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US4245890A Gradient index of refraction for missile seekers 失效
导弹追踪者的渐变折射率

Gradient index of refraction for missile seekers
Abstract:
A missile having a sensor in the nose thereof. The nose is in the shape of transparent ogive window which has an index of refraction that assumes different values at different positions on the window whereas the window appears to the sensor as if it were a hemispherical window.
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