Multiple source direction finding: A signal enhancement approach

In this paper, several methods based on the signal enhancement algorithm are proposed for solving the direction-of-arrival estimation problem of multiple incoherent plane waves incident on a uniform linear array. The basic idea is that of finding the covariance matrix (or spectral density matrix) of given rank that lies closest to a given estimated matrix in the Frobenius norm sense. Superior resolution capabilities achieved with this approach are illustrated by simulation experiments in comparison with MUSIC for narrowband signals and with Wang and Kaveh's CSM-MUSIC method for broadband signals. (C) 1998 Academic Press.