DOA estimation in MIMO radar based on coherent siganl-subspace method

MIMO radar in this paper uses sparse-array to transmit the FMCW signals of multiple carrier frequencies, and an array to receive the echoes. Due to transmit signals of multiple carrier frequencies, the Doppler frequency of the received signals after separated is not in a Doppler cell, and then the traditional supper-resolution algorithms work ineffectively, the parameters of the target can´t be obtained. One method is presented in this paper. Firstly the data of different frequency is transformed into the data of the same frequency using focusing transformation, and then the spatial spectrum estimation algorithms are applied. The simulation results indicate the validity of the methods presented in this paper.