identification friend or foe

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identification friend or foe (IFF)

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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.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
This implies that HENSOLDT is the first company outside of the USA to fulfill this critical prerequisite for delivering IFF devices (IFF = Identification Friend or Foe) for the upcoming conversion of all NATO identification systems to the future 'Mode 5' standard without any discrepancies.
Hensoldt is the first company outside of the US to fulfil this critical prerequisite for delivering IFF (identification friend or foe) devices for the upcoming conversion of all NATO identification systems to the future "Mode 5" standard without any discrepancies, said a statement.
Telephonics Corporation, a wholly owned subsidiary of Griffon Corporation, announced that it has been awarded a $22.8M contract from Huneed Technologies for its AN/UPX-44 Identification Friend or Foe system.
AAMSI is an established leader in the global market for IFF (Identification Friend or Foe) systems.
If you need to duck under the tail boom, stay clear of the identification friend or foe (IFF) antenna.
Release date- 23052013 - BAE Systems' next-generation Identification Friend or Foe (IFF) system has passed a key Department of Defense (DoD) certification, making it available to improve navigation and identification capabilities on diverse military platforms.
Air Traffic Control Radar Beacon System Identification Friend or Foe Mark XII/XIIA System (AIMS) Program Office.
The Greding-based system provides encrypted interrogation to an aircraft's IFF (Identification Friend or Foe) system, which will provide precise data on the origin, course and speed of the aircraft interrogated and supplements the information supplied by primary radars.
Electronic toll collection (ETC), an adaptation of military "identification friend or foe" technology, aims to eliminate the delay on toll roads by collecting tolls electronically.
BC Systems introduced the BC-751, an 800 W AC/DC converter with eight outputs to provide power for solid-state RF amplifiers in airborne Identification Friend or Foe (IFF) applications.
DTRA's 49-day acquisition effort to develop and field the Rapid Identification Friend or Foe (RIFF) Test Kit was a remarkable accomplishment considering that the DTRA program manager had no formal requirements, no budget, no formal program office, and no assigned personnel.
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