Focusing-based approach for wide-band source localization in near-field

A wide-band near-field source localization method is presented in this paper. Based on a pre-estimated source location, we form a focusing matrix which is able to compensate the wavefront distortion (with respect to far-field wavefront) due to near-field propagation and frequency dependent phase shift simultaneously. The focused covariance matrix has been proved to have a partially far-field narrow band structure, which allows us to estimate the bearings of the sources by the well studied far-field DOA estimators. The range estimation is then carried out via peak searching of the 1D MUSIC spectral with the estimated bearings. The performance of the algorithm is tested by simulations.