Raytheon Company

Edward A Seghezzi

Joseph D Simone

Barbara E Pauplis

W Timothy Carey

An adaptive antenna array has array elements arranged in element rows and element columns and subarrays arranged in subarray rows and subarray columns, for which the subarray phase centers have non-uniform spacing. The adaptive antenna array provides good detection and tracking performance when used in a radar system, while being inexpensive and easy to manufacture. A radar system and a method of adapting a radar array both employ the above described adaptive antenna array.

Adaptive array

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.

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Londonderry, NH, United States of America

Edward A Seghezzi