identification friend or foe

A secondary radar to identify whether the aircraft, or any other vehicle being interrogated, is friendly or hostile. The interrogator sends a radio signal on a predetermined frequency, which is received by the aircraft. It replies in code, giving the requisite information. It normally operates in conjunction with the primary radar. An IFF normally has four modes. Mode 1 is used for ground identification; the interrogation consists of a pair of pulses, and the reply is a single pulse. Mode 2 is detailed identification for a specific aircraft; the ground query consists of a pair of pulses, as does the reply. Mode 3 is used to specify the functional class of aircraft and has a direct ATC (air traffic control) function when used in conjunction with the selective identification feature. The pulse pattern is the same as Mode 1, but the interval between the pulse pair is longer. To indicate a distress condition, an emergency mode of interrogation can be used, which replies to any mode of interrogation by a sequence of pulses indicating an emergency to the ground station. Similar to the aeronautical transponder (SSR–secondary surveillance radar) system.

Aviation dictionary. 2014.

Look at other dictionaries:

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  • Identification friend or foe — Système de test IFF utilisé pour contrôler le transpondeur sur les avions …   Wikipédia en Français

  • Identification friend or foe — An IFF Test Set used for testing transponders on aircraft …   Wikipedia

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  • Identification Friend or Foe — Eine Freund Feind Erkennung (engl. identification friend or foe (IFF)) ist ein elektronisches System, das die Identifizierung eines erkannten Objekts ermöglicht. Meist wird es bei militärischen Radar Systemen eingesetzt, um feindliche… …   Deutsch Wikipedia

  • Identification Friend or Foe — IFF, (in Airplanes) electronic device that transmits a 4 digit identification code to the scanning surface radar in order to identify itself as friendly aircraft …   English contemporary dictionary

  • identification, friend or foe — A device that emits a signal positively identifying it as a friendly. Also called IFF. See also air defense …   Military dictionary

  • identification friend or foe — noun a) (in a civilian aircraft) a transponder that responds by sending a code identifying itself b) (in a military aircraft) a transponder that responds by sending a similarly coded signal, only when detecting a code indicating the radar is part …   Wiktionary

  • identification, friend or foe/selective identification feature procedures — The directives that govern the use of identification, friend or foe selective identification feature equipment. See also identification, friend or foe …   Military dictionary

  • identification friend or foe personal identifier — The discrete identification friend or foe code assigned to a particular aircraft, ship, or other vehicle for identification by electronic means …   Military dictionary

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