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GNS 400W Series Maintenance Manual
Page 2-5
190-00356-05
Rev. A
Table 2-3. GPS Specifications
Number Of Channels
15 (12 GPS and 3 GPS/WAAS/SBAS)
Frequency
1575.42 MHz L1, C/A code
Sensitivity (Acquisition, No Interference)
-134.5 dBm GPS -135.5 dBm WAAS
Sensitivity (Drop Lock)
-144 dBm
Dynamic Range
> 20 dB
Lat/Lon Position Accuracy
< 1.25 meter RMS horizontal, < 2 meter vertical, with
WAAS
Velocity
1000 knots maximum (above 60,000 ft.)
TTFF (Time To First Fix)
1:45 min. typical with current almanac, position, and
time
Reacquisition
10 seconds typical
Position Update Interval
0.2 sec (5 Hz)
1 PPS (Pulse Per Second)
± 275 nanoseconds of UTC second
Datum
WGS-84
SATCOM Compatibility
SATCOM compatibility is dependent upon antenna
selection.
Antenna Power Supply
35 mA typical, 40 mA max at 4.7 V dc