Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1986-11-03
1989-07-11
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 45, 356 285, G01C 308, G01P 336
Patent
active
048465712
ABSTRACT:
A laser is provided for generating a beam of continuous wave (CW) electromagnetic energy having a nominal frequency and amplitude. The frequency of the CW beam is modulated (FM) from the nominal frequency. The amplitude of the frequency modulated beam is modulated (AM) from the nominal amplitude to produce an amplitude and frequency modulated continuous wave (AM-FM CW) beam of energy. A local oscillator beam is produced from the frequency modulated CW beam. The AM-FM CW beam is directed for reflection by a target. The target-reflected return portions of the AM-FM CW beam are combined with the frequency modulated local oscillator beam to produce a beat frequency signal which is subsequently detected, the beat frequency signal having a frequency component representative of the range of the target. Such arrangement, when implemented in a radar system, provides such radar system with accurate target range measurements unambiguous over large ranges. Further, such AM-FM CW signal provides high resolution between target-reflected return signals of such AM-FM CW signal and returns from near-field atmospheric clutter.
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CO.sub.2 Laser Radar Flight Test Results, C. Sonnenschein, R. Seavey, A. Chabot, Nov. 1-3, 1983.
Freedman Nathan
Jelalian Albert V.
Keene Wayne H.
Buczinski Stephen C.
Maginniss Christopher L.
Raytheon Company
Sharkansky Richard M.
Wallace Linda J.
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