Joint Transmitting Subarray Partition and Beamforming for Active Jamming Suppression in Phased‐MIMO Radar

Abstract

AbstractAs the tradeoff between conventional phased‐array and multiple‐input multiple‐output (MIMO) radars, phased‐MIMO radar has been studied in recent years, which can simultaneously obtain coherent processing gain and waveform diversity gain. In this paper, in order to effectively suppress the jamming signal and improve the target detection performance of radar system, a joint transmitting subarray partition and beamforming method in phased‐MIMO radar is proposed. To be specific, at the transmitter, the transmitting array of radar system is partitioned into a certain number of non‐overlapped subarrays, and the subarray structure of transmitting array and the corresponding beamformer weight vectors are simultaneously optimized by constructing the optimization model of maximizing the signal‐to‐noise ratio of the whole received echoes under certain constraint conditions, so as to effectively maximize the power utilization of radar transmitter, reduce the peak sidelobe level of transmit beampattern and improve the radar anti‐jamming performance. Moreover, the adaptive beamforming technique is applied to suppress the jamming signal entering the receiver, so that the transmitting and receiving adaptive degrees of freedom are jointly utilized to enhance the anti‐jamming capability of radar system. Simulation results demonstrate the validity of the proposed method.