Real-valued localisation algorithm for near-field non-circular sources

A novel real-valued near-field localisation algorithm for non-circular sources is proposed using the uniform linear array. On the basis of non-circularity of signals, an extended real-valued covariance matrix is constructed. Then, utilising the symmetric property of the extended array manifold, the direction of arrival and range parameters are obtained by two one-dimensional rank reduction estimators. The proposed algorithm is efficient in that it only requires second-order statistics (SOS) and real-valued computations. Moreover, it can improve the estimation accuracy and resolve more sources than the conventional SOS-based methods.