DOA estimation based on data level Multistage Nested Wiener Filter

A novel direction of arrival (DOA) estimation method based on data level Multistage Nested Wiener Filters (MSNWF) which is used to adaptive beamforming for subarray signal is proposed in this paper. The subarrays using the same array geometry are used to form a signal whose phase relative to the reference signal is a function of the DOA. The DOA is estimated by computing the phase shift between the reference signal and its phase-shifted version. The performance of this DOA estimation method is significantly improved due to the application of MSNWF for rejecting interference signals. The computation of the proposed method is simple, and the number of detectable signal sources can exceed the number of antenna elements.