Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1996-07-31
1998-05-05
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 285, G01C 308, G01P 336
Patent
active
057482950
ABSTRACT:
The present invention provides a range finding system which utilizes feedback to induce mode hopping in a standing wave generator and which determines the range, direction and velocity of an object with respect to the range finding system based on the mode hop rate. The present invention provides a novel sampling technique which prevents aliasing by modulating the standing wave generator at a frequency equal to or greater than .pi. times the frequency at which the optical path between the object and the standing wave generator is oscillating or vibrating. In order to account for Doppler effect, the standing wave interference coupling is analyzed over one period of the frequency modulation rate of the standing wave generator. A spectral analysis algorithm is implemented which determines the mode hop rate of the standing wave generator and the range, direction and velocity of the object with respect to the range finding system based on the determined mode hop rate. Implementation of the spectral analysis algorithm improves signal-to-noise ratio by avoiding thresholding to provide a range finding system which is substantially amplitude independent.
REFERENCES:
patent: 3733129 (1973-05-01), Bridges
patent: 5069545 (1991-12-01), Hinz
patent: 5267016 (1993-11-01), Meinzer et al.
patent: 5594543 (1997-01-01), de Groot et al.
Hellner Mark
University of Georgia Research Foundation
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