Extending MUSIC algorithm by using virtual array technique

In array signal processing, one is often interested in simultaneously estimating the directions and frequencies of uncorrelated narrow-band radiating sources having different center frequencies. We present a new high-resolution signal estimation algorithm which can estimate the spatial direction θ_i and temporal frequency f_i of each source by using the virtual time-and-space array technique with MUSIC algorithm. The virtual linear array consists of one spatial subarray and one virtual temporal subarray and the parameter pair (θ_i, f_i) of each source can be easily obtained and automatically coupled. The proposed approach is simple and direct. Simulation results are presented to demonstrate the performance of the proposed technique