Moving Target Detection for FDA-MIMO Radar Based on Two-Step Radon-Fourier Transform

When Frequency Diverse Array multiple-input multiple-output (FDA-MIMO) radar implement coherent accu-mulation detector for moving targets, it is easy to encounter the across range unit (ARU) effects. Besides, due to the frequency offsets across adjacent array elements, serious Doppler spread (DS) will occur between received channels, making it impossible to be coherently accumulated and dramatically reducing the detection performance of the system. Aiming at this issue, a method of FDA-MIMO Radar motion target detection based on Radon-Fourier Transform (RFT) is proposed, that is Two-Step RFT (TSRFT). Firstly, the received channels are divided into two parts for conjugate multiplication, which achieves multi-channel accumulation before RFT. Then RFT is used to obtain a rough estimate of speed and reuse the speed estimation value for ID-RFT target detection, which reduces computational complexity compared to using traditional RFT. Simulation results reveal that the proposed method improves detection performance by suppressing DS and ARU effects.