环天 GPS导航设备-ET-212说明书.pdf

发布时间：2022-05-13 发布人：admin 分类：说明书资料大小：0.15M 资料格式：pdf 举报版权申诉

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Globalsat Technology Corporation PRODUCT USER MANUAL GPS ENGINE BOARD ET-212 version 1.2 GlobalSat Technology Corporation 16, No.186,Chien 1 Road, 235Chung Ho City,Taipei Hsien, Taiwan ,R.O.C. Tel: 886-2-8226-3799(Rep.) Fax: 886-2-8226-3899 Web: www.globalsat.com.tw E-mail: service@globalsat.com.tw

SiRF GSC2x L1, 1575.42 MHz 1.023 MHz chip rate 12 channel all-in-view tracking -155 dBm Features: SiRF GSC2x high performance GPS Chip Set Very high sensitivity (Tracking Sensitivity: -155 dBm) Extremely fast TTFF (Time To First Fix) at low signal level Compact size (27.9mm * 20 mm * 3.4mm) suitable for space-sensitive application One size component, easy to mount on another PCB board 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 Jerk 18,000 meters (60,000 feet) max 515 meters /second (1000 knots) max Less than 4g 20m/sec **3 10 meters, 2D RMS 5 meters, 2D RMS, WAAS enabled 0.1 m/s 1us synchronized to GPS time 0.1 sec., average 8 sec., average 38 sec., average 45 sec., average WGS-84

Power Main power input Power consumption Interface Dimension Baud rate Output message Antenna Environmental Operating Temp 3.3V +- 5% DC input 42 mA (With antenna) 27.9mm * 20mm * 3.4mm 4,800 to 57,600 bps adjustable SiRF binary or NMEA 0183 GGA, GSA, GSV, RMC, VTG, GLL Active antenna -40℃ to +85℃

Pin Assignment Pin description * RF: * VIN (DC power input): * BATTERY (Backup battery): power is removed. Typical current draw is 15uA. Without an external backup battery, This is the main DC supply for a 3.3V +- 5% DC input power module board. Connect to External Active Antenna This is the battery backup input that powers the SRAM and RTC when main

User can use this I/O pin for special function. For example, on/off LED the module/engine board will execute a cold star after every turn on. To achieve the faster start-up offered by a hot or warm start, a battery backup must be connected. The battery voltage should be between 2.0v and 5.0v. * GPIO13: * TX: data to user’s navigation software or user written software. * RX: board from SiRFdemo software or from user written software. * GND: This is the main receive channel for receiving software commands to the engine This is the main transmits channel for outputting navigation and measurement Output TTL level, 0V ~ 2.85V GND provides the ground for the engine board. Connect all grounds. Application Circuit

Recommend Layout PAD

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

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