Height finder

Ground device to measure aircraft altitude / From Wikipedia, the free encyclopedia

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A height finder is a ground-based aircraft altitude measuring device. Early height finders were optical range finder devices combined with simple mechanical computers, while later systems migrated to radar devices. The unique vertical oscillating motion of height finder radars led to them also being known as nodding radar. Devices combining both optics and radar were deployed by the U.S. Military.[1]

Mill Valley AFS height finder AN/FPS-6 using fan-beam antenna (1973).

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