PRODUCT USER MANUAL
GPS ENGINE BOARD
SR-87
ProGin Technology Inc.
12F-1,No.5,Lane 7,De-an St.,Lingya District,
Kaohsiung 802,Taiwan
TEL：886-7-7278885 WEB：www.progin.com.tw
FAX：886-7-7214117 E-mail：info@progin.com.tw
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Contents
1. Introduction ……………………………………………………..…………. 2
1.1 Overview …………………………………………………………………. 2
2. Technical Specifications …………………………………………………… 3
2.1. Electrical Characteristics…………………………………………………. 3
2.2. Environmental Characteristics……………………………………..……… 4
2.3. Physical Characteristics……………………………………………...…..… 5
3. Applications ……………………………………………………………… 7
4. Operation and Test (optional)………………..…………… 7
Appendix: Software Specifications …………………………………….. 8
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1. Introduction
1.1. Overview
Product Introduction
The ProGin SR-87 series GPS modules incorporates high sensitivity, high
performance SiRF StarⅢ chipset solution in a compact design. The module tracks
up to 20 satellites at a time while offering fast time-to-first-fix and 1Hz navigation
update. The unit is very suitable for broad applications such as Handheld, PDA,
PPC or other battery operated navigation system.
Main Features
■ High sensitivity SiRF StarⅢ chipsets.
■ High performance receiver tracks up to 20 satellites.
■ TTL output for GPS command interface.
■ Low power consumption.
■ Average Cold Start time under 42 seconds.
■ On-chip 1Mb SRAM.
■ Reacquisition time 0.1 second.
■ Support accurate 1PPS output signal aligned with GPS timing.
■ Support Standard NMEA-0183 and SiRF Binary protocol.
■ Multi-path mitigation hardware.
■ Built-in a lithium battery enables fast positioning.
■ Compact size (25.4×25.4×7 mm
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) for easy integration into hand-held devices.
The SR-87 design utilizes the latest surface mount technology and high level circuit
integration to achieve superior performance while minimizing dimension and power
consumption. This hardware capability combined with software intelligence
makes the board easy to be integrated and used in all kinds of navigation
applications or products. The module communicates with application system via
RS232 (TTL level) with NMEA-0183 protocol.
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2. Technical Specifications
2.1. Electrical Characteristics
2.1.1 General
Frequency L1, 1575.42 MHz
C/A code 1.023 MHz chip rate
Channels 20 channels all in view tracking
2.1.2 Sensitivity
Tracking -159 dBm typical
2.1.3 Accuracy (Open Sky)
Position < 10 meters, 2D RMS
< 7 meters 2D RMS, WAAS corrected
1-5 meters, DGPS corrected
Time 1 microsecond synchronized to GPS time
2.1.4 Datum
Default WGS-84
2.1.5 Acquisition Rate
Hot start 1 sec, average
Warm start 38 sec, average
Cold start 42 sec, average
Reacquisition 0.1 sec, average
2.1.6 Dynamic Conditions
Altitude < 18,000 meters (60,000 feet)
Velocity < 515 meters/sec (1000 knots)
Acceleration < 4 G
Jerk 20 meters/sec max
2.1.7 Power
Main power input 3.0 ~ 5.5 VDC input.
Supply Current < 80 mA
Backup Power 3V rechargeable Lithium battery,
up to 500 hours discharge
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2.1.8 RF Interface
Antenna connector type MMCX
2.1.9 Serial Port
Electrical interface Two full duplex serial communication, via RS232,
TTL interface.
Protocol message NMEA-0183.
Default NMEA GGA, GSA, GSV, RMC, (GLL, VTG, and ZDA
optional).
4800 baud rate (other rate optional).
8 bits data, 1 stop bit, no parity.
2.1.10 Time 1PPS Pulse, Pulse duration 100 msec.
Time reference at the pulse positive edge.
Synchronized to GPS time, ±1 microsecond.
2.1.11 Weight < 8g
2.1.12 Recommended External Antenna Specification
Gain 20 dB min (cable loss included)
Noise figure 1.5 dB typical
Current 10 mA typical
Operating Voltage Confirmed to spec 3.3 ~ 5.5 V
Survival 3.0 ~ 3.3 V
2.2. Environmental Characteristics
Operating temperature range -40
o
C to +85
o
C
Storage temperature range -45
o
C to +100
o
C
