常天 GPS导航设备-GPS-25说明书.pdf-资料库

Rikaline GPS-25 GPS Board User’s Guide SiRF Star III V1.0 Feb 20, 2006 Rikaline International Corp. 14F, 171, Chen-Gong Road, San-Chong City, Taipei 241, Taiwan Phone: +886-2-8973-1899 Fax: +886-2-8973-1896 E-Mail: info@rikaline.com.tw Web: www.rikaline.com.tw All Right Reserved

GPS-25 Operating Manual Rikaline TABLE OF CONTENTS 3 3 3 3 1. Introduction ……………………………………………………………………………………….. 1.1 Overview …………………………………………………………………………………….. 1.2 Features …………………………………………………………………………………….. 1.3 Technical Specifications ……………………………………………………………….. 2. Operational Characteristics ……………………………………………………………….… 5 5 5 2.1 Initialization …………………………………………………………………………………. 2.2 Navigation …………………………………………………………………………………. 3. Hardware Interface ………………………………………………………………………….…… 6 3.1 Physical Characteristics ……………………………………………………………….… 6 3.2 Hardware …..…………………..……………………………………………………….…… 6 3.3 Connector ………………………………………………………………………………….… 6 3.4 Pad Assignment …………………………………………………………………………… 6 3.5 Other function description …………………………………………..………………… 8 4. Software Interface …………………………………………………………………………….… 9 4.1 NMEA Transmitted Sentences ……………………………………………………..… 9 4.2 RTCM Received Data ………………………………………………………………….. 12 5. Earth Datums & Output Setting ……………………………………………………………. 13 5.1 Earth Datums ……………………………………………………………………………….. 13 5.2 Output Setting …………………………………………………………………………….… 13 6. Ordering Information ………………………………………………………………………..… 14 6.1 Product Options ………………………………………………………………….………… 14 6.2 Accessories ………………………………………………………………………….……… 14 7. Warranty ……………………………………………………………………………………………… 18 Rikaline International Corp. 14F, 171, Cheng-Gong Road, SanChung City, Taipei 241, Taiwan Tel: ++886 2 8973 1899 Fax: ++886 2 8973 1896 E-Mail: info@rikaline.com.tw web: www.rikaline.com.tw 2

GPS-25 Operating Manual Rikaline 1. Introduction 1.1 Overview The Rikaline GPS-25 GPS Engine Board is designed based on SiRF Star III new generation architecture with low power consumption, small size and easy integrated for a broad spectrum of OEM system applications. It acquires satellite 20 channel parallel and tracking 12 at a time. The 200,000 effective correlators ensure fast TTFF and fast TTFF at low signal level. The GPS-25 meets strict needs such as car navigation, mapping, surveying, security, agriculture and so on. Only clear view of sky and certain power supply are necessary to the unit. It communicates with other electronic utilities via compatible TTL and saves critical satellite data by built–in backup memory. The Trickle-Power allows the unit operates a fraction of the time and Push-to-Fix permits user to have a quick position fix even though the receiver usually stays off. For flexible design of your system, we provide you GPS-25 with embedded passive antenna and active antenna connector on board. There is an electric switch between the 2 type antennas to maximize the advanced performance. 1.2 Features The GPS-25 provides a host of features that make it easy for integration and use. 1. SiRF Star III chipset with embedded ARM7TDMI CPU available for customized applications in 2. High performance receiver acquires 20 channel parallel and tracks up to 12 satellites while providing first fast fix and low power consumption. 3. Differential capability utilizes real-time RTCM corrections producing 1-5 meter position accuracy. 4. Compact design ideal for applications with minimal space. 5. A rechargeable battery sustains internal clock and memory. The battery is recharged during normal 6. User initialization is not required. 7. Dual communication channels and user selectable baud rates allow maximum interface capability and firmware. operation. flexibility. 8. Optional customer design for any possible size down to 16 x 20mm. 9. FLASH based program memory: New software revisions upgradeable through serial interface. 10. Built-in WAAS and EGNOS demodulator (optional software). 1.3 Technical specifications 1.3.1 Physical Characteristics Dimension: 42(L) x 32(W) x 10.5(H) mm 1.65"(L) x 1.26"(W) x 0.41"(H). Weight: 33g 1.3.2 Environmental Characteristics 1) Operating temperature: -40oC to +85oC 2) Storage temperature: -55oC to +100oC. 1.3.3 Electrical Characteristics Input voltage: +3.0 ~ 6.0 VDC 1) 2) Backup power: 3V Rechargeable Lithium cell battery, up to 230 hours (9.5 days) discharge. Rikaline International Corp. 14F, 171, Cheng-Gong Road, SanChung City, Taipei 241, Taiwan Tel: ++886 2 8973 1899 Fax: ++886 2 8973 1896 E-Mail: info@rikaline.com.tw web: www.rikaline.com.tw 3

GPS-25 Operating Manual Rikaline 1.3.4 Performance 1) Acquisition: 20 channel parallel 2) Tracking: up to 12 satellites 3) Update rate: 1 second 4) Acquisition time Reacquisition 0.1 sec., averaged Snap Start 3 sec, averaged 6 sec, averaged 38 sec., averaged 42 sec., averaged 4) Position accuracy: Hot start Warm start Cold start A) Non DGPS (Differential GPS) Position Velocity Time <10 M at 2D RMS 0.1 meters/second, with SA off 1 microsecond synchronized GPS time B) DGPS (Differential GPS) or WAAS / EGNOS 1 ~ 5 meter, typical 0.05 meters/second, typical Position Velocity 5) Dynamic Conditions: 6) Time Mark PPS Altitude Velocity Acceleration Jerk 18,000 meters (60,000 feet) max 515 meters / second (1000 knots) max 4 G, max 20 meters/second, max TTL Level Pulse Duration 100ms Time Reference at the pulse positive edge Measurements Aligned to GPS second, ± 1 microsecond 1.3.5 Interfaces 1) Dual channel TTL compatible level, with user selectable baud rate (4800, 9600-Default, 19200, 38400). 2) NMEA 0183 Version 2.2 ASCII output (GPGGA, GPGLL, GPGSA, GPGSV, GPRMC, GPVTG). 3) SiRF protocol--- Position, Velocity, Altitude, Status and Control Rikaline International Corp. 14F, 171, Cheng-Gong Road, SanChung City, Taipei 241, Taiwan Tel: ++886 2 8973 1899 Fax: ++886 2 8973 1896 E-Mail: info@rikaline.com.tw web: www.rikaline.com.tw 4

2. Operational characteristics GPS-25 Operating Manual Rikaline 2.1 Initialization As soon as the initial self-test is complete, the GPS-25 begins the process of satellite acquisition and tracking automatically. Under normal circumstances, it takes approximately 42 seconds to achieve a position fix, 38 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-25 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 GPS-25 Auto-locate feature is capable of automatically determining a navigation solution without intervention from the host system. 2.2 Navigation After the acquisition process is complete, the GPS-25 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-25 sets the default of auto-searching for real-time differential corrections in RTCM SC-104 standard format, with the message types 1, 5, or 9. It accomplishes the satellite data to generate a differential (DGPS) solution. The host system, at its option, may also command the GPS-25 to output a position whenever a differential solution is available. Rikaline International Corp. 14F, 171, Cheng-Gong Road, SanChung City, Taipei 241, Taiwan Tel: ++886 2 8973 1899 Fax: ++886 2 8973 1896 E-Mail: info@rikaline.com.tw web: www.rikaline.com.tw 5

GPS-25 Operating Manual Rikaline 3. Hardware interface 3.1 Physical Characteristics Dimension: 42(L) x 32(W) x 10.5(H) mm 1.65"(L) x 1.26"(W) x 0.41"(H). Dimension in mm Weight: 17.6g 3.2 Hardware 3.3 Connectors 3.3.1 Antenna Connector It is designed with MMCX for active antenna. 3.3.2 Interface Connector 10 pin connector with 1.27mm pitch. 3.4 Pin Assignment Table 3-1 Pin definition of the 10 Digital Interface Pad Number Name Description 1 2 3 4 5 6 7 8 VCC IN BACKUP BAT GND RX (TTL) TX (TTL) PPS / DGPS GPIO GPS STATE 3-6Vdc For backup battery Ground Serial data input Serial data output One of these functions active at a time Spare I\O for customer software For LED indication Rikaline International Corp. 14F, 171, Cheng-Gong Road, SanChung City, Taipei 241, Taiwan Tel: ++886 2 8973 1899 Fax: ++886 2 8973 1896 E-Mail: info@rikaline.com.tw web: www.rikaline.com.tw 6

GPS-25 Operating Manual Rikaline 9 10 P-T-F RESET Table 3-2 Operating Conditions Parameter Power Supply Voltage Power Supply Voltage Operating Temperature Operating Current Symbol VCC IN BACKUP BAT TOPR ICC Table 3-3 Battery Conditions Parameter RTC (Battery) Power Supply Current Symbol BACKUP BAT PUSH-TO-FIX System Restart Min 3.0 1.4 -40 Min 1.4 Type 5.0 1.5 90 Typ 1.5 10 Max 6.0 1.6 85 Max 1.6 Units V V ºC mA Units V µA 3.4.1 VCC IN It power range is from 3.0Vdc to 6.0Vdc. 3.4.2 BACKUP BAT 3.4.3 GND It requires 1.5Vdc and the function is to keep the GPS clock running in the system for quick position fix next time. The GND provides the ground for the board. All GND should be connected. 3.4.4 Rx (TTL) This pad is for data Input to control the GPS output or GPS system setting 3.4.5 Tx (TTL) It outputs standard NMEA 0183 V2.2 sentences, SiRF binary or either one of NMEA and SiRF binary 3.4.6 DGPS / PPS Time mark (R7 DGPS / R10 PPS) This pin can have one function of the two active. If the on-board resistance, R7 connected and R10 Open, pin 6 accepts DGPS signal. If R7 open and R10 connected, it outputs PPS signal. Real-time Differential Correction input (RTCM SC-104 version 2.00 message types 1, 5 and 9). For use with Radio-Beacon for positioning correction. It always requires baud rate at 9600. 3.4.6.1 DGPS 3.4.6.2 PPS Time Mark This function provides 1 pulse per second output from the board, which is synchronized to within 1 microsecond of GPS time. The output is a CMOS (TTL) level signal. 3.4.7 SPARE GPIO Functions This I/Os of CPU is connected to the digital interface connector for consumer applications. 3.4.8 GPS LED To have GPS positioning status visible. Default: Blinking (Power ON) and ON (position fix) 3.4.9 Push-to-Fix Description The Push-to-Fix mode is for the applications that requires infrequent position reporting. The receiver generally stays in a low-power mode, up to 2 hours, but wakes up periodically to refresh position, time, ephemeris data and RTC calibration. A position request acts as a wakeup to the receiver, which is then able to supply a position within the hot-start time specification. Rikaline International Corp. 14F, 171, Cheng-Gong Road, SanChung City, Taipei 241, Taiwan Tel: ++886 2 8973 1899 Fax: ++886 2 8973 1896 E-Mail: info@rikaline.com.tw web: www.rikaline.com.tw 7

GPS-25 Operating Manual Rikaline 3.4.10 RESET This function provides an active-low reset input to the board. It causes the board to reset and start searching for satellites. It is an optional input and, if not utilized, it may be left open. 3.5 Other Function Description 3.5.1 TricklePowerTM In this state, the CPU is in a low power standby state and the receiver clocks are off with only the Description RTC clock active. After a set amount of time, the RTC generates an NMI signal to wake up the ARM-7 microprocessor and reset the receiver back to tracking state. Rikaline International Corp. 14F, 171, Cheng-Gong Road, SanChung City, Taipei 241, Taiwan Tel: ++886 2 8973 1899 Fax: ++886 2 8973 1896 E-Mail: info@rikaline.com.tw web: www.rikaline.com.tw 8

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常天 GPS导航设备-GPS-25说明书.pdf

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