Robust sidelobe canceller against DOA mismatch

The sidelobe canceller (SLC) is widely used for the array processing to suppress interferences located in the sidelobe of the radiation pattern. In the presence of steering vector mismatch, the performance of SLC may suffer from severe degradation due to desired components cancellation. In this paper, a modified approach is developed to improve the robustness against the direction of arrival (DOA) mismatch. The principle is to exclude the desired signal from auxiliary channels based on effective estimation of the steering vector. By expressing it as a linear combination of the basic vectors of a properly chosen orthogonal matrix, the steering vector is forced not to converge to any of interferences. Numerical simulations demonstrate the superiority of the modified method over the traditional SLC techniques.