System Overview
190-01499-02
GTX 3X5 Transponder TSO Installation Manual
Rev. 9
Page 1-11
1.10 UAT Receiver Specifications (GTX 345 Only)
Table 1-9 UAT Receiver Specifications
1.11 1090 MHz Receiver Specifications
Table 1-10 1090 MHz Receiver Specifications
1.12 GPS Specifications (Units with Internal GPS Only)
Table 1-11 GPS Receiver Specifications
Characteristic
Specification
Frequency
978 MHz + 20 ppm
Modulation
Continuous phase FSK, h = 0.6, raised cosine shaping, a = 0.5
Data rate
1.04 Mbps
Sensitivity
-96 dBm for 90% MSR
Characteristic
Specification
Frequency
1090 MHz + 1 MHz
Modulation
Binary pulse-position
Data rate
1 Mbps
Sensitivity
-81 dBm for 90% MSR
Characteristic
Specification
Number of channels
15 (12 GPS and 3 GPS/SBAS)
Frequency
1575.42 MHz L1, C/A code
Sensitivity (acquisition, no interference)
-134.5 dBm GPS
-135.5 dBm SBAS
Sensitivity (drop lock)
-144 dBm
Dynamic range
>20 dB
LAT/LON position accuracy
<1.25 meter RMS horizontal, <2 meter vertical, with SBAS
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)
1PPS (Pulse Per Second)
± 275 nsec of UTC second
Datum
WGS-84
SATCOM compatibility
SATCOM compatibility is dependent on antenna selection
Antenna power supply
35 mA typical, 40 mA max at 4.7 VDC
