Parameters estimation of coherently distributed sources in the presence of mutual coupling

In this paper, we consider the problem of parameters estimation of coherently distributed (CD) sources using doublet parallel uniform linear array (ULA) in the presence of mutual coupling. Unlike the mutual coupling matrix of ULA, the mutual coupling matrix of doublet parallel uniform linear array (ULA) is only symmetric but not Toeplitz. Aiming at this point, a decoupling parameters estimation method is proposed. In the proposed algorithm, only one auxiliary source is needed to calibrate mutual coupling effects. After calibrating the mutual coupling, we can estimate the central DOA of CD sources using TLS-ESPRIT accurately. Once DOA is estimated, the angular spread can be obtained by one-dimensional spectrum searching instead of two-dimensional spectrum searching. Simulation results demonstrate the validity of the proposed method