distance measuring equipment (DME)

distance measuring equipment (DME)

A pulse-type electronic navigation system that shows the pilot, by an instrument-panel indication, the number of nautical miles between the aircraft and a ground station.

The DME transmitter in the aircraft transmits a specific pulse of electrical energy. This pulse is received by the ground station and retransmitted on another frequency. When the pulse is received back in the aircraft, the time used for its travel to the ground station and back is converted into terms of nautical miles to the station. DME is a portion of the military TACAN (Tactical Air Navigation) system.

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