The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 08, 1980
Filed:
Jun. 12, 1978
Wladimir Koreicho, Chilly Mazarin, FR;
Societe Anonyme de Telecommunications, Paris, FR;
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.