| Citation: | YOU Z Y，HU G P，ZHOU H，et al. Joint DOA and DOD estimation of bistatic MIMO radar coherent targets based on smoothing matrix sets optimization[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（1）：268-275 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0173
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Due to the rank-deficient phenomenon of the covariance matrix in coherent targets estimation, a algorithm based on diversity smoothing optimization for joint estimation of coherent target wave direction of departure (DOD) angle and direction of arrival (DOA) is proposed to solve the problems of poor accuracy and low angular resolution of coherent target detection by bistatic multiple input multiple output (MIMO) radar. The proposed algorithm can construct a more effective smooth matrix sets for joint angle estimation of coherent targets through diversity smoothing and reducing the covariance matrix. Perform diversity smoothing on the transmit array and receive array, construct transmit sub-vectors, and calculate their covariance matrix. Smooth and reconstruct the covariance matrix of each transmit sub-vector and then perform weighting to obtain a forward smoothing matrix. The forward smoothing matrix is transformed by conjugate flipping and other transformations, and the forward and backward smoothing matrix is obtained, on which the singular value decomposition (SVD) is then performed. The spatial spectrum of the signal is estimated by using the reduced dimension multiple signal classification (RD-MUSIC) algorithm, and the automatic pairing of DOD and DOA is realized. The proposed algorithm effectively improves the direction performance of bistatic MIMO radar for coherent targets, and the feasibility of the proposed algorithm is proved by experiments.
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