A efficient DOA estimation algorithm of coherent sources for MIMO radar

To estimate the DOA of coherent sources of MIMO radar, a new spatial smoothing (SS) technique based on MIMO radar is presented using the diversity of the transmitted waveform and the independence of the transmitting-receiving channel. In the technique, the array is not necessary to be divided into sub-arrays, the received signal of the virtual sub-arrays are extracted from the output of the matched filter banks of MIMO radar, and then the auto-correlation matrix of the sub- array is derived. The technique in this paper can avoid the reduction of the array effective aperture, and adapt to arbitrary array structures, and increase the maximum number of coherent signals that can be estimated. Some numerical examples are simulated to verify the effectiveness of the technique.