DOA Estimation in Mechanical Scanning Radar Systems Using Sparse Signal Reconstruction Methods

This work deals with the direction of arrival (DOA) estimation of multiple radar targets present in the mainlobe of a rotating antenna using sparse signal reconstruction methods. We exploit knowledge of the antenna main beam pattern and the fact that the antenna mechanical scanning impresses an amplitude modulation on the signals backscattered by the targets. Having studied Basis Pursuit (BP) and traditional Orthogonal Matching Pursuit (OMP) algorithm, an improved approach named Sensing Orthogonal Matching Pursuit (Sensing OMP) is proposed which utilizes a sensing dictionary to alleviate the effect of inter-atom interference in highly coherent dictionary. The performance of the DOA estimator is investigated through Monte Carlo simulations.