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.