dbo:abstract
- 965型レーダー（英語: Type 965 radar）は、イギリスで開発された2次元レーダー。開発は朝鮮戦争中に行われており、フリゲート向けとしては1955年より導入された。 (ja)
- The Type 965 radar was VHF (P band) long-range aircraft warning radar used by warships of the Royal Navy from the 1960s onwards. The Type 965M, Type 965P, Type 965Q and Type 965R were improved versions; the Type 960, 965M and 965Q used the single bedstead AKE(1) aerial, whilst the Type 965P and 965R used the double bedstead AKE(2) aerial. The 965 is ultimately designed to a May 1950 requirement for a further updated version of the 1945 . The 960 provided long-range early warning on small ships, but had a very wide beam at 35° horizontal. In 1954 the idea of a general-purpose frigate with the ability to provide some fighter direction arose, which required a radar with a much narrower beam. Marconi responded with the 965, reducing the beam to 12°. Based on WWII technology, the 965 was subject to considerable radar clutter from waves. The Type 965Q and 965R were improvements on the 965M and 965P respectively, adding a COHO-based moving target indication (MTI) mode to suppress clutter. Designed before the introduction of Doppler filtering, it was not able to detect low-level targets against a background, either landforms or high waves. The lack of a true MTI proved to be a serious problem during the 1982 Falklands War, which ultimately led to the loss of HMS Coventry where Argentine aircraft could not be seen against the background of the islands. Similarly, the Type 965 could not detect aircraft flying low; the two Argentine Navy Super Étendards that caused the loss of HMS Sheffield were not detected by Type 965R radar when they were flying at 98 feet (30 m), but were shown as contacts by HMS Glasgow's Type 965R radar when they popped up to 120 feet (37 m) above sea-level at 45 nautical miles (83 km), though it was the UAA1 radar warning receiver that drew attention to the contacts. The Type 965 radars used radio frequencies that were used by television stations, and therefore caused interference with television (and vice versa) if used near land in Europe. Type 965 was superseded by the Type 1022 radar, which did not have this disadvantage. (en)
- 965型（Type 965）雷達是英國馬可尼公司為皇家海軍生產的一種遠程對空搜索雷達，自1955年開始成為皇家海軍巡防艦上的裝備，也是皇家海軍在1960年代艦艇上的標準搜索雷達。 (zh)