Coherent double homodyne optical backscatter filter

Details Coherent double homodyne optical backscatter filter Coherent double homodyne optical backscatter filter

1991-12-19

1993-11-16

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

G01C 308

Patent

active

052628361

ABSTRACT:
An optical backscatter filter (10) for use with continuous wave laser radar systems. The filter removes undesired frequency components corresponding to optical backscatter from a received input signal (12) to extract a desired return signal (32) associated with a target. The received signal (32) is processed optically, requiring only an electronic notch filter (24) and one electronic mixer (30) to finally extract the desired return signal (32).

REFERENCES:
patent: 4516583 (1985-05-01), Pearson
patent: 4537502 (1985-08-01), Miller et al.
patent: 4731587 (1988-03-01), Jensen
patent: 5070483 (1991-12-01), Berni
patent: 5082364 (1992-01-01), Russell

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