Coherent multiple-input–multiple-output (MIMO) radar could significantly improve the weak moving target detection ability by accumulating multichannel and multiframe echo signal. However, due to the target motion and the geometric configuration differences of each node relative to the target, the multichannel multiframe accumulation of target echoes by coherent MIMO radar faces several difficulties, i.e., range migration (RM) and Doppler frequency migration (DFM) issues within each channel, spatial variations of target signal envelope and phase across different channels, time variations of target signal envelope, and phase across different frames. To tackle these problems, two contributions are made in this article. First, by applying the generalized radon Fourier transform (GRFT) to correct the RM/DFM and obtain the signal integration within each channel, we propose a multichannel accumulation algorithm to compensate the spatial variations of target signal and realize the target energy accumulation across different channels, which takes full advantage of the GRFT output characteristics and the radar system topological structure. Second, a multiframe accumulation algorithm is developed to compensate the time variations of target signal and achieve the further integration of target energy distributed in different frames. We also provide explicit expressions and analysis for performance metrics, including the output response, SNR improvement performance. The proposed method's effectiveness is confirmed through simulation experiments.
Multichannel Multiframe Integration Detection Method for Weak Target With Coherent MIMO Radar
IEEE Transactions on Aerospace and Electronic Systems ; 61 , 3 ; 6518-6536
2025-06-01
6790335 byte
Article (Journal)
Electronic Resource
English