4000 & 5000 Series User’s Guide
2.3.4 GPS specifications (5000 series modems only)
General
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L1 frequency (1575.42 MHz)
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C/A code (Standard Positioning Service)
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12-channel
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Continuous tracking receiver
Update rate
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TSIP @ 1 Hz
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NMEA @ 1Hz
Accuracy
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Horizontal: <5 meters (50%), <8 meters (90%)
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Altitude: <10 meters (50%), <16 meters (90%)
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Velocity: 0.06 m/sec.
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PPS (static): ±50 nanoseconds
Acquisition
Autonomous Operation in Standard Sensitivity Mode:
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Reacquisition: <2 sec. (90%)
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Hot Start: <10 sec. (50%), <13 sec. (90%)
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Warm Start: <38 sec. (50%), <42 sec. (90%)
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Cold Start: <50 sec. (50%), <84 sec. (90%)
Cold Start requires no initialization.
Warm Start implies last position, time and almanac are saved by
backup power.
Hot start implies ephemeris also saved.
Optional (COCOM) limits:
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Altitude: 18,000 m
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Velocity: 515 m/s
Either limit may be exceeded, but not both.
Dynamics
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Acceleration: 4g (39.2 m/sec2)
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Motional jerk: 20 m/sec3
Revision 1.5
Copyright © 2007 BlueTree Wireless Data Inc. Page 13 of 67
