环天 GPS导航设备-EM-408说明书.pdf

发布时间：2022-05-13 发布人：admin 分类：说明书资料大小：0.25M 资料格式：pdf 举报版权申诉

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General

Accuracy

Datum

Acquisition Time

Dynamic Conditions

Power

Interface

Environmental

Dimensions

Pin Assignment

SOFTWARE COMMAND

NMEA Output Command

Units

環天衛星科技股份有限公司 PRODUCT USER MANUAL GPS ENGINE BOARD EM-408 GlobalSat Technology Corporation 台北縣中和市建一路 186 號 16 樓(遠東世紀廣場) 16F ,No.186,Chien 1 Road, 235Chung Ho City,Taipei Hsien, Taiwan ,R.O.C.

SiRF StarⅢ L1, 1575.42 MHz 1.023 MHz chip rate 20 channel all-in-view tracking -159 dBm Tel: 886-2-8226-3799(Rep.) Fax: 886-2-8226-3899 Web: www.globalsat.com.tw E-mail: service@globalsat.com.tw Features: SiRF starⅢ high performance GPS Chip Set Very high sensitivity (Tracking Sensitivity: -159 dBm) Extremely fast TTFF (Time To First Fix) at low signal level Compact size (36.4mm * 35.4 mm * 8.3mm) suitable for space-sensitive application Support NMEA 0183 and SiRF binary protocol Specification: General Chipset Frequency C/A code Channels Sensitivity Accuracy Position Velocity Time Datum Default Acquisition Time Reacquisition Hot start Warm start Cold start Dynamic Conditions Altitude Velocity Acceleration 10 meters, 2D RMS 5 meters, 2D RMS, WAAS enabled 0.1 m/s 1us synchronized to GPS time 18,000 meters (60,000 feet) max 515 meters /second (1000 knots) max Less than 4g 0.1 sec., average 1 sec., average 38 sec., average 42 sec., average WGS-84

Jerk Power Main power input Power consumption Interface Dimension Baud rate Electrical level Output message Environmental Operating Temp 20m/sec **3 3.3V DC input 75mA (Continuous mode) 36.4mm * 35.4mm * 8.3mm 4,800 to 57,600 bps adjustable TTL level, Output voltage level: 0V ~ 2.85V SiRF binary or NMEA 0183 GGA, GSA, GSV, RMC, VTG, GLL -40℃ to +85℃

Dimensions

This is the main DC supply for a 3.3V DC input power module board. This is the main transmits channel for outputting navigation and measurement This is the main receive channel for receiving software commands to the engine Pin Assignment Pin description * VIN (DC power input): * GPS-TX: data to user’s navigation software or user written software. * GPS-RX: board from SiRFdemo software or from user written software. * GND: Output TTL level, 0V ~ 2.85V GND provides the ground for the engine board. Connect all grounds. * Enable/Disable: On/Off

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 $GPGGA Message ID 161229.487 UTC Time 3723.2475 Latitude N N/S Indicator 12158.3416 Longitude E/W Indicator W Position Fix Indicator 1 07 Satellites Used 1.0 HDOP MSL Altitude1 9.0 M Units Geoid Separation1 M Units Age of Diff. Corr. 0000 Diff. Ref. Station ID *18 Checksum Units Description GGA protocol header hhmmss.sss ddmm.mmmm N=north or S=south dddmm.mmmm E=east or W=west See Table B-3 Range 0 to 12 Horizontal Dilution of Precision meters meters meters meters second Null fields when DGPS is not used End of message termination SiRF Technology Inc. does not support geoid corrections. Values are WGS84 ellipsoid heights. Table B-3 Position Fix Indicator Value 0 1 2 3 Description Fix not available or invalid GPS SPS Mode, fix valid Differential GPS, SPS Mode , fix valid GPS PPS Mode, fix valid

GLL-Geographic Position-Latitude/Longitude Table B-4 contains the values for the following example: $GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C Table B-4 GLL Data Format Name Units Message ID Latitude N/S Indicator Longitude E/W Indicator UTC Position Status Checksum Description GLL protocol header ddmm.mmmm N=north or S=south dddmm.mmmm E=east or W=west hhmmss.sss A=data valid or V=data not valid Example $GPGLL 3723.2475 n 12158.3416 W 161229.487 A *2C 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 Message ID Mode1 Mode2 Satellite Used1 Satellite Used1 ….. Satellite Used1 PDOP HDOP VDOP Checksum Example $GPGSA A 3 07 02 1.8 1.0 1.5 *33 Units Description GSA protocol header See Table B-6 See Table B-7 Sv on Channel 1 Sv on Channel 2 Sv on Channel 12 Position dilution of Precision Horizontal dilution of Precision Vertical dilution of Precision End of message termination Satellite used in solution. 1. Table B-6 Mode1 Description Value M A Manual-forced to operate in 2D or 3D mode 2Dautomatic-allowed to automatically switch 2D/3D Table B-7 Mode 2 Value 1 2 3 Description Fix Not Available 2D 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 Name Message ID Number of Messages1 Message Number1 Satellites in View Satellite ID Elevation Azimuth SNR(C/No) ……. Satellite ID Elevation Azimuth SNR(C/No) Checksum Example $GPGSV 2 1 07 07 79 048 42 27 27 138 42 *71 Description GSV protocol header Range 1 to 3 Range 1 to 3 degrees degrees dBHz Channel 1(Range 1 to 32) Channel 1(Maximum90) Channel 1(True, Range 0 to 359) Range 0 to 99,null when not tracking ……. Channel 4 (Range 1 to 32) Degrees Channel 4(Maximum90) Degrees Channel 4(True, Range 0 to 359) dBHz Range 0 to 99,null when not tracking End of message termination Depending on the number of satellites tracked multiple messages of GSV data may be required. RMC-Recommended Minimum Specific GNSS Data 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 Example Units End of message termination Description RMC protocol header hhmmss.sss A=data valid or V=data not valid ddmm.mmmm N=north or S=south dddmm.mmmm E=east or W=west Name Message ID UTC Time Status Latitude N/S Indicator Longitude E/W Indicator Speed Over Ground Course Over Ground Date Magnetic Variation2 Checksum SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are geodetic WGS48 directions. $GPRMC 161229.487 A 3723.2475 N 12158.3416 W 0.13 309.62 120598 *10 True ddmmyy E=east or W=west knots degrees degrees

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