“…According to the principle of the element‐space multiple signal classification (MUSIC) estimator [31–33], we obtain the transmit beamspace‐based MUSIC cost function [34, 35] where P n is the projection matrix onto the noise subspace The range and angle of targets can be estimated from the L magnitude peaks of (37) Now, the targets can then be localised in range–angle dimension by combining (18) with (39).…”