Device for suppressing very close interference echo signals in o

Details Device for suppressing very close interference echo signals in o Device for suppressing very close interference echo signals in o

1978-06-12

1980-07-08

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

343 172PC, G01C 308, G01S 728

Patent

active

042114853

ABSTRACT:
A device for suppressing the interference echo signals in an optical pulse compression radar comprising, at the transmitting side, a circuit for generating electrical signals of determined duration and with a frequency variable as a function of time, called chirps, an optical transmitter comprising a continuous transmission source modulated by the chirps and, at the receiving side, a receiver for deriving chirps from the light signals received and a processing circuit for the chirps supplied by the receiver, comprising a first mixer receiving from said receiver the reception chirp and from said circuit the transmission chirp and then, when the latter is ended, a relay signal of a determined frequency, said first mixer delivering a signal of a frequency equal to the difference of the frequencies of the input signals, a filter for filtering out the interference component of the output signal from the first mixer, and a second mixer receiving, on the one hand, the signal thus filtered and, on the other hand, the transmission chirp and then said relay signal, and delivering to said processing circuit a signal of a frequency equal to the difference of the frequencies of the input signals.

REFERENCES:
patent: 3493969 (1970-02-01), Bonnaval et al.
patent: 3647298 (1972-03-01), Soules
patent: 3825340 (1974-07-01), Debart
patent: 3841755 (1974-10-01), Debart
patent: 3875571 (1975-04-01), Davis, Jr. et al.
patent: 4003053 (1977-01-01), Mengel

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