SiRFstarIIeLP Evaluation Kit User's Guide
Contents
1. 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 7122 CR lt LF gt End of message termination 2 7 P MSK MSK Receiver Interface Table 2 15 contains the values for the following example GPMSK 318 0 A 100 M 2 45 Table 2 15 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 M 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 use the SiRF binary protocol and then switch to NMEA 2 8 NMEA Reference Manual December 2004 ADDITIONAL AVAILABLE PRODUCT INFORMATION Part Number Description 1050 0042 NMEA Reference Manual 1050 0041 SIRF Binary Protocol Reference Manual 1065 0136 Product Inserts 1050 0056 SiRFstarlll System Development Kit User Guide 1050 0053 GSW3 Sof2. SiRF 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 January 2005 Revision 1 3 SiRF SiRFstar and SiRF plus orbit design are registered in the U S Patent and Trademark Office 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 ii NMEA Reference Manual Copyright 1996 2005 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 circuits based on
3. using the saved parameters NMEA Reference Manual December 2004 Input Messages Table 2 4 contains the input values for the following example Switch to SiRF binary protocol at 9600 8 N 1 PSRF100 0 9600 8 1 0 0C Table 2 4 Set Serial Port Data Format Name Example Units Description Message ID PSRF100 PSRF100 protocol header Protocol 0 O SiRF binary Baud 9600 4800 9600 19200 38400 DataBits 8 StopBits l 0 1 Parity 0 0 None 1 Odd 2 Even Checksum 0C CR lt LF gt End of message termination 1 SiRF protocol is only valid for 8 data bits 5 bit and no parity 101 Navigationlnitialization 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 5 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 5 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 385162
4. 0 00 eee 2 7 RMC Data FOMA 44 5 233 8 9 ena sed whet a tn 2 8 NMEA Reference Manual January 2005 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 NMEA 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 Guide Is Organized Related Manuals This manual contains the following chapters Chapter 1 Output Messages defines SiRF developed NMEA output messages Chapter 2 Input Messages defines SiRF developed NMEA input messages You can refer to the following document for more information 95 NMEA 0183 Standard For Interfacing Marine Electronic Devices e SiRF Binary Protocol Reference Manual e SiRF Evaluation Kit User Guide e SiRF System Development Kit User Guide 1X 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 gsirf com General enquiries Phone 1 408 467 0410 9 am to 5 pm Pacific Standard Time Email gps gsirf com X NM
5. Ii GSV GNSS Satellites in View Table 1 9 contains the values for the following example GPGSV 2 1 07 07 79 048 42 02 51 062 43 26 36 256 42 27 277 138 42 71 GPGSV 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 to 3 Message Number l Range to 3 Satellites in View 07 Satellite ID 07 Channel 1 Range to 32 Elevation 79 degrees Channel 1 Maximum 90 Azimuth 048 degrees Channel True Range 0 to 359 SNR C No 42 dBHz Range 0 to 99 null when not tracking satellite ID 21 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 7 CR lt LF gt End of message termination 1 Depending on the number of satellites tracked multiple messages of GSV data may be required MSS MSK Receiver Signal Output Messages Note Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description Table 1 10 contains the values for the following example GPMSS 55 27 318 0 100 1 57 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
6. SIF H contains the NMEA version defines GGA Global Positioning System Fixed Data Note Fields marked in italic red apply only to NMEA version 2 3 and later in this 1 2 NMEA message description 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 Message ID GPGGA GGA protocol header N S Indicator N N north or S south EN Indicator W Position Fix Indicator 1 See Table 1 4 MSL Altitude 9 0 meters Units M meters Age of Diff Corr second Null fields when DGPS is not used Checksum 18 CR lt LF gt End of message termination NMEA Reference Manual January 2005 Ii Table 1 4 Position Fix Indicator 0 Fix not available or invalid l GPS SPS Mode fix valid 2 Differential GPS SPS Mode fix valid 3 5 Not supported 6 Dead Reckoning Mode fix valid Note A valid position fix indicator 15 derived from the SiRF Binary M I D 2 position mode 1 See the SiRF Binary Protocol Reference Manual GLL Geographic Position Latitude Longitude Note Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description Table 1 5 contains the values for the following example GPGLL 3723 2475 N 12158 3416 W 161229 487 A A 41 Table 1 5 GLL Data Format Name Example Units Descri
7. each entry when the message is accepted Input Messages Table 2 9 contains the input values for the following examples 1 Query the GGA message with checksum enabled PSRF103 00 01 00 01 25 PSRF103 05 00 01 01 20 Disable VTG message PSRF103 05 00 00 01 21 Enable VTG message for a 1 Hz constant output with checksum enabled Table 2 9 Query Rate Control Data Format See example 1 Name Example Units Description Message ID PSRF103 PSRF103 protocol header Msg 00 See Table 2 10 Mode 01 0 SetRate 1 Query Rate 00 seconds Output off 0 max 255 CksumEnable 01 0 Disable Checksum 1 Enable Checksum Checksum 725 CR lt LF gt End of message termination Table 2 10 Messages Value Description 0 GGA l GLL 2 GSA 3 GSV 4 RMC 5 VTG 6 MSS If internal beacon is supported 7 Not defined 8 ZDA if 1PPS output is supported 9 Not defined Note In TricklePower mode update rate is specified by the user When switching to NMEA protocol the 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 P 104 LLA Navigationlnitialization This command is used to initialize the Evaluation Receiver by providing current position in latitude l
8. ephemeris 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 that 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 the receiver restarts using the saved parameters Table 2 8 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 8 Set DGPS Port Data Format Name Example Units Description Message ID PSRF102 PSRF102 protocol header Baud 9600 4800 9600 19200 38400 DataBits 8 8 7 StopBits 0 1 Parity 0 0 None 1 Odd 2 Even Checksum 12 lt CR gt lt LF gt End of message termination NMEA Reference Manual December 2004 103 Query Rate Control This command 15 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 enabled or disabled depending on the needs of the receiving program NMEA message settings are saved in battery backed memory for
9. 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 SiRF Technology support group phone 1 408 467 0410 e mail support sirf com NMEA Reference Manual January 2005 Contents Prelaee iu i d eS DER A AUR ix 1 Output MesSd96eS cd os Sen woe eee ea 1 1 GGA Global Positioning System Fixed Data 1 2 GLL Geographic Position Latitude Longitude 1 3 GSA GNSS DOP and Active Satellites 04 1 4 GSV GNSS 51 1 5 MSS MSK Receiver 8 1 5 RMC Recommended Minimum Specific GNSS Data 1 6 VTG Course Over Ground and Ground Speed 1 7 ZDA SIiRF 6568 6 1 7 50 OR TO
10. 4 meters Z coordinate position ClkOffset 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 6 and Table 2 7 Checksum TC CR 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 is used 2 3 Ii No 102 SetDGPSPort 2 4 Table 2 6 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 the receiver back to factory defaults Table 2 7 Reset Configuration SiRFLoc Specific Hex Description 0x00 Perform a hot start using internal RAM data No initialization data is used 0x01 Use initialization data and begin in start mode Uncertainties are 5 seconds 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
11. DA protocol header UTC time 181813 Either using valid IONO UTC or estimated from default leap seconds Day 14 01 TO 31 Month 10 01 TO 12 Year 2003 1980 to 2079 Local zone hour 00 knots Offset from UTC set to 00 Local zone minutes 00 Offset from UTC set to 00 Checksum CR lt LF gt End of message termination 1 7 Ii 150 OkToSend 1 6 This message is being sent out during the trickle power mode to communicate with an outside program such as SiRFDemo to indicate whether the receiver is awake or not Table 1 14 contains the values for the following examples 1 OkToSend PSRF150 1 3F 2 not OkToSend PSRF150 0 3E Table 1 14 OkToSend Message Data Format Name Example Units Description Message ID PSRF150 PSRF150 protocol header OkToSend l 1 OK to send 0 not OK to send Checksum 3F CR lt LF gt End of message termination NMEA Reference Manual January 2005 lransport Message Input Messages d NMEA input messages enable 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 Protocol Reference Manual This can be done by using a user program or by using the SiRFSDemo software and selecting Switch to NMEA Protocol from the Action menu see the SiRF Evaluation Kit User Guide or the SiRFDemo U
12. EA Reference Manual January 2005 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 GGA GLL GSA GSV MSS RMC VTG ZDA 150 Description Time position and fix type data Latitude longitude UTC time of position fix and status GPS receiver operating mode satellites used in the position solution and DOP values The number of GPS satellites in view satellite ID numbers elevation azimuth and SNR values Signal to noise ratio signal strength frequency and bit rate from a radio beacon receiver Time date position course and speed data Course and speed information relative to the ground PPS timing message synchronized to PPS OK to send message A full description of the listed NMEA messages are provided in the following sections 1 1 Ii Table 1 2 provides a summary of SIRF NMEA output messages supported by the specific SiRF platforms Table 1 2 Supported NMEA Output Messages SiRF Software Options Message GSW2 GSW3 GGA Yes Yes Yes Yes GSV Yes Yes Yes Yes VTG Yes Yes Yes Yes ZDA 2 3 2 and above No 150 2 3 2 and above No Note GSW2 software only outputs NMEA version 2 20 and earlier XTrac and GSW3 software have conditional defines UI NMEA VERSION XXX to allow a choice between NMEA 2 20 and 3 00 The file NMEA
13. SEN 4s cac iot e a o SIR aa Be dea 1 8 2 Input Messi t s o ciii ou inthe decer a eas eu Lew Ha Ca 2 1 Transport MeSSdDe sutor 3 0 9 Spero do RN A Re E eda S 2 NMEA Input Messages uz cx dea e ae ace e HEURE RUE 2 2 100 SetSerialPort YS 2 2 iii 101 NavigationInitialization llle 2 3 102 5 2 4 103 Query Rate 2 5 104 1 1 14 1 4 0 2 6 05 4 2 6 l06 Select Datutti 2 24 026s ese bed dm CERO yag ead eC 2 7 MSK MSK Receiver Interface ccc eee 2 8 NMEA Reference Manual January 2005 Figures vi NMEA Reference Manual January 2005 Tables Table 1 1 NMEA Output Messages 0 00000 ccc ees 1 1 Table 1 2 Supported NMEA Output Messages 0 000000 0 1 2 Table 1 3 GGA Data Formae cus aces hee data due rq date dna d are qns 1 2 Table 1 4 Position Fix Indicatot uo iuc hw Shank eat citet d ied 1 3 Table 1 5 OE JU lt OFM At alicui tea acea ot den ee O a Crete epee 1 3 Table 1 6 GSA Data FORMA sso LC o de cr ES Dea 1 4 Table 1 7 a eae ERT Ce re a aur d ad 1 4 Table 1 8 Mode 2 ks teda 1 4 Table 1 9 G
14. SV Data BOETJU c shun ati wap koe qas 1 5 Table 1 10 MSS Data Potato e rd ie A eie iR a ar hoe aren o 1 5 Table 1 11 RMC Data Formal s can api iex p DE deer EAD Sas 1 6 Table 1 12 Aut Gr Data Borat ouo e eed s cds 1 7 Table 1 13 ZDA Data Format zoe o aed US au x ada adu bts 1 7 Table 1 14 OkToSend Message Data 1 8 Table 2 1 Transport Message 2 1 Table 2 2 NMEA Input Messages 0 0 0 2 2 Vil vill Table 2 3 Table 2 4 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 Table 2 14 Table 2 15 Supported NMEA Input Messages 0000 0c eae 2 2 Set Serial Port Data 2 3 Navigation Initialization Data 2 3 Reset Configuration Non SiRFLoc Platforms 2 4 Reset Configuration SiRFLoc 5 2 4 set DGPS Port Data eee eee 2 4 Query Rate Control Data Format See example 1 2 5 MESSAGES nara mass aO Set oa PG SHE UE epe EE S 2 5 LLA Navigation Initialization Data Format 2 6 Reset Configuration 0 0 00 ccc eee 2 6 Development Data On Off Data Format 2 7 Select Datum Data Format 0 0 0
15. c does not support magnetic declination All course over ground data are geodetic WGS84 directions NMEA Reference Manual January 2005 VTG Course Over Ground and Ground Speed Note Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description Table 1 12 contains the values for the following example GPVTG 309 62 T M 0 13 N 0 2 K A 23 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 Mode A A Autonomous D DGPS E DR Checksum 723 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 ZDA SikF Timing Message Output Messages Outputs the time associated with the current 1 PPS pulse Each message is output within a few hundred ms after the 1 PPS pulse is output and tells the time of the pulse that just occurred Table 1 13 contains the values for the following example GPZDA 181813 14 10 2003 00 00 4F Table 1 13 ZDA Data Format Name Example Units Description Message ID GPZDA Z
16. defaults 105 Development Data On Off 2 6 Use this command to enable development data information if you are having trouble getting commands accepted Invalid commands generate debug information that enables the you to determine the source of the command rejection Common reasons for input command rejection are invalid checksum or parameter out of specified range NMEA Reference Manual December 2004 Table 2 13 contains the input values for the following examples 1 Debug On PSRF105 1 3E 2 Debug Off PSRF105 0 3F Table 2 13 Development Data On Off Data Format Name Example Units Description Message ID PSRF105 PSRF105 protocol header Debug 1 0 Off 1 On Checksum 3E CR lt LF gt End of message termination 106 Select Datum 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 14 contains the input values for the following examples 1 Datum select TOKYO MEAN PSRF106 178 32 Table 2 14 Select Datum Data Format Input Messages
17. l SalesFrance sirf com SIRF Germany Tel 49 81 529932 90 Fax 49 81 529931 70 Email SalesGermany sirf com SIRF Taiwan Tel 886 2 2723 7853 Fax 886 2 2723 7854 Email SalesAsiaPacific sirf com SIRF India Tel 91 120 251 0256 Fax 91 120 251 0584 Email Salesindia sirf com 2005 SiRF Technology Inc All rights reserved Products made sold or licensed 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 5 883 595 5 897 605 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 6 282 231 6 292 749 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 Other United States and foreign patents are issued or pending SIRF SiRFStar SIRF plus Orbit design are registered in the U S Patent and Trademark office SnapLock SnapStart SingleSat Foliage Lock TricklePower Push to Fix WinSiRF SIRFLoc SiRFDRive SIRFNav SIRFXTrac SiRFSoft SoftGPS UrbanGPS and Multimode Location Engine are trademarks of SiRF Technology Inc Other trademarks are property of their respective companies This document contains information on SiRF products SIRF reserves the right to make changes in its products specifications and other inf
18. ongitude 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 11 contains the input values for the following example Start using known position and time PSRFE104 37 3875111 121 97232 0 96000 237759 1946 12 1 07 Table 2 11 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 CIkOffset 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 l See Table 2 12 Checksum 07 CR 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 is used Table 2 12 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 Clears all data in memory and resets receiver back to factory
19. ormation 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 circuits based on this data sheet including but 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 Performance 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 the SIRF Terms and Conditions of Sale a copy of which may obtain from your authorized SiRF sales representative December 2004 OY Please US Recycle
20. ption 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 Time 161229 487 hhmmss sss Status A A data valid or V data not valid Mode A A Autonomous D DGPS E DR Only present in NMEA version 3 00 Checksum 4 CR lt LF gt End of message termination Output Messages 1 3 GSA GNSS DOP and Active Satellites 1 4 Note Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description 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 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 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 End of message termination 1 Satellite used in solution Table 1 7 Mode 1 M Manual forced to operate in 2D or 3D mode A 2D Automatic allowed to automatically switch 2D 3D Value Description l Fix not available 2 2D lt 4 SVs used 3 3D 353 SVs used NMEA Reference Manual January 2005
21. ser 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 Table 2 1 describes the transport message parameters Table 2 1 Transport Message parameters Start Sequence a Checksum End Sequence PSRF lt MID gt CK SUM lt CR gt lt LF gt 1 Message Identifier consisting of three numeric characters Input messages begin at MID 100 2 Message specific data Refer to a specific message section for lt data gt lt data gt definition 3 CKSUM isa two hex character checksum as defined in the NMEA specification VMEA 0183 Standard For Interfacing Marine Electronic Devices Use of checksums is required on all input messages 4 Each message is terminated using Carriage Return CR Line Feed LF which is r n which is hex 0D 0A Because Wn 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 P NMEA Input Messages 100 SetSerialPort 2 2 Table 2 2 describes the NMEA input messages Table 2 2 NMEA Input Messages Message MID Description SetSerialPort 100 Set PORT A parameters and protocol Naviga
22. tionInitialization 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 message and or set output rate LLANavigationInitialization 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 3 provides a summary of supported SiRF NMEA input messages by the specific SiRF platforms Table 2 3 Supported NMEA Input Messages SIRF Software Options Message ID GSW2 SIRFX Trac SIRFLoc 100 Yes Yes Yes 102 Yes No No 103 Yes Yes Yes 105 Yes Yes Yes 106 Yes Yes Yes MSK Yes No No This command message is used to set the protocol SiRF binary or NMEA and or the communication parameters Baud data bits stop bits and 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 the Evaluation Receiver restarts
23. tracked frequency Beacon Frequency 318 0 kHz Currently tracked frequency Beacon Bit Rate 100 bits per second Channel Number 1 The channel of the beacon being used if a multi channel beacon receiver is used Checksum us i CR lt LF gt End of message termination 1 5 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 1 6 Note Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description Table 1 11 contains the values for the following example GPRMC 161229 487 A4 3723 2475 N 12158 3416 W 0 13 309 62 120598 10 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 13 knots Course Over Ground 309 62 degrees True Date 120598 ddmmyy Magnetic Variation degrees E east or W west Mode A A Autonomous D DGPS E DR Checksum 10 lt CR gt lt LF gt End of message termination 1 A valid status is derived from the SiRF Binary M I D 2 position mode 1 See the SiRF Binary Protocol Reference Manual 2 SiRF Technology In
24. tware System Development Kit Reference Manual 1050 0054 S3SDK Board System Development Kit Reference Manual 1050 0055 GSP3 Chip System Development Kit Reference Manual 1055 1034 GSP3f Data Sheet 1055 1035 GRF3w Data Sheet Available on the Developer Web Site APNT3001 SSIII System Guidelines and Considerations APNT3002 PCB Design Guidelines for SSIII Implementations APNT3003 Back Up Power Operation for SSIII Architectures APNT3004 Troubleshooting Notes for SSIII Board Development APNT3005 Co Location and Jamming Considerations for SSIII Integration APNT3006 GPIO Pin Functionality for SSIII APNT3007 I O Message Definitions for SSIII APNT3008 Implementing User Tasks in the SSIII Architecture APNT3009 Effects of User Tasks on GPS Performance for SSIII APNT3010 Advanced Power Management APM Considerations for SSIII APNT3011 Multi ICE Testing Issues for SSIII APNT3012 Production Testing of SSIII Modules APNT3014 Automotive Design Considerations for SSIII SiRF Technology Inc SiRF France 148 East Brokaw san Jose CA 95112 Tel 1 408 467 0410 Fax 1 408 467 0420 Email gos sirf com Website http www sirf com SiRF Texas Tel 1 972 239 6988 Fax 1 972 239 0372 Email SalesAmericas sirf com SiRF United Kingdom Tel 44 1344 668390 Fax 44 1344 668157 Email SalesUK sirf com SIRF Japan Tel 81 44829 2186 Fax 81 44829 2187 Email SalesJapan sirf com NMEA Reference Manual Tel 33 6 0717 7862 Fax 44 1344 668157 Emai
Download Pdf Manuals
Related Search