Transponder (XPDR)
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Definition
An electronic device on an aircraft that transmits identification and altitude data to radar
Related Terms
Automatic Dependent Surveillance-Broadcast (ADS-B)
A surveillance technology where aircraft broadcast GPS position and other data
Avionics
The electronic systems used in aircraft including navigation, communication, and flight management
Radar
Radio detection and ranging technology used to track aircraft positions and weather
Squawk Code
A four-digit octal number assigned by ATC and set on the aircraft transponder
Traffic Collision Avoidance System (TCAS)
An airborne system that detects other transponder-equipped aircraft and provides resolution advisories