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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0123466 (1980-02-21) |
우선권정보 | DE-2907249 (1979-02-26) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 16 인용 특허 : 6 |
A device for the detection of and defense against low-flying helicopters which are masked or hidden by ground cover has a heat-sensitive sensor and an optical filter to detect heat radiation which is modulated at a frequency corresponding to the frequency of rotation of the helicopter blades. The he
A system for detection of and defense against low-flying helicopters, having a drive means and rotary lifting blades operating at an angular frequency and disposed above said drive means, which are hidden by ground cover, said system comprising: a detector for detecting thermal radiation produced by
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