基于L形嵌套的混合MIMO相控阵雷达阵列设计

Design of Hybrid Phased-MIMO Radar Based on L-shaped Nesting Array

混合MIMO相控阵雷达发射端的子阵分割会导致自由度损失,为了解决这一问题,提出了一种基于嵌套阵结构的L形收发阵列设计方法。首先将发射端的混合MIMO相控阵雷达线阵纵向放置,然后接收阵列设计为横向布置的嵌套阵结构,最后通过在虚拟阵列中构造差异阵列,以L形的线阵结构实现了二维混合MIMO相控阵雷达的功能。通过形成虚拟阵元数目扩展,在保留混合MIMO相控阵雷达优势的同时增大了阵列自由度。且本文给出了这种结构下阵列流形的闭合表达式。仿真结果表明,与传统的混合MIMO相控阵雷达相比,这种方法能够提高自由度和波达方向估计精度。

Subarray partitioning at the transmit end of hybrid phased-MIMO radar will lead to the loss of freedom.A design method of L-shaped array based on nested array structure is proposed to solve this problem.Firstly,the line hybrid phased-MIMO radar at the transmit end is placed longitudinally,and then the receive array is designed as a horizontally arranged nested array structure.Finally,by constructing difference coarray in virtual array,the function of two-dimensional hybrid phased-MIMO radar is realized with the L-shaped linear array structure.The number of elements is expanded by forming a virtual array,and the degree of freedom is increased while preserving the advantages of the hybrid phased-MIMO radar.And the closed expression of the array manifold under this structure is given.Simulation results shows that compared with the traditional hybrid phased-MIMO radar,this method can improve the degree of freedom and direction-of-arrival estimation accuracy.