System Specification and Functionality
190-01810-00 GDL 82 TSO Installation Manual
Rev. 5 Page 2-3
Table 2-3 GPS/SBAS Specifications
Table 2-4 978 MHz UAT Specifications
[1] As measured at the ANT RF connector.
CHARACTERISTICS SPECIFICATIONS
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
LAT/LON position accuracy <1.25 meter RMS horizontal, <2 meter vertical, with SBAS
Velocity 1165 knots (600 meters/second) maximum
TTFF (Time To First Fix) 2:20 min. typical with current almanac and position
Reacquisition 10 seconds typical
Position update interval 0.2 sec (5 Hz)
Time mark ±275 Nsec of UTC second
Datum WGS-84
SATCOM compatibility Dependent upon antenna selection
Antenna power supply
35 mA typical, 40 mA max at 4.7 VDC +
0.1 VDC nominal,
minimum 4.3 VDC with 60 mA load
CHARACTERISTICS SPECIFICATIONS [1]
Frequency 978.00 MHz
Transmit power 40 W (+46 dBm)
Frequency tolerance +
20 PPM
Modulation
Continuous phase FSK, h = 0.6, raised cosine
shaping, a = 0.5
Data rate 1.04 Mbps
99% power bandwidth 1.3 MHz
60 dB bandwidth 3.3 MHz (estimated)
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