Estimation of the DOAs of Coherent Signals in Beam Space Processing for Phased Arrays

Abstract

Standard high resolution DOA estimation techniques such as MUSIC fail when the received signals are correlated. However spatial smoothing of the element space (ES) covariance matrix of receiver outputs overcomes the rank deficiency of the signal subspace and allows high accuracy DOA estimates to be obtained. In beam space (BS) array processing the ES covariance matrix is not available and spatial smoothing techniques cannot be directly applied. In this paper an ES covariance matrix reconstituted from the BS covariance matrix is proposed to which spatial smoothing techniques can be applied.