SELECTIVE-COORDINATE ITERATIVE ADAPTIVE APPROACH FOR MIMO RADAR DOA ESTIMATION

Recently, the iterative adaptive approach (IAA) method has been adopted to allow for high-resolution direction of arrival (DOA) estimation of MIMO radar. In this paper, the computational complexity caused by traditional rough convergence criterion is reduced by following a selective-coordinate iterative strategy. First, we analyze the iterative termination criterion of the current IAA. Then, considering a novel criterion that defined by the absolute value of the adjacent iterative points of each coordinate, those coordinates that are not converged can be selectively iterated. In this way, unnecessary iterative calculations can be greatly reduced. Finally, the complexity of IAA and the proposed method are compared and analyzed in detail. Simulation and measured data illustrate that the proposed method offers a computational complexity reduction without loss of performance.