GPS Engine Board User Manual
Contents
1. Main power input Supply Current Backup Power L1 1575 42 MHz 1 023 MHz chip rate 20 channels all in view tracking 159 dBm typical lt 10 meters 2D RMS lt 7 meters 2D RMS WAAS corrected 1 5 meters DGPS corrected microsecond synchronized to GPS time WGS 84 l sec average 38 sec average 42 sec average 0 1 sec average lt 18 000 meters 60 000 feet lt 515 meters sec 1000 knots lt 4G 20 meters sec max 3 0 5 5 VDC input lt 40 mA 3V rechargeable Lithium battery up to 500 hours discharge 3 SR 87 GPS Engine Board Manual Pro Gin 2 1 8 RF Interface Antenna connector type MMCX 2 1 9 Serial Port Electrical interface Two full duplex serial communication via RS232 TTL interface Protocol message NMEA 0183 Default NMEA GGA GSA GSV RMC GLL VTG and ZDA optional 4800 baud rate other rate optional 8 bits data 1 stop bit no parity Antenna Status sentence ZANTAX ZANTA Optional 2 1 10 Time IPPS Pulse Pulse duration lus Time reference at the pulse positive edge Synchronized to GPS time lus 2 1 11 Weight lt 8g 2 1 12 Recommended External Antenna Specification Gain 20 dB min cable loss included Noise figure 1 5 dB typical Current 10 mA typical Operating Voltage Confirmed to spec 3 3 5 5 V Survival 3 0 3 3 V 2 2 Environmental Characteristics Operating temperature range 40 C to 85 C Storage temperature range 45 C to 100 C 4 SR 87 GPS Engine2. Board Manual Pro Gin 2 3 Physical Characteristics Mechanical Outline SR 87V outline Q 5 SR 87 GPS Engine Board Manual Pro Gin SR 87H outline 10 ATA qe Unit mm Pin assignment Pin6 TIMEMARK TIMEMARK 1PPS Time mark output Pulse duration 1us RESET RESET Reset Input Active Low GPS STATUS For GPS status LED indication 6 SR 87 GPS Engine Board Manual Pro Gin 3 Applications The SR 87 series engine module 1s a high performance ultra low power consumption GPS receiver Applications are as follows Car Navigation Wrist Watch Solar Operated Device Marine Navigation Fleet Management AVL and Location Based Services Radar detector with GPS function Hand Held Device for Personal Positioning and Navigation Ideal for PDA Pocket PC and Other Computing Devices at GPS Application 4 Operation and Test optional The customers can change the data protocol and communication data baud rate for their applications using a GPS Viewer software Installing appropriate viewer program to host device you may check the status of the GPS receiver whenever you like to Following are standard buttons and operation steps a Execute the Viewer program Press the COM button to set Com Port for this data link and Baud Rate to 4800 b Click OPEN to download the received data Usually one window shows the NMEA format data stream and another wind
3. GPS Engine Boar R 87 SiRF Star I V1 2 User Manual IWASHI Website www progin com tw E mail info progin com tw Pro Gin Contents A TER OQUCHION seine es case sea SARA 0 2 Lil OVERVIEW aa es ae cesse ane css coachs een 2 Ze Technical Specifications a ea des teen ce 3 2 1 lec irical Characteristics dictara des ses dna doin 3 2 2 Environmental CharacteristiCS sissies siccccwasessnccstesesaeviecasadecessnrateowtas 4 2d Physical CHAFACEOCISUOS En cena cs pedos 5 De PP DMCAUIONS serran r E AEE E E 7 4 Operation and Test Optional ccccccscsscccscccscsces 7 Appendix Antenna Status sentence sessssossosososeosesescesessesoee 8 Appendix Software Specifications oooooconcccnccncccnccnncocnconccnoss 9 SR 87 GPS Engine Board Manual Pro Gin 1 Introduction 1 1 Overview Product Introduction The ProGin SR 87 series GPS modules incorporates high sensitivity high performance SiRF Star II chipset solution in a compact design The module tracks up to 20 satellites at a time while offering fast time to first fix and 1Hz navigation update The unit is very suitable for broad applications such as Handheld PDA PPC or other battery operated navigation system Main Features High sensitivity SiRF Star II chipsets High performance receiver tracks up to 20 satellites TTL output for GPS command interface Low power consumption Average C
4. SAS PT Age in seconds Blank Null fields when Diff Ref Station ID 0000 e fe IT 1 Only apply to NMEA version 2 3 and later in this NMEA message description 2 SiRF does not support geoid corrections Values are WGS84 ellipsoid heights 10 SR 87 GPS Engine Board Manual Pro Gin GPGLL This message transfers geographic position latitude longitude and time Following is an example GPGLL 3723 2475 N 12158 3416 W 161229 487 A A 41 The GPGLL message structure is shown below Field Message ID Latitude N S Indicator Longitude E W indicator UTC Time Status Mode Checksum lt CR gt lt LF gt GPGLL UN GLL protocol header A Autonomous D DGPS E DR Only present in NMEA version 3 00 Message terminator SR 87 GPS Engine Board Manual Pro Gin GPGSA This message transfers DOP and active satellites information Following is an example GPGSA A 3 07 02 26 27 09 04 15 1 8 1 0 1 5 33 The GPGSA message structure is shown below Message ID GPGSA DS GSA protocol header M Manual forced to operate in selected 2D Mode or 3D mode A Automatic switching between modes Fix not available Mode 2D position fix 3D position fix Satellites Used Satellites Used Satellites Used 2 PDOP HDOP VDOP Checksum lt CR gt lt LF gt 1 Satellites used in solution 12 SR 87 GPS Engine Board Manual Pro Gin GPGSV This message t
5. ers UTC Time and Date Following 1s an example GPZDA 181813 14 10 2003 00 00 4F The GPZDA message format is shown below Message ID GPZDA I ZDA protocol header Either using valid IONO UTC or estimated from default leap seconds UTC Time 181813 17 SR 87 GPS Engine Board Manual
6. hannel of the beacon being used if a multi channel beacon receiver is used 1 Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description 14 SR 87 GPS Engine Board Manual Pro Gin GPRMC This message transfers recommended minimum specific GNSS data Following is an example GPRMC 161229 487 A 3723 2475 N 12158 3416 W 0 13 309 62 120598 10 The GPRMC message format is shown below Message ID GPRMC I RMC protocol header UTC Time 161229 487 a hhmmss sss Status A A Data valid or V Data invalid EE EE AN Nese Toae isso aimmmmmm Due mom emmm EE IN E CCT E CO Anns EGS EDR fem ET A om EE IS A CTC 1 SiRF does not support magnetic declination All course over ground data are geodetic WGS84 directions 2 Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description 15 SR 87 GPS Engine Board Manual Pro Gin GPVTG This message transfers velocity course over ground and ground speed Following is an example GPVTG 309 62 T M 0 13 N 0 2 K A 23 The GPVTG message format is shown below y 1 SiRF does not support magnetic declination All course over ground data are geodetic WGS84 directions 2 Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description 16 SR 87 GPS Engine Board Manual Pro Gin GPZDA This message transf
7. ith a character and terminating with a lt CR gt lt LF gt sequence NMEA standard messages commence with GP then a 3 letter message identifier The message header is followed by a comma delimited list of fields optionally terminated with a checksum consisting of an asterix and a 2 digit hex value representing the checksum There is no comma preceding the checksum field When present the checksum is calculated as a bitwise exclusive of the characters between the and As an ASCII representation the number of digits in each number will vary depending on the number and precision hence the record length will vary Certain fields may be omitted if they are not used in which case the field position is reserved using commas to ensure correct interpretation of subsequent fields 2 SR 87 GPS Engine Board Manual Pro Gin GPGGA This message transfers global positioning system fix data Following is an example GPGGA 161229 487 3723 2475 N 12158 3416 W 1 07 1 0 9 0 M 0000 18 The GPGGA message structure is shown below Mesem E CT SES ECO CCT fs ES E aO EL CR ET Tose aa fatima ER ju CT 0 Fix not available or invalid 1 GPS SPS mode fix valid Position Fix Indictor 1 2 Differ GPS SPS mode fix valid 3 5 Not supported 6 Dead Reckoning Mode fix valid amewa CA E mor qu pwstannie se Mer anim e atose mean ele easa Meer Separation tom Goias cane bia CO
8. old Start time under 42 seconds On chip 1Mb SRAM Reacquisition time 0 1 second Support accurate 1PPS output signal aligned with GPS timing Support Standard NMEA 0183 and SiRF Binary protocol Multi path mitigation hardware Built in a lithium battery enables fast positioning Compact size 25 4x25 4x7 mm for easy integration into hand held devices The SR 87 design utilizes the latest surface mount technology and high level circuit integration to achieve superior performance while minimizing dimension and power consumption This hardware capability combined with software intelligence makes the board easy to be integrated and used in all kinds of navigation applications or products The module communicates with application system via RS232 TTL level with NMEA 0183 protocol Ordering information SR 87V P Vertical MMCX input with 1PPS Time mark output SR 87V S Vertical MMCX input with GPS status indication SR 87H P Horizontal MMCX input with 1PPS Time mark output SR 87H S Horizontal MMCX input with GPS status indication 2 SR 87 GPS Engine Board Manual Pro Gin 2 Technical Specifications 2 1 Electrical Characteristics 2 1 1 General Frequency C A code Channels 2 1 2 Sensitivity Tracking 2 1 3 Accuracy Open Sky Position Time 2 1 4 Datum Default 2 1 5 Acquisition Rate Hot start Warm start Cold start Reacquisition 2 1 6 Dynamic Conditions Altitude Velocity Acceleration Jerk 2 1 7 Power
9. ow shows tracked satellite constellation and signal quality status c Once the link is successful click CLOSE button to exit the program However you may click the Cold button to perform cold start testing 7 SR 87 GPS Engine Board Manual Pro Gin Appendix Antenna Status sentence Optional For SR 87 ZANTAX ZANTAX 0 0 0 0 xx Message Message ID Antenna Port Reserved Reserved Reserved Checksum Es SZANTAX lt CR gt lt LF gt o antenna status Message for ASCII 13 0 external antenna normal Reserved Reserved Reserved specified user ASCII 10 1 external antenna open short For SR 87 S ZANTA ZANTA 0 0 0 0 xx Message Message ID Antenna Port Reserved Reserved Reserved Checksum terminator E antenna status Message for ASCII 13 0 external antenna normal Reserved Reserved Reserved specified user ASCII 10 1 external antenna open short 8 SR 87 GPS Engine Board Manual Pro Gin Appendix Software Specifications NMEA Protocol The SR 87 software 1s capable of supporting the following NMEA message formats specifically developed and defined by SiRF SGPGGA SGPGLL SGPGSA SGPGSV GPMSS frequency etc GPRMC Recommended minimum specific GNSS data GPVTG Speed and course over ground SGPZDA Radio beacon signal to noise ratio signal strength General NMEA Format The general NMEA format consists of an ASCII string commencing w
10. ransfers information about satellites in view The GPGSV message structure is shown below Each record contains the information for up to 4 channels allowing up to 12 satellites in view In the final record of the sequence the unused channel fields are left blank with commas to indicate that a field has been omitted Following is an example GPGSV 2 1 07 07 79 048 42 02 51 062 43 26 36 256 42 27 27 138 42 71 GPGSV 2 2 07 09 23 313 42 04 19 159 41 15 12 041 42 41 The GPGSV message structure is shown below CR ET IT NS for tro tis carey NS amet UT SNS Azimuth 048 Azimuth of satellite range 0 to 359 Message number Satellites in view Satellite ID Elevation SNR C No Satellite ID Elevation Azimuth SNR C No Satellite ID Elevation Azimuth SNR C No Satellite ID Elevation Azimuth SNR C No Checksum lt CR gt lt LF gt cm olhe ge 010359 o IO CNEA UT ESOS opeen SNS nO TS IUT min olhe rang 01350 Range 019 ll wen cine D eme OO 138 Azimuth of satellite range 0 to 359 Range 0 to 99 null when not tracking 1 Depending on the number of satellites tracked multiple messages of GSV data may be required 15 SR 87 GPS Engine Board Manual Pro Gin GPMSS This message transfers information about radio beacon signal to noise ratio signal strength frequency etc Following is an example GPMSS 55 27 318 0 100 1 57 The GPMSS message format is shown below Conme Naber 1 The c
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