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STAP Method for Space Based Radar Based on Spectrum Registration with Non-Uniformed Frequency Samples |
Yu Wen-xian; Zhang Zeng-hui; Hu Wei-dong |
ATR Key Lab, National University of Defense Technology, Changsha 410073, China |
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Abstract Due to the earth’s rotation or non-sidelooking radar configuration, the spectrum of Space Based Radar (SBR) clutter varies with the range and shows non-stability. The non-stability of clutter will degrade Space Time Adaptive Processing (STAP) performance significantly and should be compensated. A new spectrum registration based method is proposed which uses non-uniformed discrete frequency sampling points. The mathematical model of the non-uniformed spectrum registration method is built. The choices of these non-uniformed discrete frequency samples and the estimate of clutter covariance matrix after compensation are also studied. Simulations show that the proposed spectrum registration method can compensate the non-stability effectively and achieve approximately optimal performance.
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Received: 26 July 2007
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