Garmin International Inc 01246 Manuel D’Utilisation

GDL 88 TSO Installation Manual

Page 1-3

190-01122-00

Rev. A

1.3.3 GPS/SBAS Specifications

Table 1-4. GPS/SBAS Specifications – GDL 88 and GDL 88D with GPS/SBAS

Characteristics

Specifications

Number Of Channels

15 (12 GPS and 3 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 Nsec 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 VDC

1.3.4 978 MHz UAT Transceiver Specifications

Table 1-5. UAT Transceiver Specifications

Characteristics

Specifications

Frequency

978.00 MHz

Transmit Power

50 W (+47 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)

Receiver Sensitivity

-96 dBm for 90% MSR