Target-aerosol discrimination by means of digital signal process

Details Target-aerosol discrimination by means of digital signal process Target-aerosol discrimination by means of digital signal process

1991-08-15

1992-04-07

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

G01C 308

Patent

active

051022184

ABSTRACT:
For all-weather active optical proximity sensors, the technique extracts a proper target signal from the mixture of target and aerosol returns. A waveform extraction method and a spectral extraction technique are used. The waveform extraction method examines the changes of the mixed signals in the time domain by using derivatives and other pertinent parameters. The spectral extraction method extracts the target signature by bandpass filtering the transform coefficients after taking orthogonal transformations of the mixed data. Using the former, a portion of a data set is segmented to include target and aerosol returns only. The latter method is applied to the segmented portion.
An outline of the method is stated in the following.

REFERENCES:
patent: 4397549 (1983-08-01), Morgan
patent: 4742353 (1988-05-01), D'Addio et al.
patent: 4881077 (1989-11-01), Jehle et al.
patent: 4884440 (1989-12-01), Berthel
patent: 4920412 (1990-04-01), Gerdt et al.
patent: 4937583 (1990-06-01), Poinsard

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