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:
Nov. 18, 2003
Filed:
Nov. 24, 1997
Joseph D. Simone, Chelmsford, MA (US);
Edward A. Seghezzi, Londonderry, NH (US);
Raytheon Company, Lexington, MA (US);
Abstract
A radar system receiver having an antenna system adapted to receive a jammer signal from both a direct path and from an indirect path. The direct and indirect paths have both differential Doppler frequency and differential time delay induced phase shifts. The antenna system includes a plurality of antenna elements. A plurality of radar receiver sections, each one having a clutter filter, is provided. Each one of the receiver sections is fed by a corresponding one of the antenna elements. An adaptive jammer canceler is fed by the plurality of radar receiver sections for providing a beam forming network to suppress both the direct and indirect paths of the jamming signal. The adaptive canceler separates each of a plurality of radar dwells into a plurality of sub-intervals, determines frequency components in each of the sub-intervals over a predetermined frequency bandwidth, forms a plurality of frequency sub-band beam forming networks from the frequency components for each of a corresponding one of the sub-intervals to suppress the differential time delay phase shifts in the received jamming signal, and produces a composite output signal from the plurality of frequency sub-band beam forming networks and the plurality of subintervals to suppress the differential Doppler frequency induced phase shifts in the received jamming signal.