2-dimentional DOA estimation using ESPRIT algorithm in ARM confronting coherent decoy

Because of the intrinsic defect of passive radar seeker (PRS) of ARM, it can't distinguish coherent decoys from far distance. Using extended-aperture confronting coherent decoys for ARM is proposed in this paper, and a new 2-dimentional DOA estimation ESPRIT algorithm is presented. This algorithm uses the characteristic of a new special array to construct a special covariance matrix. With this algorithm the DOA of coherent decoys can be estimated without spatial smoothing techniques and spectrum peak searching. Elevation and azimuth estimations can also be paired automatically. Simulations demonstrate the effectively to distinguish radar and bait from the directions of arrival and the significant performance gain realizable by this method for ARM confronting coherent decoys.