双基地MIMO雷达相干目标的角度快速估计算法  

Target Rapid Location of Coherent Target for Bistatic MIMO Radar

作　　者：李小波[1] 张正言[1] 王珽[2] 徐旭宇[3] 

机构地区：[1]合肥电子工程学院 [2]信息工程大学导航与空天目标工程学院 [3]73677部队

出　　处：《信号处理》2016年第3期370-377,共8页Journal of Signal Processing

摘　　要：针对双基地多输入多输出(MIMO)雷达定位的实时性问题,提出了一种基于Toeplitz矩阵的目标快速定位算法。双基地MIMO雷达接收的信号往往是相干的,因此无法直接应用角度估计算法。首先通过接收的数据得到一组Toeplitz子矩阵,利用这组子矩阵重构得到协方差矩阵,其秩等于目标个数,达到解相干的目的。采用改进多级维纳滤波器(MSWF)的前向递推,不需要通过特征值分解,得到信号子空间,结合ESPRIT算法,估计出目标的发射角度(DOD)和接收角度(DOA)。算法通过构造Toeplitz矩阵解相干,仅改变矩阵结构,降低了计算复杂度,具有较好目标分辨力和解相干能力。A target rapid location method based on Toeplitz matrix is proposed for the instant problem among target location in bistatic multiple-input multiple-output（ MIMO） radar. The received signal is often coherent in bistatic MIMO radar,so the angle estimation algorithm can＇ t be applied directly. Firstly,the recived data is used to get a set of Toeplitz submatrices which is utilized for constructing a covariance matrix for the sake of eliminating the influence of coherence. The rank of this matrix is equal to the number of targets. Then the single subspace can be got through forward recursion of the multistage wiener filtering（ MSWF）,not through the matrix eigenvalue decomposition. The direction of departure（ DOD） and direction of arrival（ DOA） of coherent singles can be estimated combined with ESPRIT. The algorihm eliminates the influence of coherence by constructing toeplitz matrix,only changes the matrix structure and reduces the computational complexity. This method whose computational complexity is low increases the target distinguish and the ability of estimation of coherent targets.

关 键 词：双基地MIMO雷达 低复杂度 角度快速估计 信号子空间 

分 类 号：TN958[电子电信—信号与信息处理]