In the presence of the direction of arrival (DOA) mismatch, the performance of generalized sidelobe canceller (GSC)\nmay suffer severe degradation due to the gain loss of the desired signal in the main array and cancellation. In this\npaper, one effective GSC algorithm is proposed to improve the robustness against the DOA mismatch of the desired\nsignal. Firstly, two subspaces, which contain the desired signal�s actual steering vectors of the main and auxiliary arrays,\ncan be obtained by using the range information of the angle which the desired signal may come from. By rotating\nthese two subspaces, the desired signal�s actual steering vectors of the main and auxiliary arrays can be estimated\nbased on the maximum output power criterion. Then, with the estimates of the steering vectors in the former step, the\ngain loss of the desired signal in the main array can be alleviated. Moreover, one adaptive weight vector with the\nability to block the desired signal in the auxiliary array can be obtained simultaneously, which effectively avoids the\nsignal of interest cancellation consequently. Cycle iterative approach is also applied to guarantee the estimation\naccuracy of a wide range of angle deviation. Numerical simulations demonstrate the effectiveness and applicability of\nthe proposed method.
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