1 INTRODUCTION
The GDL 88 is a remotely mounted ADS-B transceiver. There are four models of the GDL 88(D). Models with a single bottom mounted UAT antenna meet TSO C154c Class A1S and are available with or without an internal GPS/SBAS receiver. Models with one top mounted and one bottom mounted antenna meet TSO C154c Class A1H and are also available with or without an internal GPS/SBAS receiver.
1.1GDL 88(D) System Functions
The GDL 88 performs the following functions:
•UAT transmission (978 MHz)
The GDL 88 transmits ADS-B Out data on the 978 MHz (UAT) frequency to be received by other aircraft, vehicles, and ATC for situational awareness and traffic management.
•UAT reception (ADS-B, ADS-R, TIS-B, and FIS-B) on 978 MHz
The GDL 88 receives ADS-B data transmitted on the UAT link from other aircraft, vehicles, and ground stations to present a traffic situational awareness display for use by the flight crew. In addition, the GDL 88 receives FIS-B data on the UAT link to provide the flight crew with graphical and textual weather products.
•Mode-S Extended Squitter reception on 1090 MHz
The GDL 88 receives ADS-B data transmitted by aircraft on the 1090 MHz link to provided a comprehensive situational awareness traffic display for use by the flight crew.
•Correlation of traffic reports from multiple traffic sources, including no heading source installations
The GDL 88 is capable of interfacing with TCAD/TAS/TCAS I systems to create and present a “fused” situational awareness display to the flight crew.
•Output of ADS-B and TAS/TCAS I traffic data to an external display
The GDL 88 is capable of providing a situational awareness traffic display on compatible displays.
•Output of FIS-B weather data to an external display
The GDL 88 is capable of providing various textual and graphical weather
