Underdetermined Direction-of-Arrival Estimation for Wideband Signals Based on SsF Scheme

Aiming at estimating the direction-of-arrival (DOA) of wideband signals under the underdetermined scenarios, a new method, named as synthesizing and self-focussing (SsF) scheme, is proposed. The contributions are tow-fold. Base on the theory of difference co-array, a new linear array geometry is designed to strengthen the degree-of-freedom (DOF); and based on the subspace theory, a new self-focusing strategy without requiring the information of initial DOA is proposed for fusing the array data of different frequency bins. Compared with other traditional methods by numerical simulations, the effectiveness and superiority of the proposed one can distinguish more wideband signals, and simultaneously can attain higher accuracy of DOA estimation.