User`s guide

4000 & 5000 Series User’s Guide

2.3.4 GPS specifications (5000 series modems only)

General

• L1 frequency (1575.42 MHz)

• C/A code (Standard Positioning Service)

• 12-channel

• Continuous tracking receiver

Update rate

• TSIP @ 1 Hz

• NMEA @ 1Hz

Accuracy

• Horizontal: <5 meters (50%), <8 meters (90%)

• Altitude: <10 meters (50%), <16 meters (90%)

• Velocity: 0.06 m/sec.

• PPS (static): ±50 nanoseconds

Acquisition

Autonomous Operation in Standard Sensitivity Mode:

• Reacquisition: <2 sec. (90%)

• Hot Start: <10 sec. (50%), <13 sec. (90%)

• Warm Start: <38 sec. (50%), <42 sec. (90%)

• 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:

• Altitude: 18,000 m

• Velocity: 515 m/s

Either limit may be exceeded, but not both.

Dynamics

• Acceleration: 4g (39.2 m/sec2)

• Motional jerk: 20 m/sec3