二维嵌套混合MIMO相控阵雷达接收阵列设计  

Design of receiving array of two-dimensional nested hybrid MIMO phased-array radar

作　　者：刘帅琦 王布宏[1] 李夏[1] 刘新波[1] 曹帅 LIU Shuaiqi;WANG Buhong;LI Xia;LIU Xinbo;CAO Shuai(Information and Navigation College, Air Force Engineering University, Xi＇an 710077, China;Unit 93995 of the PLA , Xi＇an 710306, China;Unit 93801 of the PLA , Xianyang 712200, China)

机构地区：[1]空军工程大学信息与导航学院,西安710077 [2]中国人民解放军93995部队,西安710306 [3]中国人民解放军93801部队,咸阳712200

出　　处：《航空学报》2018年第4期173-181,共9页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(61671465)

摘　　要：针对二维混合多输入多输出(MIMO)相控阵雷达发射阵列子阵分割带来的自由度损失问题,提出一种基于二维嵌套阵列的二维混合MIMO相控阵雷达接收阵列设计新方法。首先,给出一种由稀疏阵列和密集阵列构成的嵌套阵接收阵列的二维混合MIMO相控阵雷达信号模型;其次,通过对接收信号的协方差矩阵进行Khatri-Rao乘积处理,得到阵元位置差的差异阵列,形成接收阵元数目的虚拟扩展;最后,通过空间平滑处理进行波达方向估计。仿真实验表明,与传统二维混合MIMO相控阵雷达相比,所提方法在不增加实际阵元数目的情况下可以有效扩展虚拟阵元数目,提高雷达阵列自由度,进而提高二维混合MIMO相控阵雷达波达方向估计精度。Division of the transmit array of the two-dimensional hybrid Multiple-Input Multiple-Output（MIMO）phased-array radar will cause the problem of loss of Degrees of Freedom（DOF）.This paper proposes a method for the design of the receiving array of the two-dimensional hybrid MIMO phased-array radar based on the two-dimensional nested array.A signal model for the radar is given,which consists of the sparse array and the dense array.Then by constructing the Khatri-Rao product of the covariance matrix of the receiving signal,virtual extension of array elements is achieved by forming the difference co-array.Direction of arrival estimation is conducted based on spatial smoothing.Simulation results demonstrate that the proposed method can improve degrees of freedom without increase of elements,and then improve DOF estimation accuracy of the two-dimensional hybrid MIMO phased-array radar.

关 键 词：二维混合MIMO相控阵雷达 二维嵌套阵列 差异阵列 自由度(DOF) 波达方向估计 

分 类 号：V243.2[航空宇航科学与技术—飞行器设计] TN820[电子电信—信息与通信工程]