Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1984-03-26
1988-05-10
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 285, 356 28, G01C 308, G01P 336
Patent
active
047431105
ABSTRACT:
Laser telemetry and Doppler measurement apparatus using pulse compression has a transmitter for providing a periodic pulsed transmission laser wave having a pair of pulses, one pulse being frequency modulated on one side of a main frequency F.sub.E, and the other pulse being frequency modulated on the other side of the main frequency F.sub.E. The transmitter also provides a reference laser wave having a frequency F.sub.L. A photomixer is adapted for superheterodyne reception of the reference laser wave and a return laser signal which has been reflected from a target. The return laser signal has a Doppler shift frequency F.sub.D. The photomixer provides a beat signal having a frequency F.sub.I plus F.sub.D, where F.sub.I is an intermediate frequency. A Doppler aquisition loop transposes the beat signal frequency and provides a transposed signal to compensate for the Doppler shift. The Doppler acquisition loop provides a coarse compensation signal having a frequency near the frequency F.sub.D. Under target tracking conditions, the Doppler acquisition loop then provides an automatic fine compensation signal which compensates for the Doppler difference .DELTA.F.sub.D which exists between the compensation signal frequency and the Doppler shift frequency. Receiving and processing means then receive the transposed signal and provide an output signal indicative of the distance to the tracked target and the Doppler shift frequency of the target.
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Hoge, "Integrated Laser/Radar Satellite Ranging & Tracking System," Applied Optics, 10/74, pp. 2352-2357.
Arnaud Georges
Meyzonnette Jean L.
Remy Bertrand
Robin Leon P.
Buczinski Stephen C.
Koltak Melissa
Thomson - CSF
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