常天 GPS导航设备-GPS-22说明书.pdf

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1.3.1 Industry Leading GPS Performance

1.3.2 Low Power

1.5.4 Functional Block Diagram

Reacquisition 0.1 sec. (90%)

Velocity0.1 meters/second.

Altitude 18,000 meters(60,000 feet) max

Acceleration 4 G, max

3.2 Pin Definition

USPED

STY1

3.3 Operating Modes

NMEA Record

GPGGA

Example

Units

Value

Description

4.1.2 Geographic Position with Latitude/Longitude (GLL)

4.1.3 GNSS DOP and Active Satellites (GSA)

Example

Units

Value

Description

Value

Description

4.1.4 GNSS Satellites in View (GSV)

Example

Units

4.1.5 Recommended Minimum Specific GNSS Data (RMC)

Example

Units

Description

4.1.6 Course Over Ground and Ground Speed (VTG)

Example

Units

4.1.7 Time & Date (ZDA)

Example

Units

4.3.2.2 DI – Diagnostic Message $optional$

4.3.2.3 NM – Sentence Mask and Automatic Output

Sentence Bit# Field value

4.3.2.4 PS – Pulse-Per-Second Configuration

4.3.2.5 PT – Port Configuration

4.3.2.6 RT – Reset the Receiver / Start-Stop Fir

4.3.2.7 VR – Version Information $optional$

4.3.2.8 TR – Transparent Mode

4.4 DEFAULT Setting Details

4.4.1 Pulse Per Second Signal

4.4.2 Receiver configuration

4.4.3 FILTER configuration

4.4.4 OFFSET configuration

4.4.5 NMEA configuration

4.4.6 APPlication settings

4.5 Application Information

4.5.1 Antenna recommendation

GPS-22 GPS Receiver Module User’s Guide FirstGPS V1.0 Jun 28, 2003 Positioning Accuracy: 3m CEP (50%) or <5m CEP ((90%) Low Power: 17mA typical -- tracking at 3.3 Volts, full power

GPS-22 Operating Manual TABLE OF CONTENTS 1. Introduction ………………………………………………………………………….………… 3 3 1.1 Overview ………………………………………………………………………………………. 1.2 Features ……………………………………………………………………………….………. 3 1.3 FirstGPS Architecture Highlights …………………………………………………………… 3 1.4 Application …………………………………………………………………………………….. 3 1.3 Technology specifications ………………………………………………………………….… 3 5 2. Operational Characteristic ………………………………………………………………. 5 2.1 Initialization …………………………………………………………………………………… 2.2 Navigation …………………………………………………………………………………….. 5 3. Hardware Interface …….……………………………………………………………………. 6 6 3.1 Physical Characters ………………………………………………………………………… 6 3.2 Pin Definition ………………………………………………………………………………… 4. Software Interface ……………..…………………………………………………….………. 8 4.1 NMEA Transmitted Message ……………………………………………………….………. 8 4.2 RTCM Received Data ………………..…………………………………………………….. 11 4.3 Syntax Setting ………………………………………………………………………………… 11 4.4 Default Setting Details ………………………………………………………………………… 14 4.5 Application Information ……………………………………………………………………… 15 5. Earth Datums ………………………………………………………………………………….. 16 5.1 Earth Datums ………………………………………………………………………………… 16 6. Ordering Information ………………………………………………………………………. 16 6.1 Products Options ……………………………………………………………………..……… 16 6.2 Accessories ……………………………………………………………………..…………….. 16 7. Warranty …………………………………………………………………………..…………….. 16 Specifications subject to change without prior notice 2

GPS-22 Operating Manual 1. Introduction 1.1 Overview The GPS-22 GPS Receiver is a GPS receiver featuring the revolutionary FirstGPS™ architecture. This complete enabled GPS receiver module provides high position and speed accuracy performances as well as high sensitivity and tracking capabilities in urban canyon conditions. The solution enables small form factor package. The GPS-22 delivers major advancements in GPS performances, accuracy, integration, computing power and flexibility. It is designed to simplify the embedded system integration process. This positioning application meets strict needs such as car navigation, mapping, surveying, agriculture and so on. Only clear view of sky and certain power supply are necessary to the unit. GPS-22 communicates with other electronic utilities via compatible dual-channel through TTL and saves critical satellite data in built–in memory backup. With low power consumption, the GPS-22 tracks up to 8 satellites at a time, re-acquires satellite signals in 100 ms and updates position data every second. 1.2 Features The GPS-22 provides a host of features that make it easy for integration and use. 1. Position accuracy in < 3m CEP (50%) or <5m CEP ((90%) without SA (horizontal) 2. Ultra low power: 17mA typical -- tracking at 3.3 Volts, full power 3. High sensitivity: to -143 dBm tracking, superior urban canyon performances 4. Small form factor and low cost solution 5. Ready-to-plug solution. Easily integrated into existing systems 6. On-board RAM for GPS navigation data 7. PPS output (User may have different interval setting from 1 second to 1 minute. 8. Differential capability utilizes real-time RTCM corrections producing < 1 meter position accuracy. 9. FLASH based program memory: New setting is stored permanently. 1.3 FirstGPS Architecture Highlights 1.3.1 Industry Leading GPS Performance core - Builds on high performance FirstGPSTM - Satellite signal tracking engine to perform GPS acquisition and tracking functions without CPU intervention - High sensitivity: to -143 dBm tracking, superior urban canyon performances - Position accuracy: < 3m CEP (50%) without SA (horizontal) - Warm Start is under 42 seconds (90%) - Hot Start is under 10 seconds (90%) 1.3.2 Low Power - Ultra low power integrated circuit design, optimized RF and DSP architectures - Further power saving thanks to 4 different power down mode 1.4 Application 1. Car Navigation 2. Mapping 3. Surveying 4. Agriculture 5. Palmtop, Laptop, PDA 6. Location Based Services enabled devices 7. Asset management/tracking 8. Handheld receivers 1.5 Technology specifications 1.5.1 Physical Dimension 1. Size: 31.59(W) x 26.59(D) x 11.20(H) (mm) 1.24”(W) x 1.05”(D) x 0.44”(H) 2. Weight: 25 g Remark: FirstGPS™ is the trademark from Trimble Specifications subject to change without prior notice 3

GPS-22 Operating Manual ANT ANT Input voltage: +3.0 ~ 3.65 VDC. 1.5.2 Environmental Characteristics 1) Operating temperature: -40oC to +85oC (internal temperature) 2) Storage temperature: -55oC to +100oC 1.5.3 Electrical Characteristics 1) 2) HFL antenna connector: Active or patch (3.0V antenna is recommended). 1.5.4 Functional Block Diagram 1.5.5 Performance 1) Tracks up to 8 satellites. 2) Update rate: 1 second. 3) Acquisition time: DOWN - DOWN - CONVERTER CONVERTER BASEBAND BASEBAND PROCESSOR PROCESSOR BP BP FILTER FILTER BP BP FILTER FILTER MCLKI MCLKI SCLK SCLK Q LPF Q LPF I LPF I LPF RF+ RF+ RF - RF - RF RF GPS GPS Active Antenna Active Antenna TCXO TCXO LNA LNA I I Q Q Reacquisition Hot start Warm start Cold start 4) Position accuracy: 0.1 sec. (90%) 10 sec. (90%) 42 sec. (90%) 120 sec. (90%) PVT PVT BOARD BOARD INTERFACE INTERFACE XE1610 - OEMPVT APPLICATION APPLICATION - RX RX TX TX API API FirstGPS FirstGPS SOFTWARE SOFTWARE RTOS RTOS Non DGPS (Differential GPS) Position Velocity Time DGPS (Differential GPS) <3m CEP (50%) or <5 m CEP (90%) 0.1 meters/second. 1 microsecond synchronized GPS time Position Velocity <1 m, typical 0.05 meters/second, typical 5) Dynamic Conditions: Altitude Velocity Acceleration Jerk 18,000 meters(60,000 feet) max 515 meters/second (1000 knots) max 4 G, max 20 meters/second³, max 1.5.6 Interfaces 1) Dual communication channel through TTL, with user selectable baud rate (2400, 4800-Default, 9600, 19200, 38400, 57600, 115200). 2) NMEA 0183 Version 2.1 ASCII output (GGA, GLL, GSV, GSA, RMC, VTG, ZDA). 3) Real-time Differential Correction input (RTCM SC-104 message types 1, 2 and 9). Specifications subject to change without prior notice 4

GPS-22 Operating Manual 2. Operational characteristics 2.1 Initialization As soon as the initial self-test is complete, the GPS-22 begins the process of satellite acquisition and tracking automatically. Under normal circumstances, it takes approximately 120 seconds to achieve a position fix, 42 seconds if ephemeris data is known. After a position fix has been calculated, information about valid position, velocity and time is transmitted over the output channel. The GPS-22 utilizes initial data, such as last stored position, date, time and satellite orbital data, to achieve maximum acquisition performance. If significant inaccuracy exists in the initial data, or the orbital data is obsolete, it may take more time to achieve a navigation solution. The FirstGPS™ architecture provides superior performance. However, acquisition performance can be improved as the host system initializes the GPS-22 in the following situation: 1. Moving further than 1,500 kilometers. 2. Failure of Data storage due to the inactive memory power back up. 2.2 Navigation After the acquisition process is complete, the GPS-22 sends valid navigation information over output channels. These data include: 1) Latitude/longitude/altitude 2) Velocity 3) Date/time 4) Error estimates 5) Satellite and receiver status The GPS-22 sets the default of auto-searching for real-time differential corrections in RTCM SC-104 standard format, with the message types 1, 2, or 9. It accomplishes the satellite data to generate a differential (DGPS) solution. The host system, at its option, may also command the GPS-22 to output a position whenever a differential solution is available. Specifications subject to change without prior notice 5

GPS-22 Operating Manual 3. Hardware interface 3.1 Physical Characters 1. Size: 31.59(W) x 26.59(D) x 11.20(H) (mm) 1.24”(W) x 1.05”(D) x 0.44”(H) 2. Weight: 25 g 3.1.1 Details Drawing 3.2 Pin Definition PIN 1 2 3 4 5 6 7 8 9 10 11 12 NAME GND ON/OFF VCC USPED RXA VRTCBK TXA PPS GND RESETN ALMRDY STY1 TYPE I I I O O I STY0 OSCSTOPN DESCRIPTION Power and Signal Ground ON / Off command line 3.0 to 3.6 Volts DC Input Power Supply 9600/4800 Bd UART Speed Serial Receive Data, Port A, GPS NMEA Data Back-up supply for the RTC Serial Transmit Data, Port A, GPS NMEA Data One Pulse Per Second timing output Power and Signal Ground Manual Reset, Active low 1(high): almanac valid; 0 (low): almanac not valid Blinking function, when position fix, output “low”. When tracking, output the interval signal “high/low”. N.C. For customer specific version N.C. Stand-by active “low” 13 14 15 16 1) All I/Os on the Data Interface are related to VCC (3 to 3.6 Volts) and GND levels. Specifications subject to change without prior notice 6

GPS-22 Operating Manual 2) ON/OFF: control the GPS engine “ON” or “OFF”. If this pin is pulled “HIGH” whenever a reset condition occurs or if it is turned “HIGH” during operating, the GPS engine is turned “ON”. If this pin is pulled “LOW” whenever a reset condition occurs, the GPS engine is not started. If this pin is turned “LOW” when in operating, the GPS engine is turned “OFF”. When ON/OFF is “LOW”, the on/off state can be superseded with the PXEMaRT manufacturer specific NMEA sentence on RXA, as defined below. 3) RXA and TXA: The Serial NMEA data port (RXA and TXA) is an asynchronous serial port (UART). 4) USPED: USPED “HIGH”: 9600 Baud rate, 8 bit data, no parity check, 1 stop bit and no flow control. USPED “LOW”: 4800 Baud rate, 8 bit data, no parity check, 1 stop bit and no flow control . This setting can be modified with the PXEMaPT manufacturer specific NMEA sentence defined later. 5) PPS: This is Pulse Per Second highly accurate timing signal generated by the on-board GPS base band processor at 83ms duration. After a reset condition, the default setting for this port is inactive. This setting can be modified with the PXEMaPS manufacturer specific NMEA sentence defined below. 6) RESETN: The receiver has 2 reset conditions: first, on power-on, thanks to an on-board Power On Reset circuitry; and second an external reset when the RESETN pin is “LOW”. 7) VCC: Main power supply. 8) VRTCBK: This is the back-up supply for the on-board real time clock. 9) ALMRDY: When in active mode, this indicates the on-board almanac status. Upon start up and whenever the almanac data are tested invalid or not up-to-date, the output level is “low”. If tested valid or up-to-date, the output level is “high” 10) STANDBYIN: This input sets the receiver in stand-by mode when its level is “low”. Otherwise, the receiver is either in active or power save mode. See below under operating modes for details. 3.3 Operating Modes Mode Description VCC pin On\Off Pin Standby Receiver is running, doing acquisition, tracking, position fixes GPS receiver functions are turned OFF, MCU in idle mode, MCU clock is running, RTC is running GPS receiver functions are turned OFF, MCU clock is stopped, RTC is running on the Back-up supply GPS receiver functions are turned OFF, MCU clock is stopped, RTC is running on the Back-up supply Powered High Powered No power Low (or thru NMEA command) low No power low pin High High low low Active Mode Power Save Mode Stand- by Mode Power Down Mode Current cons. Type. 17mA 2.2mA 300gA 1gA Specifications subject to change without prior notice 7

GPS-22 Operating Manual 4. Software Interface The GPS-22 interface protocol is based on the National Marine Electronics Association's NMEA 0183 ASC Ⅱinterface specification, which is defined in NMEA 0183, Version 2.1 and the Radio Technical Commission for Maritime Services (RTCM Recommended Standards For Differential Navstar GPS Service, Version 2.1, RTCM Special Committee No.104). 4.1 NMEA Transmitted Messages The GPS-22 outputs data in NMEA-0183 format as defined by the National Marine Electronics Association (NMEA), Standard. The default communication parameters for NMEA output are 9600/4800 baud, 8 data bits, stop bit, and no parity. Table 4-1 NMEA-0183 Output Messages NMEA Record Description GPGGA GPGLL GPGSA GPGSV GPRMC GPVTG GPZDA Global positioning system fixed data Geographic position- latitude/longitude GNSS DOP and active satellites GNSS satellites in view Recommended minimum specific GNSS data Course over ground and ground speed Date & Time 4.1.1 Global Positioning System Fix Data (GGA) $GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M, , , ,0000*18 Table 4-2 GGA Data Format Name Message ID UTC Time Latitude N/S Indicator Longitude E/W Indicator Position Fix Indicator Satellites Used HDOP MSL Altitude Units Geoid Separation Units Age of Diff. Corr. Diff. Ref. Station ID Checksum Example $GPGGA 161229.487 3723.2475 12158.3416 N W 1 07 1.0 9.0 M M 0000 *18 Table 4-3 Position Fix Indicator Units Description GGA protocol header Hhmmss.sss Ddmm.mmmm N=north or S=south dddmm.mmmm E=east or W=west See Table 5-3 Range 0 to 12 Horizontal Dilution of Precision Meters Meters Meters Meters second Null fields when DGPS is not used End of message termination Value 0 1 2 3 0 Fix not available or invalid GPS SPS Mode, fix valid Differential GPS, SPS Mode, fix valid GPS PPS Mode, fix valid Description 4.1.2 Geographic Position with Latitude/Longitude (GLL) Table 4-4 contains the values for the following example: Specifications subject to change without prior notice 8

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