GLOBALSAT GPS Engine Board
Contents
1. GPS Active Antenna Specifications Recommendation Frequency 1575 42 2MHz Amplifier Gain 18 22dB Typical Axial Ratio 3 dB Typical Output VSWR 2 0 Max Output Impedance 500 Noise Figure 2 0 dB Max Polarization RHCP Antenna Input Voltage 2 85V Typ 2010 7 15 7 ET 318 High Performance GPS Engine Board VA GlobalSat Wired by Wireless OPERATING Description VCC This is the main power supply to the engine board 3 1Vdc to 3 5Vdc GND This is Ground pin for the baseband circuit RxDO This is the main channel for receiving software commands from SiRFdemo software or from your proprietary software TxDO This is the main transmits channel for outputting navigation and measurement data to user s navigation software or user written software Output is TTL level OV 2 85V RxD1 For user s application default null TxD1 For user s application default null RF IN This pin receives signal of GPS analog via external active antenna It has to be a controlled impedance trace at 50ohm Do not have RF traces closed the other signal path and routing it on the top layer Keep the RF traces as short as possible 2010 7 15 VBAT This is the battery backup power input for the SRAM and RTC when main power is off Without the external backup battery ET 318 will always execute a cold star after turning on To achieve the faster start up offered by a hot or warm2. M GLOBALSAT GPS Engine Board GlobalSat Wired by Wireless Hardware Data Sheet Product No ET 318 Version 2 2 Globalsat Technology Corporation 16F No 186 Jian Yi Road Chung Ho City Taipei Hsien 235 Taiwan Tel 886 2 8226 3799 Fax 886 2 8226 3899 E mail service globalsat com tw Website www globalsat com tw Issue Date 2010 07 15 APPR Ray CHECK Luwalk PREPARE Jeff 2010 7 15 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless Product Description Product Description ET 318 is a compact high performance and low power consumption GPS engine board It uses SiRF Star Ill chipset which can track up to 20 satellites at a time and perform fast TTFF in weak signal environments ET 318 is suitable for the following applications Automotive navigation Personal positioning Fleet management Mobile phone navigation Marine navigation Product Features SIRF star IIl high performance GPS Chipset Very high sensitivity Tracking Sensitivity 159 dBm Extremely fast TTFF Time To First Fix at low signal level Two serial ports 4Mb flash Built in LNA Compact size 15 2mm 14 mm 2 4mm suitable for space sensitive application One size component easy to mount on another PCB board Support NMEA 0183 V2 3 Output GGA GSA GSV RMC VTG GLL ZDA Support SiRF binary protocol 2010 7 15 2 ET 318 pp GlobalSat High P
3. Name Example Units Description Message ID GPGSV GSV protocol header Number of 2 Range 1 to 3 Messages 1 Message Number1 1 Range 1 to 3 Satellites in View1 07 Satellite ID 07 Channel 1 Range 1 to 32 Elevation 79 degrees Channel 1 Maximum90 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 AT Channel 4 Range 1 to 32 Elevation 27 Degrees Channel 4 Maximum90 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 lt CR gt lt LF gt End of message termination Depending on the number of satellites tracked multiple messages of GSV data may be required In some software versions the maximum number of satellites reported as visible is limited to 12 even though more may be visible 2010 7 15 12 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless RMC Recommended Minimum Specific GNSS Data Note Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description Table B 10 contains the values for the following example GPRMC 161229 487 A 3723 2475 N 12158 3416 W 0 13 309 62 120598 10 Table B 10 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
4. use this 2010 7 15 16 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless command to allow the receiver to correctly decode the data When a valid message is received the parameters will be stored in battery backed SRAM and then the receiver will restart using the saved parameters Format PSRF102 lt Baud gt lt DataBits gt lt StopBits gt lt Parity gt CKSUM lt CR gt lt LF gt lt baud gt 1200 2400 4800 9600 19200 38400 lt DataBits gt 8 lt StopBits gt 0 1 lt Parity gt O None Odd 1 Even 2 Example Set DGPS Port to be 9600 8 N 1 PSRF102 9600 8 1 0 12 D Query Rate Control ID 103 Query standard NMEA message and or set output rate This command is used to control the output of standard NMEA message GGA GLL GSA GSV RMC VTG Using this command message standard NMEA message 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 each entry when the message is accepted Format PSRF103 lt msg gt lt mode gt lt rate gt lt cksumEnable gt CKSUM lt CR gt lt LF gt msg 0 GGA 1 GLL 2 GSA 3 GSV 4 RMC 5 VTG lt mode gt 0 SetRate 1 Query lt rate gt Output every lt rate gt seconds off 0 max 255 lt cksumEnable gt O disable Checksum 1 Enable checksum for specified messa
5. 3010s Time sec Pre heating temperature 150 10 C Pre heating time 90 30 sec Heating temperature 235x5 C Heating time 10 1 sec Peak temperature must not exceed 240 C and the duration of over 200 C should be 30 10 Seconds 2010 7 15 21
6. 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 lt CR gt lt LF gt End of message termination SiRF Technology Inc does not support geoid corrections Values are WGS84 ellipsoid heights Table B 3 Position Fix Indicator Value Description 0 Fix not available or invalid 1 GPS SPS Mode fix valid 2 Differential GPS SPS Mode fix valid 3 Not supported 6 Dead Reckoning Mode fix valid 2010 7 15 10 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless 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 B 4 contains the values for the following example GPGLL 3723 2475 N 12158 3416 W 161229 487 A A 41 Table B 4 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 Mode A A Autonomous D DGPS E DR N Output Data Not Valid Checksum 41 lt CR gt lt
7. gt 0 1 lt Parity gt OzNone 1 Odd 2 Even Example 1 Switch to SIRF Binary protocol at 9600 8 N 1 PSRF100 0 9600 8 1 0 0C lt CR gt lt LF gt Example 2 Switch to User1 protocol at 38400 8 N 1 PSRF100 4 38400 8 1 0 38 lt CR gt lt LF gt Checksum Field The absolute value calculated by exclusive OR the 8 data bits of each character in the Sentence between but excluding and The hexadecimal value of the most significant and least significant 4 bits of the result are convertted to two ASCII characters 0 9 A F for transmission The most significant character is transmitted first lt CR gt lt LF gt Hex OD 0A B Navigation Initialization ID 101 Parameters required for start This command is used to initialize the module for a warm start by providing current position in X Y Z coordinates clock offset and time This enables the receiver to search for the correct satellite signals at the correct signal parameters Correct initialization parameters will enable the receiver to acquire signals more quickly and thus produce a faster navigational solution When a valid Navigation Initialization command is received the receiver will restart using the input parameters as a basis for satellite selection and acquisition 2010 7 15 15 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless Format PSRF101 lt X gt lt Y gt lt Z gt lt ClkOffset gt l
8. 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 East West Indicator E E east Mode A A Autonomous D DGPS E DR N Output Data Not Valid Checksum 10 lt CR gt lt LF gt End of message termination 1 A valid status is derived from all the parameters set in the software This includes the minimum number of satellites required any DOP mask setting presence of DGPS corrections etc If the default or current software setting requires that a factor is met then if that factor is not met the solution will be marked as invalid 2 SiRF Technology Inc does not support magnetic declination All course over ground data are geodetic WGS84 directions relative to true North 2010 7 15 13 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless 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 B 12 contains the values for the following example GPVTG 309 62 T M 0 13 N 0 2 K A 23 Table B 10 RMC Data Format Name Example Units Description Message ID GPVTG VTG protocol header Course 309 62 degrees Measured headi
9. start a battery backup must be connected The battery voltage should be between 2 0V and 3 5V RESET N This pin is input low active This Module has internal Power on Reset circuit BOOTSEL Set this pin to high for programming flash in debug mode If need programming ET 318 Flash just pull up 15KQ resistor to 3 3V When ET 318 used in normal function this pin just NC TIMEPLUSE This pin provides one pulse per second output from the board which is synchronized to GPS time This is not available in Trickle Power mode If do not use it Just NC GPIOs User can use this I O pin for special functions For example control LED ET 318 had GPIO 1 amp 13 amp 14 amp 15 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless SOFTWARE COMMAND NMEA Output Command GGA Global Positioning System Fixed Data Note Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description Table B 2 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 B 2 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 B 3
10. LF gt End of message termination GSA GNSS DOP and Active Satellites Table B 5 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 B 5 GSA Data Format Name Example Units Description Message ID GPGSA GSA protocol header Mode 1 A See Table B 6 Mode 2 3 See Table B 7 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 15 Vertical dilution of Precision Checksum 33 lt CR gt lt LF gt End of message termination Satellite used in solution 2010 7 15 Il ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless Maximum DOP value reported is 50 When 50 is reported the actual DOP may be much larger Table B 6 Mode1 Value Description M Manual forced to operate in 2D or 3D mode A 2Dautomatic allowed to automatically switch 2D 3D Table B 7 Mode 2 Value Description 1 Fix Not Available 2 2D 3 3D GSV GNSS Satellites in View Table B 8 contains the values for the following 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 Table B 8 GSV Data Format
11. erformance GPS Engine Board Wired by Wireless Product Block Diagram GPS Signal SAW FILTE RF Band GPS DATA Base Band ET 318 RTC PWR GPIO 14 Product Pin Description 19 17 16 15 14 13 12 fi 10 2010 7 15 3 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless PIN Number s Name Type Description Note 1 3 9 18 19 GND P Ground 2 RF IN RF GPS antenna input 4 RESET_N System reset active low 5 VCC P Main power supply to the engine board 6 V BAT P Backup battery supply voltage 7 RxD1 Serial input default null 1 8 TxD1 O Serial output default null 10 BOOTSEL Set this pin to high for programming flash 2 This is the main transmits channel for 44 TxD0 o outputting navigation and measurement data to user s navigation software or user written software Output TTL level OV 2 85V This is the main receive channel for receiving software commands to the engine board from 12 RxDO 1 SiRFdemo software or from user written software 13 GPIO1 I O General purpose I O 2 3 14 GPIO14 I O General purpose I O 1 3 15 TIMEPULSE O One pulse per second output 1PPS 2 3 16 GPIO13 I O General purpose I O 1 3 17 GPIO15 I O General purpose I O 1 3 lt Note gt 1 Internal pull up resistor 100KQ nominal 2 Internal pull down resistor 100KQ nominal 3 Default in
12. ge Example 1 Query the GGA message with checksum enabled PSRF103 00 01 00 01 25 Example 2 Enable VTG message for a 1Hz constant output with checksum enabled PSRF103 05 00 01 01 20 Example 3 Disable VTG message PSRF103 05 00 00 01 21 E LLA Navigation Initialization ID 104 Parameters required to start using Lat Lon Alt This command is used to initialize the module for a warm start by providing current position in Latitude Longitude Altitude coordinates clock offset and time This enables the receiver to 2010 7 15 17 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless search for the correct satellite signals at the correct signal parameters Correct initialization parameters will enable the receiver to acquire signals more quickly and thus will produce a faster navigational soution When a valid LLA Navigation Initialization command is received the receiver will restart using the input parameters as a basis for satellite selection and acquisition Format PSRF104 lt Lat gt lt Lon gt lt Alt gt lt ClkOffset gt lt TimeOfWeek gt lt WeekNo gt lt ChannelCount gt lt ResetCfg gt CKSUM lt CR gt lt LF gt lt Lat gt Latitude position assumed positive north of equator and negative south of equator float possibly signed lt Lon gt Longitude position it is assumed positive east of Greenwich and negative west of Greenwich Float possibly signed lt Alt g
13. ng 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 N Output Data Not Valid Checksum 23 lt CR gt lt LF gt End of message termination SiRF Technology Inc does not support magnetic declination All course over ground data are geodetic WGS84 directions 2010 7 15 14 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless NMEA Input Command A Set Serial Port ID 100 Set PORTA parameters and protocol This command message is used to set the protocol SiRF Binary NMEA or USER1 and or the communication parameters baud data bits stop bits parity Generally this command would be used to switch the module back to SiRF Binary protocol mode where a more extensive command message set is available For example to change navigation parameters When a valid message is received the parameters will be stored in battery backed SRAM and then the receiver will restart using the saved parameters Format PSRF100 lt protocol gt lt baud gt lt DataBits gt lt StopBits gt lt Parity gt CKSUM lt CR gt lt LF gt protocol OZSiRF Binary 1 NMEA 4 USER1 lt baud gt 1200 2400 4800 9600 19200 38400 lt DataBits gt 8 7 Note that SIRF protocol is only valid f8 Data bits lt StopBits
14. osition Accuracy SBAS P 4 Speed lt 0 01 m s Velocity Accuracy Heading lt 0 01 degrees Reacquisition 0 1 second average Max Update Rate 5 Hz Maximum Altitude 18 000 meter Maximum Velocity 515 meter second Maximum Acceleration 4G Note 1 142 dBm 28dB Hz with 4 dB noise figure 2 5096 130dBm Fu 0 5ppm Tu 22s Pu 30Km 3 50 24hr static 130dBm 4 5096 30m s Package Dimensions C Q Wo ZIRIS NO OONINDO S cou Otero LL TTT 14 00 LUI beac OONNODOOOM OMOONMO tr TNO FONDO TN 2010 7 15 6 Er VA GlobalSat High Performance GPS Engine Board J senu by Wireless Application Application Circuit 50 Ohm Micro strip line 41 I PEX connect External antenna M1 ET 318 GPIO15 1 eno GPIo15 HS GPIO13 LI 2 RFN GPIo13 HESL l TIMEMARK 3 GND TIMEMARK H Reser 4 NRESET oprog 14 98014 5 13 GPIO1 rp puru pro L4 BLM18AG121SN1D 6 12 RXA 2 1 GPS 3V3 VBAT RXA ir TXA F a H exp ma ek 2 1 Cro 4 4 4 Bootsel RBS21S H TXB BoorsEL iU Beetsel L3 BLM18AG121SN1D exl e C10 oe R6 amp D2 Es 9 Ti e ea Ur oUF RBS125 9 3 270R Ow al p o v BATTERY MS518S FL35E e POWER Circuit GPS POWER VIN GPS 3V3 O O VIN VOUT GND BLM18AG121SN1D Mis C3 XC6209B332MRN 3 3V 10UF 16V 470PF 22UF 10V
15. put at reset 2010 7 15 4 ET 318 High Performance GPS Engine Board VA GlobalSat Wired by Wireless Electrical Specification Absolute Maximums Ratings Parameter Min Typ Max Conditions Unit Main power supply 3 1 3 3 3 5 V Backup battery supply 2 0 3 5 V Main power supply Current 23 25 27 mA Backup battery supply Current 4 5 5 5 5 uA High Level input Voltage 0 7 VDD 2 5 V Low Level input Voltage 0 3 0 3 VDD V High Level input Current 40 10 V 2 85V A u 60 with Pull Low Low Level input Current 40 10 V 0V jA 60 with Pull High High Level output Voltage 0 75 VDD V Low Level output Voltage 0 25 VDD V Input Impedance 50 Q Operating Frequency 1 575 Ghz yx VDD is 2 85V for SIRF STARIII CHIP Environmental Characteristics Parameter Min Typ Max Unit Humidity Range b 95 non condensing Operation Temperature 40 25 85 Storage Temperature 40 85 s Physical Characteristic Type 19 pin stamp holes Dimensions 15 2mm 14 mm 2 4mm 2010 7 15 ET 318 High Performance GPS Engine Board VA GlobalSat Wired by Wireless Receiver Performance 1 Tracking 159dBm SEHE Autonomous acquisition 142 dBm Cold Start Autonomous 35s Time To First Fix Warm Start Autonomous 35s Hot Start Autonomous 1s Hos u 4 Autonomous 2 5m orizontal P
16. t Altitude position float possibly signed lt ClkOffset gt Clock Offset of the receiver in Hz use O for last saved value if available If this is unavailable a default value of 75000 for GSP1 95000 for GSP1 LX will be used INT32 lt TimeOfWeek gt GPS Time Of Week UINT32 lt WeekNo gt GPS Week Number UINT16 ChannelCount Number of channels to use 1 12 UBYTE lt ResetCfg gt bit mask 0x01 Data Valid warm hot starts 1 0x02 clear ephemeris warm start 1 0x04 clear memory Cold start 1 UBYTE Example Start using known position and time PSRF104 37 3875111 121 97232 0 96000 237759 922 12 3 37 F Development Data On Off ID 105 Switch Development Data Messages On Off Use this command to enable development debug information if you are having trouble getting commands accepted Invalid commands will generate debug information that should enable 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 This setting is not preserved across a module reset 2010 7 15 18 ELE VA GlobalSat High Performance GPS Engine Board Wired by Wireless Format PSRF105 lt debug gt CKSUM lt CR gt lt LF gt lt debug gt 0 Off 1 On Example Debug On PSRF105 1 3E Example Debug Off PSRF105 0 3F G Select Datum ID 106 Selection of datum to be used for coordinate Transformations GPS recei
17. t TimeOfWeek gt lt WeekNo gt lt chniCount gt lt ResetCfg gt CK SUM lt CR gt lt LF gt lt X gt X coordinate position INT32 lt Y gt Y coordinate position INT32 lt Z gt Z coordinate position INT32 lt ClkOffset gt Clock offset of the receiver in Hz Use 0 for last saved value if available If this is unavailable a default value of 75000 for GSP1 95000 for GSP 1 LX will be used INT32 lt TimeOf Week gt GPS Time Of Week UINT32 lt WeekNo gt GPS Week Number UINT16 Week No and Time Of Week calculation from UTC time chnlCount Number of channels to use 1 12 If your CPU throughput is not high enough you could decrease needed throughput by reducing the number of active channels UBYTE lt ResetCfg gt bit mask 0x01 Data Valid warm hotstarts 1 0x02 clear ephemeris warm start 1 0x04 clear memory Cold start 1 UBYTE Example Start using known position and time PSRF101 2686700 4304200 3851624 96000 497260 921 12 3 7F C Set DGPS Port ID 102 Set PORT B parameters for DGPS input This command is used to control Serial Port B that is an input only serial port used to receive RTCM differential corrections Differential receivers may output corrections using different communication parameters The default communication parameters for PORT B are 9600Baud 8data bits 0 stop bits and no parity If a DGPS receiver is used which has different communication parameters
18. vers 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 Examples Datum select TOKYO_MEAN PSRF106 178 32 2010 7 15 19 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless PCB Layout Recommend Recommended Layout PAD 16 0 Unit mm Tolerance 0 1mm PCB Layout Recommendations Do not routing the other signal or power trace under the engine board RF This pin receives signal of GPS analog via external active antenna It has to be a controlled impedance trace at 50ohm Do not place the RF traces close to the other signal path and not routing it on the top layer Keep the RF traces as short as possible Antenna Keep the active antenna on the top of your system and confirm the antenna radiation pattern axial ratio power gain noise figure VSWR are correct when you Setup the antenna in your case 2010 7 15 20 ET 318 VA GlobalSat High Performance GPS Engine Board Wired by Wireless Recommended Reflow Profile Temperature C 240 C Max 150210C
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