VELOCITY MEASUREMENT

Abstract

Apparatus for measuring the velocity of, for example, an aircraft includes two optical units spaced a predetermined distance apart along an axis, there being a plurality of pairs of associated radiation detectors, with each pair of detectors having one detector in each unit, the planes of lines of sight of each pair of detectors extending parallel to each other, with these planes of different pairs of detectors being inclined relative to each other, in a measurement period, comparing means of the apparatus determining the delay between the forward and aft detectors of at least one pair of detectors receiving radiation from the same part of the same portion of the plane of a radiation source, such as the terrain, and from this determination the velocity being represented, the comparing means possibly comprising a known form of correlator, possibly provided by a digital computer, the computer possibly also providing axis transformation means within the apparatus.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1JOHN C. PARKER

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