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Gun Laying radar, Mark I, or GL Mk. I for short, was an early radar system developed by the British Army to provide range information to associated anti-aircraft artillery. There were two upgrades to the same basic system, GL/EF (Elevation Finder) and GL Mk. II, which added the ability to accurately determine bearing and elevation. The first GL set was a crude design developed during the 1930s. Based on Chain Home, GL used separate transmitters and receivers located in wooden cabins mounted on gun carriages, each with its own large antenna that had to be rotated to point at the target. The antenna produced a signal that was semi-directional and was only capable of providing accurate slant range information; it could not locate a target better than about 20 degrees in bearing, and did not provide elevation information at all. A number were deployed with the British Expeditionary Force and at least one was captured by German forces during the Dunkirk evacuation. Their evaluation led them to hold a low opinion of British radar systems. Plans to introduce the Mk. II with accurate bearing and elevation were underway from the start, but these would not be available until 1940. An expedient solution was the GL/EF attachment, providing bearing and elevation measurements accurate to about a degree. With these improvements, the number of rounds needed to destroy an aircraft fell to 4,100, a ten-fold improvement over early-war results. About 410 of the Mk. I and slightly modified Mk. I * units had been produced when production moved to the Mk. II, which had enough accuracy to directly guide the guns. Higher accuracy and simpler operation lowered the rounds-per-kill to only 2,750 with Mk. II. After the invasion of the Soviet Union in 1941, about 200 Mk. II units were supplied to the Soviets who used them under the name SON-2. 1,679 Mk. II's were ultimately produced. The introduction of the cavity magnetron in 1940 led to a new design effort using highly-directional parabolic antennas to allow both ranging and accurate bearing measurements while being much more compact. These GL Mk. III radar units were produced in the UK as the Mk. IIIB (for British), and a locally designed model from Canada as the Mk. IIIC. Both were generally replaced starting in 1944 by the superior SCR-584. ==Development== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GL Mk. I radar」の詳細全文を読む スポンサード リンク
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