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Airborne interception radar
Airborne interception radar, or AI, was the Royal Air Force (RAF) term for radar systems used to equip aircraft in the air-to-air role. These radars are used primarily by RAF and Fleet Air Arm night fighters and interceptors for locating and tracking other aircraft, although most AI radars could also be used in a number of secondary roles as well. The term was sometimes used generically for similar radars used in other countries as well.
The term was first used circa 1936, when a group at the Bawdsey Manor research center began considering how to fit a radar system into an aircraft. This work led to the Airborne Intercept radar Mk. IV, the first production air-to-air radar system. Mk. IV entered service in July 1940 and reached widespread availability on the Bristol Beaufighter by early 1941. The Mk. IV helped end the Blitz, the ''Luftwaffes night bombing campaign of late 1940 and early 1941.
Starting with the AI Mk. VII, AI moved to microwave frequencies using the cavity magnetron, greatly improving performance while reducing size and weight. This gave the UK an enormous lead over their counterparts in the ''Luftwaffe'', one that was never addressed during World War II. By the end of the war, over a dozen AI models had been experimented with, and at least five units widely used in operation. This included several US-built models, especially for the Fleet Air Arm.
The AI naming convention was used in the post-war era as well, but these generally dropped the "Mk." when written in short form and used numbers instead of Roman numerals. A good example is the AI.24 radar of the Tornado F.2. These radars were often given common names as well, and generally better known by these; the AI.24 is almost universally referred to as Foxhunter. Other widely used post-war examples include the AI.18 used on the de Havilland Sea Vixen, and the AI.23 Airpass on the English Electric Lightning. This article will use Mk. or AI. depending on which is most commonly used in available references.
==Development history==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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