Joint DOD and DOA Estimation Using Real Polynomial Rooting in Bistatic MIMO Radar

An algorithm for joint direction-of-departures (DODs) and direction-of-arrivals (DOAs) estimation using real polynomial rooting in bistatic multiple-input multiple-output (MIMO) radar is presented. Compared with the conventional spectral Capon method, the proposed approach estimates the angles by the alternating maximization (AM) algorithm and one-dimensional real polynomial rooting instead of two-dimensional angle search to reduce the computational burden. The novel real root-Capon method can perform well even without the prior knowledge of the initial values of unknown parameters which is a prerequisite to AM algorithm. Furthermore, the DODs and DOAs of targets can be paired automatically. Numerical examples validate the effectiveness of the algorithm.