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SR-87 GPS Engine board


The ProGin SR-87 series GPS module incorporates high sensitivity, low power consumption SiRF Starˇé¨® chipset solution in a compact design. The module will track up to 20 satellites at the time while offering fast time-to-first-fix, 1Hz navigation update. The unit is very suitable for broad applications such as Handheld, PDA, PPC or other battery operated navigation system.


?? High sensitivity SiRF Starˇé¨® chipset.
?? 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.
?? A Built-in Lithium battery enables fast positioning.
?? Compact size (25.4?¨˘25.4?¨˘7 mm3) for easy integration into hand-held devices.

*Ordering information:
SR-87V, Vertical MMCX input
SR-87H, Horizontal MMCX input

*Technical Specifications
Electrical Characteristics
Frequency L1, 1575.42 MHz
C/A code 1.023 MHz chip rate
Channels 20 channels all in view tracking

Tracking -159 dBm typical
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
Default WGS-84

Acquisition Rate
Hot start 1 sec, average
Warm start 38 sec, average
Cold start 42 sec, average
Reacquisition 0.1 sec, average
Dynamic Conditions
Altitude < 18,000 meters (60,000 feet)
Velocity < 515 meters/sec (1000 knots)
Acceleration < 4 G
Jerk 20 meters/sec max
Main power input 3.0 ~ 5.5 VDC input.
Supply Current < 80 mA
Backup Power 3V rechargeable Lithium battery,
up to 500 hours discharge

RF Interface
Antenna connector type MMCX

Serial Port
Electrical interface Two full duplex serial communication, via RS232, TTL interface
Protocol message NMEA-0183, SiRF Binary
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.
Time 1 PPS Pulse, pulse duration 100 msec.
Time reference at the pulse positive edge.
Synchronized to GPS time, ?¨¤1 microsecond.

Weight < 8g

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

Environmental Characteristics
Operating temperature range -40 oC to +85 oC
Storage temperature range -45 oC to +100 oC

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