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)
