Peak-to-peak search: fast and accurate DOA estimation method for arbitrary non-uniform linear array

A peak-to-peak (P-to-P) search-based single source direction of arrival estimation is proposed. The P-to-P method aims to search only at each local minima of a least square cost function, thus quickly acquiring the global optimal solution relative to exhaustive grid search. Performance comparisons with existing methods verify that the proposed method achieves high accuracy, possesses low signal-to-noise ratio threshold and computational cost and can be applicable to any non-uniform linear array.