An enhancement method for covariance matrix estimate with uniform circulararray

In this paper, we propose a new algorithm of enhancing covariance matrix es timate to be used for estimating the directions-of-arrival (DOAs) of multip le incoherent signals incident on a uniform circular array. The underlying covariance matrix possesses a special theoretical property such as having s patial stationarity. The proposed enhancement approach based on the use of this property is found to provide improved DOA estimates in comparison to t he unenhanced MUSIC for narrowband incoherent signals.