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赤外線捜索追跡
Wikipedia definition
1. Infra-red search and trackAn infra-red search and track (IRST) system (sometimes known as infra-red sighting and tracking) is a method for detecting and tracking objects which give off infrared radiation such as jet aircraft and helicopters. IRST is a generalized case of forward looking infrared (FLIR), i.e. from forward-looking to all-round situational awareness. Such systems are passive, meaning they do not give out any radiation of their own, unlike radar.
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Read “赤外線捜索追跡システム” on Japanese Wikipedia
Read “Infra-red search and track” on DBpedia

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