Abstract
An improved method for joint angle and Doppler frequency estimation in bistatic multiple-input multiple-output (MIMO) radar is proposed. The characteristic of the Vandermonde matrix is employed to expand the virtual array in MIMO radar. Then the rotational invariance produced by the time delay sampling is extracted to estimate the angles and Doppler frequencies. The proposed algorithm is suitable for non-uniform linear arrays and the estimations of Doppler frequency, direction of departure (DOD) and direction of arrival (DOA) are automatically paired. The estimation performance of our approach is better than the estimation of signal parameters via rotational invariance techniques (ESPRIT)-based method due to the expansion of the virtual array, which also increase the maximum detection number of targets. Cramer–Rao bound of angle and Doppler frequency estimation in MIMO radar is derived. Simulation results verify the usefulness of our approach.
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