A high resolution method of source localization in near-field by using focusing technique

In this paper, we present a new high resolution algorithm to localize multiple sources in near-field. After focusing on a pre-estimated location, the covariance matrix of the received signal is found to have the same structure as in the far-field situation, which allows the estimation of bearing with far-field subspace methods. With the estimated bearing, the range estimation of each source is consequently obtained by using 1-D MUSIC method without parameter pairing. This algorithm does not require a high cost 2-D search or high-order statistics, and has high-resolution performance in contrast with other fast near-field approaches. Monte Carlo simulations are used to test the performances of this approach.