ooo nica rincon rra rr 14 7 1 4 GPGSV GPS Satellites 1M VIEW aman IGAN NAAANINAG ENNA BANNA 15 7 1 5 GPRMC Recommended Minimum lata oononinnionccncccincciocononccno nono nono rra 15 7 1 6 GPVTG Course over ground and Ground speed cciocccicccincococicionononcnno no noncnnn ronca rara rr 16 Te Proprietary NMEA Messages erat idad 16 L2A1 PORTI Time Day a Ao NANG 16 1 2 2 POLYP Position Data toaa a aa baca 17 7 23 POLYS Satellite SAUS aaa ANG vase BANANA AA a ian A A aa 18 7 2 4 POLYI Additional Information Message 7 0 7200aaaaana nanana a aa A a EN 18 13 Command Format sacarla 19 13 1 PRTH lt Q R gt VERS Software Ver unica a de cie GG 19 7 3 2 PRTH lt Q S R gt DYNA RECEIVER DYNAMICS cococccciccccocccoonononcconnonon ccoo noron nono nro rra rrar rn rra 20 1 3 3 PRTA lt QIS R gt ITIM INITIALISE TIME AND DATE Jaan aa a dde ata cacas cana cranes 20 3 4 PRIRN lt Q S R gt RSER RESET THE RECEIVER Labanan AKALA NAAANINAG aa 21 7 3 5 PRTH lt Q S R gt ILLH INITIALIZED LAT LONG HEIGHT POSITION tect e 21 7 3 6 PRTH lt Q S R gt MMSV MIN 8 MAX SAT
20. e form GLL 1 GSV 4 PLT 1 The NMEA sentence abbreviations used are selected from the complete list from the SPRTHR U1OP response Only the settings which are to be altered need to be listed This command also supports a shortcut to change the setting for all commands For example the following command disables all NMEA sentences except for POLYT PRTHS U1OP ALL 0 PLT 1 Care must be taken to avoid enabling the output of too many NMEA sentences for a given serial port baud rate or corruption of data may occur 8 3 UART Configuration Query PRTHQ U1CM The query command PRTHQ U1CM results in a response of the following form PRTHR U1CM 38400 38400 N 1 The parameter in the response 38400 38400 N 1 represent the port Tx baud rate Rx baud rate parity and stop bits respec tively Although the format of the command supports different Rx and Tx baud rates this is not currently supported by the FTS500 Consequently the Rx and Tx baud rates returned will also be identical 8 4 UART Configuration Set 6PRTHQ U1CM The set command takes the form SPRTHS U1CM 57600 57600 N 1 The parameters in the command 57600 57600 N 1 represent the port Tx baud rate Rx baud rate parity and stop bit respectively Although the format of the command supports the use of different Rx and Tx baud rates this is not currently supported by the FTS500 Consequently the Rx and Tx baud rates must always be specified to be the same value In
21. er reduced signal conditions while tracking as few as 1 SV However the receiver s antenna must have a clear view of the sky for optimum timing performance While the FTS500 is designed to maintain a GPS lock in reduced signal conditions like shallow indoor environments the published speci fications can only be accomplished with an antenna with a clear view of the sky To measure the range from the satellite to the receiver two criteria are required signal transmission time and signal reception time All GPS satellites have several atomic clocks that keep precise time and these are used to time tag the message i e code the transmission time onto the signal and to control the transmission sequence of the coded signal The receiver has an internal clock to precisely identify the arrival time of the signal Transit speed of the signal is a known constant the speed of light therefore distance time x speed of light Once the receiver calculates the range to a satellite it knows that it lies somewhere on an imaginary sphere whose radius is equal to this range If a second satellite is then found a second sphere can again be calculated from this range information The receiver will now know that it lies somewhere on the circle of points produced where these two spheres intersect When a third satellite is detected and a range determined a third sphere would intersect the area formed by the other two This intersection occurs at two points T
22. etails CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 11 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 5 FEATURES 5 1 Stationary Timing Receiver The FTS500 operates in a survey and position hold mode which allows increased accuracy for timing applications The FTS500 s default dynamics setting is 1 and changes to 0 after a 10 minute position survey is completed Refer to Section 8 3 6 for more details on the dynamics setting During operation the receiver antenna must remain stationary 5 2 Frequency Output and 1PPS Phase Alignment The FTS500 maintains phase alignment between the Frequency Output and 1PPS allowing the Frequency Output to be used as a time reference as well as a frequency reference After an initial GPS fix the phase alignment is maintained during holdover when the GPS fix is lost During recovery from holdover when the GPS fix regained the Frequency Output and 1PPS walk back to the GPS solution position at a maximum rate of 100 ns s while maintaining phase alignment between the two outputs 6 OPERATING INSTRUCTIONS pa Install the antenna in an outdoor location with a full sky view for optimum performancce Operation with degrated timing performance is also possible with antenna in partial sky view or shallow indoor locations near window 2 Connect the antenna to the BNC socket labeled ANT 3 Connect an RS232 data
23. evision Date Notes ROO 07 20 12 Released CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 27 Rev 00 Date 07 2 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without r
24. fications subject to change without notice 7 Communication Protocols continued 7 1 6 GPVTG Course over ground and Ground speed Velocity is given as Course over Ground COG and Ground Speed GPVTG cogt T cogm M knots N kph K Mode cs Name Description SGPVTG NMEA sentence header Speed and heading cogt Course over ground true T True fixed field cogm Course over ground magnetic M Magnetic fixed field knots Speed over ground knots N Knots fixed field kph Speed over ground kph K Kilometers per hour fixed field Mode Mode Indicator D Valid Differential A Valid Autonomous E Invalid Estimated N Invalid Not Valid cs Message checksum in hexadecimal 7 2 Proprietary NMEA Messages 7 2 1 POLYT Time of Day POLYT hhmmss sss ddmmyy UTC_TOW week GPS_TOW Cik_B Clk_D PG LocalTTag BAcc TAcc BLANK cs Name Description POLYT NavSync Proprietary NMEA sentence header Position Data hhmmss sss UTC Time in hours minutes seconds and decimal seconds format ddmmyy Date in day month year format UTC_TOW UTC Time of Week seconds with microseconds resolution week GPS week number continues beyond 1023 GPS_TOW GPS Time of Week seconds with microseconds resolution Clk_B Receiver clock Bias nanoseconds Clk_D Receiver clock Drift nanoseconds second PG 1PPS Granularity nanoseconds LocalTTag Local receiver time tag s
25. g or any other timing vital application The Xenith TBR module is a GPS driven mixed signal phase lock loop providing a 1 PPS CMOS output and generating a 10 MHz SINE output from an intrinsically low jitter voltage controlled crystal oscillator VCXO The 10 MHz output is disciplined from an on board GPS receiver which drives the long term frequency stability The on board GPS receiver at the core of the Xenith TBR is the highly successful and well established CW25 timing receiver This GPS engine along with a dual oven system provides the highest quality timing and synchronization signals combined with superb holdover characteristics The unit is housed in a 106x125x56mm stylishly designed strong aluminum enclosure The 10 MHz and 1 PPS signal are available on BNC connectors The antenna input is also a BNC connector and will operate a 5V active antenna The Xenith TBR requires this antenna to placed outdoors for best stability and consistent performance The Xenith TBR communicates via RS232 and can be operated and monitored through only NMEA currently supported or TSIP protocol with optional software The user can observe the status of the unit time of day position and satellite quality information via either of the two protocols The unit has a wide DC power input range between 8 and 28VDC via a secure 2 pin Molex type connector Accessories such as AC Mains adaptor all regions antenna cable high performance outdoor antenna and serial cable
26. gt Response Acknowledge Format PRTHR ELVM nvElevMask lt checksum gt lt cr gt lt lf gt Explanation of Parameters nvElevMask the navigation and time solution elevation mask angle in degrees integer range O 90 CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 22 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 8 NMEA and UART CONFIGURATION DETAILS This section describes how the NMEA and UART output can be configured for different Refresh Rates Contents and Baud Rates e NMEA Output Configuration i e output frequency Query PRTHQ U10P e NMEA Output Configuration i e output frequency Set PRTHS U10P e UART Configuration i e baud rate Query PRTHQ U1CM e UART Configuration i e baud rate Set PRTHS U1CM 8 1 NMEA Configuration Query SPRTHQ U1CM The query command SPRTHQ U1OP results in a response of the following form PRTHR U10P GLL 1 RMC 1 RMX 0 VTG 0 GGA 1 GSA 1 GSV 1 ZDA 1 PLT 1 PLP 1 PLX 0 PLS 1 PLl 1 70 The response includes a list of abbreviations for the supported NMEA sentences and their current output rate settings The out put rate is the delay in seconds between subsequent outputs of a given NMEA sentence An output rate of 0 indicates the com mand is disabled 8 2 NMEA Configuration Set SPRTHS U1CM The set command starts with SPRTHS U1OP The remainder of the command is of th
27. he correct point is apparent to the user who will at least have a very rough idea of position A fourth satellite is then used to synchronize the receiver clock to the satellite clocks In practice just 4 satellite measurements are sufficient for the receiver to determine a position as one of the two points will be unrealistic possibly many kilometers out into space This assumes the satellite and receiver timing is identical In reality wnen the FTS500 Receiver compares the incoming signal with its own internal copy of the code and clock the two will no longer be synchronized Timing errors in the satellite clocks the receiver clock and other anomalies mean that the measurement of the signals transit time is in error This effectively is a constant for all satellites since each measurement is made simultaneously on parallel tracking channels Because of this the resulting ranges calculated are known as pseudo ranges To overcome these errors the FTS500 Receiver then matches or skews its own code to become synchronous with the satel lite signal This is repeated for all satellites in turn thus measuring the relative transit times of individual signals By accurately knowing all satellite positions and measuring the signal transit times the antenna s position can be accurately determined The FTS500 then uses the local clock drift and bias terms of the GPS solution to produce GPS disciplined time and frequency refer ences 1PPS
28. ices require static protection during hanaling C No Carrier to Noise ratio a measure of signal quality COM Port Communication port e g PC serial communication ports COM1 etc Datum The reference shape of the Earth s surface used in the construction of a map or chart Usually chosen for a best fit over the area of interest and thus the Datum for various parts of the world may differ DoD U S Department of Defense DOP A DOP Dilution of Position is a figure which represents the purely geometrical contribution of the satellites positions to the total position error budget Low values of a DOP 1 5 mean that the calculated position should be good whilst higher DOP values indicate a greater uncertainty in the determined position Good DOP values are obtained when satellites are well spaced geometrically whilst poor values result from available satellites all being visible in similar directions When the DOP value is excessive e g gt 100 then neither stand alone nor differential positions should be used DR Dead Reckoning a means of estimating present position based on a known starting position updated by applying distance and direction of the user s movements Ellipsoidal Height as defined from the Earth s centre by a reference ellipsoid model see Datum Height Ephemeris Similar to Almanac but providing very accurate orbital data of each individual satellite and transmitted by the satellite concerned Firmware Program resident
29. ince start up msec BAcc Bias Accuracy TAcc Time Accuracy cs Message checksum in hexadecimal CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 16 Rev 00 Date 07 20 12 O Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 7 Communication Protocols continued 7 2 2 POLYP Position Data POLYPhhmmss sss Latitude N Longitude E AltRef FS Hacc Vacc SOG COG V_vel ageC HDOR VDOP PDOP G DOP TDOPGU RU DR cs Name Description SPOLYP NavSync Proprietary NMEA sentence header Position Data hhmmss sss UTC Time in hours minutes seconds and decimal seconds format Latitude User datum latitude degrees minutes decimal minutes format ddmm mmmmmm N Hemisphere N North S South Longitude User datum longitude degrees minutes decimal minutes format dddmm mmmmmm E Longitude Direction E East W West AltRef Altitude meters above user datum ellipsoid FS Fix Status NF No Fix DR Predictive Dead Reckoning solution DA Predictive Dead Reckoning solution with DR aiding G1 Partial GPS solution with DR aiding G2 Stand alone 2D solution G3 Stand alone 3D solution D1 Partial Differential GPS solution with DR aiding D2 Differential 2D solution D3 Differential 3D solution Hacc Horizontal 2 sigma accuracy estimates O to 99999 meters Vacc Vertical 2 sigma accuracy estima
30. lock Bias FREQ Frequency of reference oscillator HPOS Horizontal position VPOS Vertical Position altitude VVEL Vertical Velocity DIST Distance Moved SPEED Current Speed TRACK Current track DTRACK Delta track change in direction INT Fixed descriptor field indicates the use of internally provided ancillary measurements e g retrieved from non volatile memory All comma separated fields following are internally provided measurements ifields TSYNC Time synchronization CLKB Clock Bias FREQ Frequency of reference oscillator HPOS Horizontal position VPOS Vertical Position altitude VVEL Vertical Velocity DIST Distance Moved SPEED Current Speed TRACK Current track DTRACK Delta track change in direction BLANK Reserved for future use cs Message checksum in hexadecimal CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 18 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 7 Communication Protocols continued 7 3 Command Format The FTS500 has a unique set of proprietary commands Commands will only be accepted on Port 1 The commands to and from the unit have the following general formats PRTH lt QISIR gt lt id gt lt msg fields gt lt checksum gt lt cr gt lt lf gt Where lt Q S R gt is the single ASCII character as follows Q Command to Query the FTS500 S Command t
31. ls and hot line support please contact North American Sales The Connor Winfield Corporation 2111 Comprehensive Dr Aurora IL 60505 USA Telephone 1 630 851 4722 Fax 1 630 851 5040 International Sales and Support The Connor Winfield Corporation Europe BAY 143 Shannon Industrial Estate Shannon Co Clare Ireland Telephone 353 61 472221 Facsimile 353 61 472226 APPENDIX 3 World Wide Web Information There are several GPS related sites on the World Wide Web www that are excellent sources to obtain further information about GPS and the current status of the satellites U S Coast Guard Navigation Center Civilian GPS service notices general system information and GPS outage reporting www navcen uscg gov U S Naval Observatory General USNO information and links to USNO timing and other useful sites www usno navy mil General GPS Information and links to other useful GPS sites USAF GPS Wing www losangeles af mil National Marine Electronics Association NMEA For information on the NMEA protocol specification www nmea org General GPS Information Glossary of GPS terms www gpsworld com resources glossary htm CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 26 Rev 00 Date 07 20 12 O Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice FTS500 GPS Available at Digi Key Disciplined Clock User Manual Revision R
32. n Number Version Date Version Time Serial Num BB Releaset lt checksum gt lt cr gt lt lf gt Explanation of Parameters Build Name Product name i e FTS500 TIM or FTS500 NAV Version Number Software version number Version_Date Software build date in Mmm_dd_yyyy format where Mmm is the Three character abbreviation of the month name Version_TimeSoftware build time in hh mm ss format Serial Num Product serial number is current not implemented and always outputs Serial_Num BB_Release Baseband version number CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 19 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 7 Communication Protocols continued 7 3 2 PRTH lt Q S R gt DYNA RECEIVER DYNAMICS Purpose This message Sets Queries and Responds to the receiver host dynamics and hence the maximum receiver tracking dynamics expected The degree of filtering performed by the navigation and timing Kalman filter is dependant on the selected receiver platform Query Format PRTHQ DYNA checksum lt cr gt lt lf gt Set Format PRTHS DYNA platform checksum lt cr gt lt lf gt Response Acknowledge Format PRTHR DYNA platform lt checksum gt lt cr gt lt lf gt Explanation of Parameters platform receiver platform integer range 0 10 Fixed base station Timing and Frequency modes etc Stationary but unknown position Man pack
33. nder Plot CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 8 Rev 00 Date 07 20 12 O Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 2 SPECIFICATION continued 2 6 Block Diagram GPS ANTENNA CW25 TIM GPS RECEIVER OCXO REFERENCE Xenith TBR Module CONNOR WINFIELD RS232 ANALOG FILTER DRIVER amp TRANSLATION Figure 4 Block Diagram SG183 FTS500 Xenith TBR User Manual Page9 SERIAL OUTPUT 1 PPS CMOS OUTPUT HOLDOVER LOCK STATUS ANTENNA FAULT STATUS 10 MHz SINE OUTPUT Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 3 FTS500 Xenith TBR Front Panel Figure 5 O DC POWER 10 MHz 1 PPS RS232 y MOE a O 9 0000 O Figure 2 FTS500 Front Panel FTS500 Xenith TBR Connector Information Connector Name Description BNC RF IN Antenna input Provides 5Vdc for active antenna Max current draw 45mA 10 MHz High performance 10 MHz reference signal 1 PPS High accuracy 1 pulse per second signal DB9 F RS232 ASCII NMEA or TSIP for monitoring and configuration Molex Power 8 28vdc Input mates with 2 Way Mini Fit Jr Molex connector Mating PN 39 01 3022 3 1 RS232 Interface The RS232 Interface to the FTS500 is a DB9 F connector The details of the interface connections are given below Pin Function
34. o Set the FTS500 configuration R Response to a PRTH Query or an acknowledgement of a PRTH Set lt id gt is a 4 character command identifier lt msg fields gt are the message fields for the message and are all positional Optional or unknown fields are shown as nulls ie adjacent commas Trailing commas to the end of a message ie nothing but null message fields are not required lt checksum gt An optional checksum byte for checking accuracy defined as follows The checksum is displayed as a pair of ASCII characters 0 9 and A F inclusive whose value represents the HEX value of the checksum byte When used it always appears as the last field of the sentence and is prefixed by field delimiter HEX 2A instead of and followed by lt CR gt lt LF gt HEX OD 0A The checksum value is calculated by XOR ing exclusive OR ing also known as Modulo 2 Sum the 8 binary data bits of each valid data character in the sentence between the HEX 24 and HEX 2A characters The HEX 24 and the HEX 2A characters are not included in the checksum lt cr gt lt lf gt are the ASCII codes ODh and OAh carriage return and line feed respectively 7 3 1 PRTH lt Q R gt VERS Software Version Purpose This message Queries and Responds with the current software version information Query Format PRTHQ VERS checksum lt cr gt lt lf gt Response Acknowledge Format SPRTHR VERS Build Name Versio
35. oMsg Total number of GPGSV messages being output MsgNo Number of this messages NoSv Number of satellites in view sv Satellites ID elv Satellite elevation angle degrees az Satellite azimuth angle degrees cno Satellite signal Noise ration dB Hz cs Message checksum in hexadecimal 7 1 5 GPRMC Recommended Minimum data The Recommended Minimum sentence is defined by NMEA for GPS Transit system data GPRMC hhmmss sss status latitude N Hemisphere longitude E spd cmg ddmmyy mv mvd Mode cs Name Description GPRMC NMEA sentence header Recommended Minimum Sentence hhmmss sss UTC Time in hours minutes seconds status Status V navigation receiver warning A data valid Latitude User datum latitude degrees minutes decimal minutes format ddmm mmmmmm N Hemisphere N North or S South Longitude User datum longitude degrees minutes decimal minutes format dddmm mmmmmm E Longitude Direction E East W West spd Speed over ground knots cmg Course made good ddmmyy Date in Day Month Year format mv Magnetic variation mvd Magnetic variation direction Mode Mode Indicator D Valid Differential A Valid Autonomous E Invalid Estimated N Invalid Not Valid cs Message checksum in hexadecimal CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 15 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Speci
36. rp All Rights Reserved Specifications subject to change without notice 2 SPECIFICATION continued 2 3 Phase Noise Offset Frequency Hz Typical dBc Hz 10 115 100 135 1k 143 10k 148 100k 152 1M 153 Xenith TBR 10 MHz SINE Output Lor dBc Hz o T 10 20 30 40 Lock on Freq RF Gain 90dB Fnarker Ucontrol 2 250U Freq LO OdBc 0 385U rd Lmarkerz CONNOR WINFIELD Figure 1 Phase Noise SG183 FTS500 Xenith TBR User Manual Page7 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 2 SPECIFICATION continued 2 4 Xenith TBR Modified Allan Deviation Dale DI 05 10 Time 14 38 81 FREQUENCY sT ABI LITY Modified Akon Des atio pa FTS375 Modified Alan Deviation e7 J Tou Sigma q gt 5 63e 02 1 84e 09 o 1138 01 6 53e 10 mo H 2 25e 01 2 32e 10 Sa 4 50e D1 8 76e 11 So 19 00e 01 4 87e 11 180e 00 4 23e 11 Pi 13 60e 00 3 82e 11 tA 7 20e 00 3 40e 11 Hr 144e401 2 53e 11 8 1 2 88e 01 174e 11 Be 15 76e 01 1188 11 DO E 33 115e4 02 9 94e 12 A 2 30e 02 3 59e 12 E lt y Ei E 107 10 10 10 103 Averaging Time T Seconds 5 i Matias Figure 1 Phase Noise 2 5 Xenith TBR Wander Generation Plot MTIE 10000 1000 E w 100 53 10 1 0 1 10 10 0 100 0 1000 0 100000 Observation Interval sec Figure 2 Wa
37. seconds and decimal seconds format Status StatusV navigation receiver warning A data valid Mode Mode indicator A Valid Autonomous D Valid Differential E Invalid Estimated N Invalid Not valid Cs Message checksum in hexadecimal CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 13 Rev 00 Date 07 20 12 O Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 7 Communication Protocols continued 7 1 2 GPGGA GPS fix data Time and position together with GPS fixing related data SGPGGA hhmmss sss Latitude N Longitude E FS NoSV HDOP Altref M msl M DiffAge DiffStation cs Name Description GPGGA NMEA sentence header Position Data hhmmss sss UTC Time in hours minutes seconds and decimal seconds format Latitude User datum latitude degrees minutes decimal minutes format ddmm mmmmmm N Hemisphere N North or S South Longitude User datum longitude degrees minutes decimal minutes format dddmm mmmmmm E Longitude Direction E East W West FS Fix Status O No fix 1 Standard GPS 2 Differential GPS NoSv Number of satellites used in the position solution HDOP 2 D Horizontal Dilution of Precision 0 00 to 99 99 AltRef Altitude meters above user datum ellipsoid M Units of height meters msl Mean Sea Level M Units of Mean Sea Level meters DiffAge Age of differential correction
38. tage 8 24 28 Vdc Operating Temperature 0 70 C Power Consumption initial power up tiz 12 Watts Power Consumption continuous mode 4 41 5 Watts GPS Voltage for Active Antenna Vdc 4 8 5 0 Sel V Current Draw for Antenna 45 mA GPS Channels 12 Tracking Sensitivity 156 dBm Acquisition Sensitivity 155 dBm GPS Acquisition Time 150 sec Update Rate 1 Hz 1 0 Communications Protocol NMEA 0183 TSIP Electrical RS232 Timing Signals 1PPS CMOS Pulse Amplitude 3 3 Vdc Pulse Width 100 uS Accuracy RMS 30 nS Timing Signals 10Mhz Sine wave Impedance 50 Ohm Power 9 dBm Total Harmonic Distortion 2 2 Compliant Specifications G 811 Compliant GPS Locked G 812 Holdover Compliant ESTI PRC Wander Mask GPS Locked Table 1 FTS500 Specification 2 2 Absolute Maximum Ratings Parameter Minimum Maximum Units Notes Input DC Voltage 0 3 30 5 V 1 Operating Temperature 30 80 26 1 Table 2 Absolute Maximum Ratings NOTES 1 Stresses beyond those listed under Absolute Maximum Rating may cause permanent damage to the module These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under Operating Specifications is not implied Exposure to absolute maximum rated conditions for extended periods may affect device reliability CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page6 Rev 00 Date 07 20 12 O Copyright 2012 The Connor Winfield Co
39. tes O to 99999 meters SOG Speed Over Ground knots 0 000 to 999 999 knots COG Course Over Ground true in degrees 0 00 to 359 99 degrees V vel Vertical positive Up velocity m s 0 000 to 999 999 m s ageC Age of most recent DGPS Corrections applied seconds 00 00 to 99 99 none available HDOP 2 D Horizontal Dilution of Precision 00 00 to 99 99 VDOP Vertical Dilution of Precision 00 00 to 99 99 PDOP 3 D Position Dilution of Precision 00 00 to 99 99 TDOP Time Dilution of Precision 00 00 to 99 99 GU Number of GPS satellites used in the navigation solution RU Number of GLONASS satellites used in the navigation solution DR Dead Reckoning aiding status bits in ASCII Hex bit O Altitude Position Aiding applied bit 1 Vertical Velocity Aiding applied bit 2 GPS GLONASS time difference aiding applied bit 3 External Distance travelled input used bit 4 External Speed input used bit 5 External Track input used bit 6 External Delta Track input used bit 7 8 Reserved for future use cs Message checksum in hexadecimal CONNOR WINFIELD SG183 FTS500 Xenith TBR User Manual Page 17 Rev 00 Date 07 20 12 Copyright 2012 The Connor Winfield Corp All Rights Reserved Specifications subject to change without notice 7 Communication Protocols continued 7 2 3 POLYS Satellite Status POLYS GT ID s AZM EL SN LK ID s AZM EL SN LK ID s AZM EL SN LK ID s AZM EL SN LK ID s AZM EL SN LK D s AZM EL SN LK D s AZM EL
40. vailable at the user s own risk subject to the prevailing DoD policy or limitations and to individuals understanding of how to use the GPS In today s satellite constellation there are a minimum of 24 operational satellites plus several operational spares in 6 orbital planes at an altitude of about 22 000 km The GPS system can give accurate 3D position velocity time and frequency 24 hours a day anywhere around the world GPS satellites transmit a code for timing purposes and also a Navigation message which includes their exact orbital lo cation and system integrity data Receivers use this information together with data from their internal almanacs to precisely establish the satellite location The receiver determines position by measuring the time taken for these signals to arrive At least three satellites are required to determine latitude and longitude if your altitude is known e g a ship at sea and at least a fourth to obtain a 3D fix 1 3 GPS Positioning and Timing The FTS500 Receiver must be able to see at least 4 satellite vehicles SV s to obtain a 3D position fix After the FTS500 has a 3D fix a 10 minute auto survey is started to more precisely determine the fixed position of the antenna When the 10 minute auto survey completes the FTS500 fixes its position solution and is able to provide a timing solution with increased accuracy Also with the auto survey complete the FTS500 is able to maintain a GPS fix und
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