Nov 20, 2018
Identification Friend-or-Foe (IFF) is a secure aircraft identification system that detects and tells us the difference between the friendly and hostile aircrafts. These systems use electromagnetic and RF devices to communicate with the aircrafts and identifying friendly, foe or neutral forces in airspace. It is central to military operations as it allows armed forces to recognize friends and identify potential hostiles. The equipment acts as a sophisticated digital version of a ‘challenge and response’ password system, sending out a challenge signal and checking it receives a correct password.
An IFF system is a is a two-channel system, using the 1030 MHz band for interrogating signals and the 1090 MHz band for response signals. This can be divided into four modes, two for military use and two for both military and civilian aircrafts:
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