Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1995-04-19
1997-03-04
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
342128, 342159, 356 512, 356 513, G01C 308, G01S 1308
Patent
active
056085141
ABSTRACT:
In a high range resolution ladar, a chirp signal waveform is propagated as a divergent laser light waveform and the target reflected return is collected and converted to a current proportional to power. An undelayed chirp signal is added in a mixer to the return current and then low pass filtered to recover a mixed intermediate frequency (IF) signal having a frequency proportional to the target range. Periodically, the light circuit is interrupted and the chirp signal is processed through the mixer and low pass filter without a target return current and this output, the mixer self-clutter, is stored. This stored self-clutter signal is subsequently subtracted from the mixed IF signal on a chirp by chirp basis to cancel the self-clutter produced by the mixer. The subtracted signal is then frequency analyzed to determine target range.
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Ruff William C.
Stann Barry L.
Sztankay Zoltan G.
Buczinski Stephen C.
Dynda Frank J.
Krosnick Freda L.
The United States of America as represented by the Secretary of
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