Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2006-12-26
2006-12-26
Tarcza, Thomas H. (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
C356S005150, C356S028000, C356S141100, C342S062000
Reexamination Certificate
active
07154590
ABSTRACT:
A method and apparatus for finding a relative direction to, a radial speed of, and a distance to a target is described. A laser source illuminates the target and the Doppler shifted return beam is incident upon a window system at an angle and is transmitted therethrough. The magnitude of the transmitted Doppler shifted beam decreases due to Fresnel transmittance. Opposing photomixers then detect this transmitted Doppler shifted beam, thereby creating a pair of detection signals that are mixed with a local oscillator signal. The mixing process creates Doppler frequency signals that are subsequently processed to determine the radial speed of the target. Due to the Doppler frequency component of the signals, objects in the same direction, but moving at different radial speeds, can be discriminated, as the relative direction processing occurs after the Doppler processing.
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Baker Brian C.
Turner Mark A.
Williams Brett A.
Alsomiri Isam
Lockheed Martin Corporation
Tarcza Thomas H.
Williams Morgan & Amerson P.C.
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