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1.3.3 GPS/SBAS Specifications
Table 1-4. GPS/SBAS Specifications – GDL 88 and GDL 88D with GPS/SBAS
Characteristics
Number Of Channels
Frequency
Sensitivity
(Acquisition, No Interference)
Sensitivity (Drop Lock)
Dynamic Range
Lat/Lon Position Accuracy
Velocity
TTFF (Time To First Fix)
Reacquisition
Position Update Interval
1 PPS (Pulse Per Second)
Datum
SATCOM Compatibility
Antenna Power Supply
1.3.4 978 MHz UAT Transceiver Specifications
Characteristics
Frequency
Transmit Power
Frequency Tolerance
Modulation
Data Rate
99% Power Bandwidth
60 dB Bandwidth
Receiver Sensitivity
GDL 88 TSO Installation Manual
190-01122-00
15 (12 GPS and 3 SBAS)
1575.42 MHz L1, C/A code
-134.5 dBm GPS
-135.5 dBm WAAS
-144 dBm
> 20 dB
<1.25 meter RMS horizontal, <2 meter vertical, with WAAS
1000 knots maximum (above 60,000 ft)
1:45 min. typical with current almanac, position, and time
10 seconds typical
0.2 sec (5 Hz)
275 Nsec of UTC second
WGS-84
SATCOM compatibility is dependent upon antenna selection.
35 mA typical, 40 mA max at 4.7 VDC
Table 1-5. UAT Transceiver Specifications
978.00 MHz
50 W (+47 dBm)
+ 20 PPM
Continuous Phase FSK, h = 0.6, Raised Cosine shaping, a = 0.5
1.04 Mbps
1.3 MHz
3.3 MHz (estimated)
-96 dBm for 90% MSR
Specifications
Specifications
Page 1-3
Rev. A