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Identification, friend or foe ( IFF) is a combat identification system designed for command and control. It uses a transponder that listens for an interrogation signal and then sends a response that identifies the broadcaster. IFF systems usually use radar frequencies, but other electromagnetic frequencies, radio or infrared, may be used. [1] It enables military and civilian air traffic ...
The reply format is usually referred to as a "code" from a transponder, which is used to determine detailed information from a suitably equipped aircraft. In its simplest form, a "Mode" or interrogation type is generally determined by pulse spacing between two or more interrogation pulses. Various modes exist from Mode 1 to 5 for military use ...
Mode 4 is used by military aircraft for the Identification Friend or Foe (IFF) system. Mode S is a discrete selective interrogation, rather than a general broadcast, that facilitates TCAS for civilian aircraft.
IFF Mark X was the NATO standard military identification friend or foe transponder system from the early 1950s until it was slowly replaced by the IFF Mark XII in the 1970s. It was also adopted by ICAO, with some modifications, as the civilian air traffic control (ATC) secondary radar (SSR) transponder. The X in the name does not mean "tenth", but "eXperimental". [1] Later IFF models acted as ...
A transponder (short for trans mitter-res ponder [1] and sometimes abbreviated to XPDR, [2] XPNDR, [3] TPDR [4] or TP [5]) is an electronic device that produces a response when it receives a radio-frequency interrogation. Aircraft have transponders to assist in identifying them on air traffic control radar. Collision avoidance systems have been ...
IFF Mark II. The IFF Mark II antenna on this Spitfire can just be made out, stretching across the rear fuselage from the roundel to the tip of the horizontal stabiliser. IFF Mark II was the first operational identification friend or foe system. It was developed by the Royal Air Force just before the start of World War II.
Temporarily turn on pre-briefed identification, friend or foe (IFF) mode or system. Float Directive/informative call to expand the formation laterally within visual limits to maintain a radar contact or prepare for a defensive response. Fox (number) Simulated/actual launch of air-to-air weapons.
Tel-Instrument Announces DoD AIMS Program Office Certification on the TS-4530A Mode 5 IFF Flight-Line Test Set Production Contracts Now In Place to Fully Satisfy the Mode 5 Testing Requirements of ...