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距离迁移(RM)算法能够精确校正近场距离徙动,同时通过使用快速傅里叶变换可以达到很高的计算效率,具有应用于近场MIMO雷达三维实时成像的潜力。RM算法应用于近场MIMO成像的主要挑战是设计合适的阵列结构。文中利用球面波分解为无穷多个平面波的方法推导了MIMO雷达近场三维RM成像算法,在深入分析算法实现流程的基础上得到了RM算法对MIMO阵列构型的四条约束条件。提出了一种适用RM算法的MIMO阵列设计方法,并利用所提方法设计了MIMO阵列,结合仿真,分析了所设计阵列的成像性能。
The distance migration (RM) algorithm accurately corrects near-field distance migration and achieves high computational efficiency through the use of fast Fourier transforms with the potential for three-dimensional real-time imaging of near-field MIMO radar. The main challenge of applying the RM algorithm to near-field MIMO imaging is to design a suitable array structure. In this paper, we use the method of spherical wave decomposing into infinite plane waves to derive the MIMO radar near-field three-dimensional RM imaging algorithm. Based on the analysis of the flow of the algorithm, four constraints of the RM algorithm on the MIMO array configuration are obtained. A MIMO array design method based on RM algorithm is proposed. The MIMO array is designed by using the proposed method. Combined with simulation, the imaging performance of the designed array is analyzed.