基于冗余阵元优化的双基地嵌套MIMO雷达目标DOD和DOA联合估计方法  

Bistatic nested MIMO radar based on redundant element optimization joint estimation method of target DOD and DOA

作　　者：游致远 胡国平[1] 周豪[1] YOU Zhiyuan;HU Guoping;ZHOU Hao(Air And Missile Defense College,Air Force Engineering University,Xi’an 710051,China)

机构地区：[1]空军工程大学防空反导学院,陕西西安710051

出　　处：《系统工程与电子技术》2022年第12期3696-3702,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(62071476)资助课题。

摘　　要：针对传统双基地嵌套多输入多输出(multiple input multiple output,MIMO)雷达进行目标参数估计时精度差、角度分辨率低和自由度低等问题,提出了一种基于利用虚拟冗余阵元的重建Toeplitz矩阵算法对目标的波离方向角(direction of departure,DOD)和波达方向角(direction of arrival,DOA)开展参数估计的方法。首先,将两个嵌套阵列空间分置后分别形成双基地MIMO雷达的接收阵列和发射阵列,阵列经处理后的虚拟接收信号存在大量冗余虚拟阵元。其次,将冗余虚拟阵元对应的协方差数值进行平均处理替代原值,形成新的虚拟接收信号。然后,通过利用两个选择矩阵在虚拟接收阵列和虚拟发射阵列中分别构建空间平滑子阵的方法重构Toeplitz矩阵,来重组虚拟接收信号。最后,利用常规子空间类算法对等效虚拟信号开展空间谱估计,实现DOD和DOA的相互匹配,所提算法在估计性能和自由度性能方面与其他算法对比效果更好。Aiming at the problems of poor accuracy,low angular resolution,and low degree of freedom in traditional bistatic nested multiple input multiple output(MIMO)radar for target parameter estimation,a method based on the use of virtual redundant array elements is proposed.The reconstructed Toeplitz matrix algorithm is a method of parameter estimation for the direction of departure(DOD)and direction of arrival(DOA)of the target.Firstly,the two nested sub-arrays are arranged with the zero point as the center to form the receiving array and the transmitting array of the bistatic MIMO radar.The virtual receiving signal processed by the array has a large number of redundant virtual array elements.Secondly,the covariance values corresponding to the redundant virtual array elements are averaged to replace the original values to form a new virtual received signal,and then two selection matrices are used to construct spatial smoothing sub-arrays in the virtual receiving array and the virtual transmitting array.The method reconstructs the Toeplitz matrix to reconstruct the virtual received signal.Finally,the conventional subspace algorithm is used to estimate the space spectrum of the equivalent virtual signal to realize the mutual matching of DOD and DOA.The proposed algorithm compares better with other algorithms in terms of estimation performance and degree of freedom performance.

关 键 词：冗余虚拟阵元 嵌套阵列 双基地多输入多输出雷达 角度联合估计 

分 类 号：TN953[电子电信—信号与信息处理]