4-D parameter estimation in bistatic MIMO radar for near-field target localization

The existing target localization algorithms in bistatic multiple-input multiple-output (MIMO) radar are based on the far-field assumption. However, when the targets are located close to the transmit and receive arrays, these algorithms are no longer valid. Aiming at the problem of near-field target localization in bistatic MIMO radar, the paper presents a novel algorithm of parameter estimation based on the centro-symmetric transmit and receive arrays. Four cross-covariance matrices of the received array data are employed and the eigenvalues and eigenvectors of two constructed matrices are obtained to estimate the four-dimensional (4-D) parameters, including the direction-of-departure (DOD), the direction-of-direction (DOA), the range from transmitter to target, and the range from target to receiver. This proposed algorithm avoids spectrum peak search, therefore the amount of calculation is small. Also, the parameters can be well paired. The simulations demonstrate the effectiveness of the propose method.