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. 19, 2011
Filed:
May. 27, 2009
Michael B. Uscinowicz, Hainesport, NJ (US);
Michael B. Uscinowicz, Hainesport, NJ (US);
Lockheed Martin Corporation, Bethesda, MD (US);
Abstract
A radar system with an array antenna includes various signal paths, including beamformers, extending between an exciter, a receiver, and the array antenna. The signal paths are calibrated by a method that includes frequency modulation of the exciter signals that reach the 'antenna' and additional amplitude modulation of signals just as they enter the receiver. Leakage paths directly from the exciter to the receiver are unmodulated, those extending from the exciter through the beamformer are amplitude modulated, and only those reaching the 'antenna' and returning to the receiver are both amplitude and frequency modulated. The receiver is tuned to receive only the “doubly-modulated” signals, which tends to reject leakage signals.