Signal enhancement approach for high resolution of multiple broadband incoherent sources

Several methods based on the signal enhancement algorithm are proposed for solving the direction of arrival estimation problem for multiple incoherent plane waves incident on a uniform linear array. The basic idea is that of finding a spectral density matrix of given rank that lies closest to a given spectral density matrix in a Frobenius norm sense. Superior resolution capabilities achieved with this approach are illustrated by comparing the results of simulation experiments with the results for H. Wang and M. Kaveh´s (1985) CSS-MUSIC focusing method