Identification friend or foe

An IFF test set used for testing transponders on aircraft

Model XAE IFF kit, the first radio recognition IFF system in the U.S.

Radar coverage of the Chain Home system by 1939

Code generator from German WW II IFF-Radio FuG 25a Erstling

Identification, friend or foe (IFF) is an identification system designed for command and control. It enables military and national (civilian air traffic control) interrogation systems to identify aircraft, vehicles or forces as friendly and to determine their bearing and range from the interrogator. IFF may be used by both military and civilian aircraft.

单词	Selective Identification Feature
释义	Selective Identification Feature 英语百科 Identification friend or foe Identification, friend or foe (IFF) is an identification system designed for command and control. It enables military and national (civilian air traffic control) interrogation systems to identify aircraft, vehicles or forces as friendly and to determine their bearing and range from the interrogator. IFF may be used by both military and civilian aircraft.
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Selective Identification Feature

Identification friend or foe