Raytheon Company

Hughes Aircraft Company

Douglas G DeWolf

Howard S Nussbaum

Oleg Brovko

Ben B Varga

An adaptive signal processor (100) utilized with a receiving system (10) in a non-stationary environment having a receiver element (12) for receiving a composite signal comprised of a desire input signal and an interference signal. The invention includes a first mechanism (102) for modulating the composite signal to provide a plurality of modulated signals and to generate a plurality of synthetic channels (104). A second mechanism (126) is provided for calculating and applying a plurality of adaptive weight values to the modulated signals in the synthetic channels (104) to provide a plurality of time varying weighted signals. Finally, a third mechanism (128) is provided for combining the time varying weighted signals in the synthetic channels (104) to eliminate the interference signal from the composite signal. In a preferred embodiment, the composite signal is received by an antenna or hydrophone (12) and then digitized and stored in a memory (122). Stored digitized data is then modulated to provide modulated signals and a plurality of synthetic channels (104). Samples of the modulated signals are used as a basis to generate a plurality of adaptive weight values which are applied to the modulated signals to provide time varying weighted signals for tracking the non-stationary environment. The weighted signals are then summed to eliminate the interference signal from the composite signal.

Adaptive signal processor for non-stationary environments and method

A process for cancelling the effects of noise jamming in a radar system having a dual-polarization monopulse antenna, a computer processor, and target detection algorithms, wherein the noise jamming produced by a hostile electronic countermeasure on a target is cancelled so as to detect the target in the optimum detection channel. The process consists of the steps of receiving signals from multiple monopulse polarization aperture combinations of the radar antenna, sampling the signals from the radar antenna, digitizing the sampled signals, calculating combination values based upon the samples of the digitized signals, computing several potential target detection channel signals based upon the combination values and samples of the digitized signals, applying the detection channel signals to the computer processor and selecting the optimum detection channel signal for detection of the target using the computer processing whereby the signal is then applied to target detection algorithm of the radar processor.

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Los Angeles, CA, United States of America

Douglas G DeWolf