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EM-318-01

Specifications are subject to be changed without notice.

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Version 1.2.2

3. SOFTWARE COMMAND

■

NMEA Output Command

GGA-Global Positioning System Fixed Data

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=north or S=south

Longitude

12158.3416

dddmm.mmmm

E/W Indicator

E=east or W=west

Position Fix Indicator

See Table B-3

Satellites Used

Range 0 to 12

HDOP

1.0

Horizontal Dilution of Precision

MSL Altitude

9.0

meters

Units

meters

Geoid Separation

meters

Units

meters

Age of Diff. Corr.

second

Null fields when DGPS is not used

Diff. Ref. Station ID

0000

Checksum

*18

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

Fix not available or invalid

GPS SPS Mode, fix valid

Differential GPS, SPS Mode , fix valid

GPS PPS Mode, fix valid

Содержание EM-318-01

Страница 1: ...M 318 01 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 service globalsat com tw www globalsat com tw USGlobalSat Inc 14740 Yorba Court Chino CA 91710 Tel 909 597 8525 Fax 909 597 8532 oem usglobalsat com www usglobalsat com ...

Страница 2: ... other GPS applications Product Features 9 SiRF GSC3f LP chipset 9 20 parallel channels 9 Extremely fast TTFFs at low signal levels 9 1 serial ports 9 Built in LNA with built in on board patch antenna 9 NMEA 0183 v3 01 Default GGA GSA GSV RMC SiRF NMEA Command 9 SBAS WAAS and EGNOS and MSAS support 9 ARM 7 TDMI microprocessor 9 RoHS compliant Product Specifications GPS Receiver Chipset SiRF Star I...

Страница 3: ...MSAS Interface I O Connector Type 10 pin Molex Micro Miniature 1 25mm External Antenna Port MMCX Physical Characteristic Dimensions 1 2 x 1 2 x 0 37 30 x 30 x 9 5 mm DC Characteristics Power Supply 3 3V 5 5V 5 Backup Voltage 2 0 3 6V Power Consumption Tracking 45mA Environmental Range Humidity Range 5 to 95 non condensing Operation Temperature 22F to 185F 30C to 85C Storage Temperature 40F to 257F...

Страница 4: ...EM 318 01 Specifications are subject to be changed without notice Page 4 of 16 Version 1 2 2 2 Technical Information Block Diagram ...

Страница 5: ...that powers the SRAM and RTC when main power is removed Typical current draw is 15uA Without an external backup power supply the GPS module engine board will execute a cold star upon each power up To achieve the faster start ups a backup must be connected to this pin battery or Gold Super capacitor The voltage should be between 2 0v and 5 0v NOTE The VBAT pin must be kept HIGH for in order for the...

Страница 6: ...be changed without notice Page 6 of 16 Version 1 2 2 Molex Micro Miniature 1 25mm Connectors 10 Pin Connector Digi Key Part No WM1728 ND Molex Part No 51021 1000 28 32 AWG Crimp Digi Key Part No WM1775 ND WM1775TR ND Molex Part No 50058 8000 ...

Страница 7: ...EM 318 01 Specifications are subject to be changed without notice Page 7 of 16 Version 1 2 2 Dimensions ...

Страница 8: ...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 Satellites Used 07 Range 0 to 12 HDOP 1 0 Horizontal Dilution of Precision MSL Altitude1 9 0 meters Units M meters Geoid Separation1 meters Units M meters Age of Diff Corr second Null fields when DGPS is not used Diff Ref Station ID 0000 Checksum 18 CR LF End of message termin...

Страница 9: ...229 487 hhmmss sss Status A A data valid or V data not valid Checksum 2C CR LF 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 Mode1 A See Table B 6 Mode2 3 See Table B 7 Satellite Used1 07 ...

Страница 10: ... 041 42 41 Table B 8 GSV Data Format Name Example Units Description Message ID GPGSV GSV protocol header Number of Messages1 2 Range 1 to 3 Message Number1 1 Range 1 to 3 Satellites in View 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 35 SNR C No 42 dBHz Range 0 to 99 null when not tra Satellite ID 27 Channel 4 Ra...

Страница 11: ... W west Speed Over Ground 0 13 knots Course Over Ground 309 62 degrees True Date 120598 ddmmyy Magnetic Variation2 degrees E east or W west Checksum 10 CR LF End of message termination SiRF Technology Inc does not support magnetic declination All course over ground data are Geodetic WGS48 directions VTG Course Over Ground and Ground Speed GPVTG 309 62 T M 0 13 N 0 2 K 6E Table B 9 VTG Data Format ...

Страница 12: ...put 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 is utilize to switch the GPS module back to SiRF Binary protocol mode where an extensive message commands are readily available In example whenever users are inter...

Страница 13: ...d satellite data will enable the receiver to acquire signals more quickly and thus generate a rapid navigational solution When a valid Navigation Initialization command is receive the receiver will restart using the input parameters as a basis for satellite selection and acquisition Format PSRF101 X Y Z ClkOffset TimeOfWeek WeekNo chnlCount ResetCfg CKSUM CR LF X X coordinate position INT32 Y Y co...

Страница 14: ... CKSUM CR LF baud 1200 2400 4800 9600 19200 38400 DataBits 8 StopBits 0 1 Parity 0 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 standard NMEA data output messages GGA GLL GSA GSV RMC and VTG Using this command message standard NMEA message is polled once ...

Страница 15: ...loat possibly signed Lon Longitude position it is assumed positive east of Greenwich and negative west of Greenwich Float possibly signed Alt Altitude position float possibly signed ClkOffset 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 GSP1 LX is used INT32 TimeOfWeek GPS Time Of Week UINT32 WeekNo GP...

Страница 16: ...CEF 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 Datum Local map Datum are a best fit to the local shape of the earth and not valid worldwide Examples Datum select TOKYO_MEAN PSRF106 178 ...

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