SiRFstarIIeLP Evaluation Kit User's Guide
Contents
1. 2 2 Table 2 2 Set Serial Port Data Format 2 3 Table 2 3 Navigation Initialization Data Format 2 3 Table 2 4 Reset Configuration Non SiRFLoc Platforms 2 4 XV Table 2 5 Table 2 6 Table 2 7 Table 2 8 Table 2 9 Table 2 10 Table 2 11 Table 2 12 Table 2 13 Reset Configuration SIRFLoc Specific 2 4 Set DGPS Port Data Format 2 4 Query Rate Control Data Format See example 1 2 5 Messages ut ach See ae dha sailed 2 5 LLA Navigation Initialization Data Format 2 6 Reset Configuration 2 6 Development Data On Off Data Format 2 7 Select Datum Data Format 2 7 Data Format 2 8 NMEA Reference Manual December 2002 Preface All SiRF product support a subset of the NMEA 0183 standard for interfacing marine electronic devices as defined by the National Marine Electronics Association The NMEA Reference Manual provides details of NMEA messages developed and defined by SiRF It does not provide information about the complete NMEA 0183 Interface standard Who Should Use This Guide This manual was written assuming the user has a basic understanding of interface protocols and their use How This Guide2. Reference Manual C Un 7 r1 NMEA Reference Manual SiRF Technology Inc 148 East Brokaw Road San Jose CA 95112 U S A Phone 1 408 467 0410 Fax 1 408 467 0420 www SiRF com 1050 0042 December 2002 Revision 1 0 SiRF the SiRF logo and SiRFstar identity are registered trademarks of SiRF Technology Inc This document contains information on a product under development at SiRF The information is intended to help you evaluate this product SiRF reserves the right to change or discontinue work on this product without notice NMEA Reference Manual 2002 SiRF Technology Inc All rights reserved No part of this work may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying and recording or by any information storage or retrieval system without the prior written permission of SiRF Technology Inc unless such copying is expressly permitted by United States copyright law Address inquiries to Legal Department SiRF Technology Inc 148 East Brokaw Road San Jose California 95112 United States of America About This Document This document contains information on SiRF products SiRF Technology Inc reserves the right to make changes in its products specifications and other information at any time without notice SIRF assumes no liability or responsibility for any claims or damages arising out of the use of this document or from the use of integrated circ
3. are cleared and a cold start is performed 0x08 No initialization data is used Internal RAM is cleared and a factory reset is performed This command is used to control the serial port used to receive RTCM differential corrections Differential receivers may output corrections using different communication parameters If a DGPS receiver is used which has different communication parameters use this command to allow the receiver to correctly decode the data When a valid message is received the parameters are stored in battery backed SRAM and then the receiver restarts using the saved parameters Table 2 6 contains the input values for the following example Set DGPS Port to be 9600 8 N 1 PSRF102 9600 8 1 0 12 Table 2 6 Set DGPS Port Data Format Name Example Units Description Message ID PSRF102 PSRF102 protocol header NMEA Reference Manual December 2002 No II Table 2 6 Set DGPS Port Data Format Name Example Units Description Baud 9600 4800 9600 19200 38400 DataBits 8 8 7 StopBits 1 0 1 Parity 0 O None 1 Odd 2 Even Checksum 12 lt CR gt lt LF gt End of message termination 103 Query Rate Control This command is used to control the output of standard NMEA messages GGA GLL GSA GSV RMC and VTG Using this command message standard NMEA messages may be polled once or setup for periodic output Checksums may also be en
4. messages are provided by the next sections of this chapter Table 1 2 provides a summary of supported 51 NMEA output messages by the specific SiRF platforms Table 1 2 Supported NMEA output messages SiRF Software Options Message GSW2 SiRFXTrac SiRFLoc GGA Yes Yes Yes GLL Yes Yes Yes GSA Yes Yes Yes GSV Yes Yes Yes MSS Yes No No RMC Yes Yes Yes VTG Yes Yes Yes 1 1 III GGA Global Positioning System Fixed Data Table 1 3 contains the values for the following example GPGGA 161229 487 3723 2475 N 12158 3416 W 1 07 1 0 9 0 M 0000 18 Table 1 3 GGA Data Format Name Example Units Description Message ID GPGGA GGA protocol header UTC Time 161229 487 hhmmss sss Latitude 3723 2475 ddmm mmmm N S Indicator N N north or S south Longitude 12158 3416 dddmm mmmm E W Indicator w E east or W west Position Fix Indicator 1 See Table 1 4 Satellites Used 07 Range 0 to 12 HDOP 1 0 Horizontal Dilution of Precision MSL Altitude 9 0 meters Units M meters Geoid Separation meters Units M meters Age of Diff Corr second Null fields when DGPS is not used Diff Ref Station ID 0000 Checksum 18 CR lt LF gt End of message termination 1 SiRF Technology Inc does not support geoid corrections Values are WGS84 ellipsoid heights Table 1 4 Position Fix Indicator Value Description 0 Fi
5. 12 PDOP 1 8 Position Dilution of Precision HDOP 1 0 Horizontal Dilution of Precision VDOP 1 5 Vertical Dilution of Precision Checksum 33 CR lt LF gt End of message termination 1 Satellite used in solution Table 1 7 Mode 1 Value Description M Manual forced to operate in 2D or 3D mode A 2DAutomatic allowed to automatically switch 2D 3D Table 1 8 Mode 2 Value Description 1 Fix Not Available 2 2D lt 4SV s used 3 3D 23SV s used 1 3 III GSV GNSS Satellites in View Table 1 9 contains the values for the following example GPGS V 2 1 07 07 79 048 42 02 51 062 43 26 36 256 42 27 27 138 42 71 GPGS V 2 2 07 09 23 313 42 04 19 159 41 15 12 041 42 41 Table 1 9 GSV Data Format Name Example Units Description Message ID GPGSV GSV protocol header Number of Messages 2 Range 1 to 3 Message Number 1 Range 1 to 3 Satellites in View 07 Satellite ID 07 Channel 1 Range 1 to 32 Elevation 79 degrees Channel 1 Maximum 90 Azimuth 048 degrees Channel 1 True Range 0 to 359 SNR C No 42 dBHz Range 0 to 99 null when not tracking Satellite ID 27 Channel 4 Range 1 to 32 Elevation 27 degrees Channel 4 Maximum 90 Azimuth 138 degrees Channel 4 True Range 0 to 359 SNR C No 42 dBHz Range 0 to 99 null when not tracking Checksum 71 CR lt LF gt of message termination 1 Depending on the number of satellites tracked
6. 178 32 Table 2 12 Select Datum Data Format Name Example Units Description Message ID PSRF106 PSRF106 protocol header Datum 178 21 WGS84 178 TOKYO_MEAN 179 TOKYO_JAPAN 180 TOKYO_KOREA 181 TOKYO_OKINAWA Checksum 32 CR lt LF gt End of message termination 2 MSK MSK Receiver Interface Table 2 13 contains the values for the following example GPMSK 318 0 A 100 M 2 45 Table 2 13 RMC Data Format Name Example Units Description Message ID GPMSK MSK protocol header Beacon Frequency 318 0 kHz Frequency to use Auto Manual Frequency A A Auto Manual Beacon Bit Rate 100 Bits per second Auto Manual Bit Rate M A Auto M Manual Interval for Sending MSS 2 sec Sending of MSS messages for status 1 If Auto is specified the previous field value is ignored 2 When status data is not to be transmitted this field is null Note The NMEA messages supported by the Evaluation Receiver does not provide the ability to change the DGPS source If you need to change the DGPS source to internal beacon then this must be done using the SiRF binary protocol and then switched to NMEA 2 8 NMEA Reference Manual December 2002 ADDITIONAL AVAILABLE PRODUCT INFORMATION PartNumber Description Product Inserts SiRFstarlle LP Evaluation Kit SiR
7. 2 1 NMEA Input Messages 2 2 100 SetSerialPott seen nr rm ans Cg d 2 2 101 NavigationInitialization 2 3 102 SetDGPSPort 2 4 vi 103 Query Rate Control 2 5 104 LLANavigationInitialization 2 6 105 Development Data On Off 2 7 106 Select Datum 2 7 MSK MSK Receiver Interface 2 8 NMEA Reference Manual December 2002 Figures xiii xiv NMEA Reference Manual December 2002 Tables Table 1 1 NMEA Output Messages 1 1 Table 1 2 Supported NMEA output messages 1 1 Table 1 3 GGA Data Format 1 2 Table 1 4 Position Fix Indicator 1 2 Table 1 5 GLU Data Formal ERU ann RE ORCI RR RR uA 1 3 Table 1 6 GSA Data Format qakyay 1 3 Table 1 7 Model ee eri wb ned HU ILE Nb Ee 1 3 Table 1 8 Mod 2 Leber EISE PROS hu ka Dhuha es 1 3 Table 1 9 GSV Data Format xen bees Ee ER RR SA 1 4 Table 1 10 MSS Data Format 1 4 Table 1 11 RMC Data Format 1 5 Table 1 12 VIG Data Format g cedex eR er u Re Oaks RR 1 5 Table 2 1 Supported NMEA input messages
8. Fstarlle LP System Development Kit Product Briefs 1055 1031 GSP2e LP 1055 1030 GRF2i LP Application Notes APNT0003 Troubleshooting Guide APNT0004 System RF Front end R equirements for SiRFstar Architectures APNT0006 PCB Design Guidelines APNT0007 Open Short Detector APNT0010 GRF2i QFN Introduction APNTOO15 SiRFstarll S2AR Back up Power Operation APNT0017 Board Level Design for GSP 2e LP APNT0018 SiRFstarlle Low Power Operating Modes APNT0019 SSII CPU Clock and Hardware Detection APNT0020 Implementing User Tasks on the SiRFstarlle APNT0021 S2AM Hardware Reference Design Description APNT0023 Effect of Increasing User Task Duty Cycle on Performance APNT0028 Battery Backed SRAM Operation at 49MHz with the GSP 2e LP APNT0029 GSP2e and GSP2e LP Cache APNT0030 EHPE and EVPE Calculations APNT0032 Interfacing a 3 Wire Serial EEPROM with the GSP2e APNT0033 Standard 0183 Message Versions in SiRF Receivers APNT0035 Customer Design Review and Prototype Evaluation Process APNT0036 Interfacing to a GSM Modem via the USER1 Protocol SiRF Technology Inc SiRF France 148 East Brokaw San Jose CA 95 Tel 33 6 0717 7862 112 Fax 44 1344 668157 Tel 1 408 467 0410 Email rocky sirf com Fax 1 408 467 0420 Email gps sirf com Website http www sirf com SiRF Texas SiRF Germany Tel 1 972 239 6988 Tel 49 81 529932 90 Fax 1 972 239 0372 Fax 49 81 529931 70 Email jdanielsQ sirf com Email peterz sirf com SiRF United Kingdom SiRF T
9. Is Organized Chapter 1 Output Messages defines SiRF developed NMEA output messages Chapter 2 Input Messages defines SiRF developed NMEA input messages Related Manuals You can refer to the following for more information NMEA 0163 Standard For Interfacing Marine Electronic Devices Contacting SiRF Technical Support Address SiRF Technology Inc 148 East Brokaw Road San Jose CA 95112 U S A SiRF Technical Support Phone 1 408 467 0410 9 am to 5 pm Pacific Standard Time Email support sirf com General enquiries Phone I1 408 467 0410 9 am to 5 pm Pacific Standard Time Email gps sirf com xxii NMEA Reference Manual December 2002 lll Output Messages Table 1 1 lists each of the NMEA output messages specifically developed and defined by SiRF for use within SiRF products Table 1 1 NMEA Output Messages Option Description GGA Time position and fix type data GLL Latitude longitude UTC time of position fix and status GSA GPS receiver operating mode satellites used in the position solution and DOP values GSV The number of GPS satellites in view satellite ID numbers elevation azimuth and SNR values MSS Signal to noise ratio signal strength frequency and bit rate from a radio beacon receiver RMC Time date position course and speed data VTG Course and speed information relative to the ground A full description and definition of the listed NMEA
10. abled or disabled depending on the needs of the receiving program NMEA message settings are saved in battery backed memory for each entry when the message is accepted Table 2 7 contains the input values for the following examples 1 Query the GGA message with checksum enabled PSRF103 00 01 00 01 25 2 Enable VTG message for a 1 Hz constant output with checksum enabled PSRF103 05 00 01 01 20 3 Disable VTG message PSRF103 05 00 00 01 21 Table 2 7 Query Rate Control Data Format See example 1 Name Example Units Description Message ID PSRF103 PSRF103 protocol header Msg 00 See Table 2 8 Mode 01 O SetRate 1 Query Rate 00 seconds Output off 0 max 255 CksumEnable 01 0 Disable Checksum 1 Enable Checksum Checksum 25 lt CR gt lt LF gt End of message termination Table 2 8 Messages Value Description 0 GGA 1 GLL 2 GSA 3 GSV 4 RMC 5 VTG Input Messages 2 5 Note In TricklePower mode update rate is specified by the user When you switch to NMEA protocol message update rate is also required The resulting update rate is the product of the TricklePower Update rate and the NMEA update rate i e TricklePower update rate 2 seconds NMEA update rate 5 seconds resulting update rate is every 10 seconds 2 X 5 10 104 LLA Navigationlnitialization 2 6 This command is used to initialize the Evaluation Receiver by pro
11. aiwan Tel 44 1344 668390 Tel 886 2 2723 7853 Fax 44 1344 668157 Fax 886 2 2723 7854 Email aellis sirf com Email sirf_taiwan sirf com NMEA Reference Manual 2002 SiRF Technology Inc All rights reserved Products made sold or 5 883 595 5 897 605 6 282 231 6 292 749 Other United States and icensed by SiRF Technology Inc are protected by one or more of the following United States patents 5 488 378 5 504 482 5 552 794 5 592 382 5 638 077 5 901 171 5 917 383 5 920 283 6 018 704 6 037 900 6 041 280 6 044 105 6 047 017 6 081 228 6 114 992 6 125 325 6 198 765 6 236 937 6 249 542 6 278 403 6 297 771 6 301 545 6 304 216 6 351 486 6 351 711 6 366 250 6 389 291 6 393 046 6 400 753 6 421 609 6 427 120 6 427 121 6 453 238 and AU729 697 oreign patents are issued or pending SiRF SiRF plus Orbit design and SiRF Star are registered trademarks of SiRF Technology Inc SnapLock Foliage Lock TrickleP ower SingleSat SiRFLoc SiRFDRive and WinSiRF are trademarks of SiRF Technology Inc Other trademarks are property of respective companies This document contains information on SiRF products SiRF reserves the rightto make changes in its products specifications and other information at any time without notice SiRF assumes no liability or responsibility for any c aims or damages arising out of the use of this document or from the use of integrated circuits based on this data sheet including b
12. kOffset 96000 Hz Clock Offset of the Evaluation Receiver TimeOfWeek 497260 seconds GPS Time Of Week WeekNo 921 GPS Week Number ChannelCount 12 Range to 12 ResetCfg 3 See Table 2 4 and Table 2 5 Checksum 1C lt CR gt lt LF gt End of message termination 1 Use 0 for last saved value if available If this is unavailable a default value of 96 000 will be used 2 3 II No 102 SetDGPSPort 2 4 Table 2 4 Reset Configuration Non SiRFLoc Platforms Hex Description 0x01 Hot Start All data valid 0x02 Warm Start Ephemeris cleared 0x03 Warm Start with Init Ephemeris cleared initialization data loaded 0x04 Cold Start Clears all data in memory 0x08 Clear Memory Clears all data in memory and resets receiver back to factory defaults Table 2 5 Reset Configuration SiRFLoc Specific Hex Description 0x00 Perform a hot start using internal RAM data No initialization data will be used 0x01 Use initialization data and begin in start mode Unceretainties are 5 sec time accuracy and 300 km position accuracy Ephemeris data in SRAM is used 0x02 No initialization data is used ephemeris data is cleared and warm start performed using remaining data in RAM 0x03 Initialization data is used ephemeris data is cleared and warm start performed using remaining data in RAM 0x04 No initialization data is used Position time and ephemeris
13. lears all data in memory and resets receiver back to factory defaults NMEA Reference Manual December 2002 No II 105 Development Data On Off 106 Select Datum Input Messages Use this command to enable development data information if you are having trouble getting commands accepted Invalid commands generate debug information that enables the user to determine the source of the command rejection Common reasons for input command rejection are invalid checksum or parameter out of specified range Table 2 11 contains the input values for the following examples 1 Debug On PSRFI05 1 3E 2 Debug Off PSRF105 0 3F Table 2 11 Development Data On Off Data Format Name Example Units Description Message ID PSRF105 PSRF105 protocol header Debug 1 O Off 1 On Checksum 3E CR lt LF gt End of message termination GPS receivers perform initial position and velocity calculations using an earth centered earth fixed ECEF coordinate system Results may be converted to an earth model geoid defined by the selected datum The default datum is WGS 84 World Geodetic System 1984 which provides a worldwide common grid system that may be translated into local coordinate systems or map datums Local map datums are a best fit to the local shape of the earth and not valid worldwide Table 2 12 contains the input values for the following examples 1 Datum select TORYO MEAN PSRF106
14. m the Action menu see the Evaluation Kit User s Guide If the receiver is in SIRF Binary mode all NMEA input messages are ignored Once the receiver is put into NMEA mode the following messages may be used to command the module Transport Message Start Sequence Payload Checksum End Sequence PSRF lt MID gt Data CKSUM CR lt LF gt Message Identifier consisting of three numeric characters Input messages begin at MID 100 p Message specific data Refer to a specific message section for lt data gt lt data gt definition w CKSUM is a two hex character checksum as defined in the NMEA specification Use of checksums is required on all input messages Each message is terminated using Carriage Return CR Line Feed LF which is r n which is hex 0D Because r n are not printable ASCII characters they are omitted from the example strings but must be sent to terminate the message and cause the receiver to process that input message Note All fields in all proprietary NMEA messages are required none are optional All NMEA messages are comma delimited 2 1 2 NMEA Input Messages Message MID Description SetSerialPort 100 Set PORT A parameters and protocol NavigationInitialization 101 Parameters required for start using X Y Z SetDGPSPort 102 Set PORT B parameters for DGPS input Query Rate Control 103 Query standard NMEA mes
15. multiple messages of GSV data may be required MSS MSK Receiver Signal Table 1 10 contains the values for the following example GPMSS 55 27 318 0 100 66 Table 1 10 MSS Data Format Name Example Units Description Message ID GPMSS MSS protocol header Signal Strength 55 dB SS of tracked frequency Signal to Noise Ratio 27 dB SNR of tracked frequency Beacon Frequency 318 0 kHz Currently tracked frequency Beacon Bit Rate 100 bits per second Note The MSS NMEA message can only be polled or scheduled using the MSK NMEA input message See MSK MSK Receiver Interface on page 2 8 RMC Recommended Minimum Specific GNSS Data Table 1 11 contains the values for the following example GPRMC 161229 487 A 3723 2475 N 12158 3416 W 0 13 309 62 120598 10 1 4 NMEA Reference Manual December 2002 MM II Output Messages Table 1 11 RMC Data Format Name Example Units Description Message ID GPRMC RMC protocol header UTC Time 161229 487 hhmmss sss Status A A data valid or V data not valid Latitude 3723 2475 ddmm mmmm N S Indicator N N north or S south Longitude 12158 3416 dddmm mmmm E W Indicator w E east or W west Speed Over Ground 0 13 knots Course Over Ground 309 62 degrees True Date 120598 ddmmyy Magnetic Variation degrees E east or W west Checksum 10 lt CR gt lt LF gt End of message te
16. rmination 1 A valid status is derived from the SiRF Binary M I D 2 position mode 1 See the SiRF Binary Reference Manual 2 SiRF Technology Inc does not support magnetic declination All course over ground data are geodetic WGS84 directions VTG Course Over Ground and Ground Speed Table 1 12 contains the values for the following example GPVTG 309 62 T M 0 13 N 0 2 K 6E Table 1 12 VTG Data Format Name Example Units Description Message ID GPVTG VTG protocol header Course 309 62 degrees Measured heading Reference T True Course degrees Measured heading Reference M Magnetic Speed 0 13 knots Measured horizontal speed Units N Knots Speed 0 2 km hr Measured horizontal speed Units K Kilometers per hour Checksum 6E CR lt LF gt End of message termination 1 SiRF Technology Inc does not support magnetic declination All course over ground data are geodetic WGS84 directions 1 5 1 6 NMEA Reference Manual December 2002 Input Messages 2 NMEA input messages are provided to allow you to control the Evaluation Receiver while in NMEA protocol mode The Evaluation Receiver may be put into NMEA mode by sending the SiRF Binary protocol message Switch to NMEA Protocol Message I D 129 see the SiRF Binary Reference Manual This can be done using a user program or using the SiRFdemo software and selecting Switch to NMEA Protocol fro
17. sage and or set output rate LLANavigationlInitialization 104 Parameters required for start using Lat Lon Alt Development Data On Off 105 Development Data messages On Off Select Datum 106 Selection of datum to be used for coordinate transformations MSK Receiver Interface MSK Command message to a MSK radio beacon receiver 1 Message Identification MID 2 Input coordinates must be WGS84 3 Input coordinates must be WGS84 Note NMEA input messages 100 to 106 are SiRF proprietary NMEA messages The MSK NMEA string is as defined by the NMEA 0183 standard Table 2 1 provides a summary of supported 51 NMEA input messages by the specific SiRF platforms Table 2 1 Supported NMEA input messages SiRF Software Options Message ID GSW2 SiRFXTrac SiRFLoc 100 Yes Yes Yes 101 Yes Yes Yes 102 Yes No No 103 Yes Yes Yes 104 Yes Yes Yes 105 Yes Yes Yes 106 Yes Yes Yes MSK Yes No No 100 SetSerialPort This command message is used to set the protocol SiRF Binary or NMEA and or the communication parameters baud data bits stop bits parity Generally this command is used to switch the module back to SiRF Binary protocol mode where a more extensive command message set is available When a valid message is received the parameters are stored in battery backed SRAM and then the Evaluation Receiver restarts using the saved parameters Table 2 2 contains the input values for
18. the following example Switch to SiRF Binary protocol at 9600 8 N 1 PSRF100 0 9600 8 1 0 0C 2 2 NMEA Reference Manual December 2002 No II Input Messages Table 2 2 Set Serial Port Data Format Name Example Units Description Message ID PSRF100 PSRF100 protocol header Protocol 0 O SiRF Binary I NMEA Baud 9600 4800 9600 19200 38400 DataBits 8 8 7 StopBits 1 0 1 Parity 0 OzNone 1 Odd 2 Even Checksum 0C lt CR gt lt LF gt End of message termination 1 SiRF protocol is only valid for 8 data bits I stop bit and no parity 101 NavigationInitialization This command is used to initialize the Evaluation Receiver by providing current position in X Y Z coordinates clock offset and time This enables the Evaluation Receiver to search for the correct satellite signals at the correct signal parameters Correct initialization parameters enable the Evaluation Receiver to acquire signals quickly Table 2 3 contains the input values for the following example Start using known position and time PSRF101 2686700 4304200 385 1624 96000 497260 921 12 3 1C Table 2 3 Navigation Initialization Data Format Name Example Units Description Message ID PSRF101 PSRF101 protocol header ECEF X 2686700 meters X coordinate position ECEF Y 4304200 meters Y coordinate position ECEF Z 3851624 meters Z coordinate position Cl
19. uits based on this document including but not limited to claims or damages based on infringement of patents copyrights or other intellectual property rights SiRF makes no warranties either express or implied with respect to the information and specifications contained in this document Performance characteristics listed in this data sheet do not constitute a warranty or guarantee of product performance All terms and conditions of sale are governed by the SiRF Terms and Conditions of Sale a copy of which you may obtain from your authorized SiRF sales representative Getting Help If you have any problems contact your SiRF representative or call or send an e mail to the 51 Technology support group phone 1 408 467 0410 e mail support sirf com iii Contents Preface c qaa maa estu ee e ete oue ri Ged edu a sa XXI 1 Output Messages 1 1 GGA Global Positioning System Fixed Data 1 2 GLL Geographic Position Latitude Longitude 1 2 GSA GNSS DOP and Active Satellites 1 3 GSV GNSS Satellites in View 1 4 MSS MSK Receiver Signal 1 4 RMC Recommended Minimum Specific GNSS Data 1 4 VTG Course Over Ground and Ground Speed 1 5 2 Input Messages 2 1 Transport Message enop E de MoN SEL Rue taedas
20. ut not limited to claims or damages based on infringement of patents copyrights or other intellectual property rights No license either expressed or implied is granted to any intellectual property rights of SiRF SIRF makes no warranties either express or implied with respect to the information and specification contained in this document P erformance characteristics listed in this document do not constitute a warranty or guarantee of product performance SiRF products are not intended for use in life support systems or for life saving applications All terms and conditions of sale are governed by SiRF Terms and Conditions of Sale copy of which may obtain from your authorized SiRF sales representative December 2002
21. viding current position in latitude longitude and altitude coordinates clock offset and time This enables the receiver to search for the correct satellite signals at the correct signal parameters Correct initialization parameters enable the receiver to acquire signals quickly Table 2 9 contains the input values for the following example Start using known position and time PSRF104 37 3875111 121 97232 0 96000 237759 1946 12 1 07 Table 2 9 LLA Navigation Initialization Data Format Name Example Units Description Message ID PSRF104 PSRF104 protocol header Lat 37 3875111 degrees Latitude position Range 90 to 90 Lon 121 97232 degrees Longitude position Range 180 to 180 Alt 0 meters Altitude position ClkOffset 96000 Hz Clock Offset of the Evaluation Receiver TimeOfWeek 237759 seconds GPS Time Of Week WeekNo 1946 Extended GPS Week Number 1024 added ChannelCount 12 Range 1 to 12 ResetCfg 1 See Table 2 10 Checksum 07 lt CR gt lt LF gt End of message termination 1 Use for last saved value if available If this is unavailable a default value of 96 000 will be used Table 2 10 Reset Configuration Hex Description 0x01 Hot Start All data valid 0x02 Warm Start Ephemeris cleared 0x03 Warm Start with Init Ephemeris cleared initialization data loaded 0x04 Cold Start Clears all data in memory 0x08 Clear Memory C
22. x not available or invalid GPS SPS Mode fix valid Dir Differential GPS SPS Mode fix valid ww GPS PPS Mode fix valid GPS RTK Mode fix valid Note A valid position fix indicator is derived from the SiRF Binary M LD 2 position mode 1 See the SiRF Binary Reference Manual GLL Geographic Position Latitude Longitude Table 1 5 contains the values for the following example GPGLL 3723 2475 N 12158 3416 W 161229 487 A 2C 1 2 NMEA Reference Manual December 2002 GSA GNSS DOP and Active Satellites Output Messages Table 1 5 GLL Data Format Name Example Units Description Message ID GPGLL GLL protocol header Latitude 3723 2475 ddmm mmmm N S Indicator N N north or S south Longitude 12158 3416 dddmm mmmm E W Indicator w E east or W west UTC Position 161229 487 hhmmss sss Status A A data valid or V data not valid Checksum 2 lt CR gt lt LF gt End of message termination Table 1 6 contains the values for the following example GPGSA A 3 07 02 26 27 09 04 15 1 8 1 0 1 5 33 Table 1 6 GSA Data Format Name Example Units Description Message ID GPGSA GSA protocol header Mode 1 A See Table 1 7 Mode 2 3 See Table 1 8 Satellite Used 07 Sv on Channel 1 Satellite Used 02 Sv on Channel 2 Satellite Used Sv on Channel
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