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identification, friend or foe (IFF)
An electronic identification system that is the forerunner of the modern radar beacon transponder used by air traffic controllers to identify specific aircraft. IFF, developed in the latter part of World War II, is an electronic pulse system in which interrogation pulses of electrical energy are transmitted from a ground station and received in the aircraft.
If the airborne equipment is set to respond with the proper code, the IFF identifies the aircraft as friendly. But if the equipment does not reply with the correct code, the ground station is alerted to the fact that the indications received on its radarscope may be caused by a foe, or enemy. The principles of IFF equipment apply to other pulse navigation systems, especially aircraft radar beacon transponders and distance measuring equipment (DME).
- Part of Speech: noun
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- Industry/Domain: Aviation
- Category: Aeronautics
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