基于块Hankel矩阵构造的双基地MIMO雷达相干多目标定位

摘要

该文提出了一种相干多目标情况下双基地MIMO雷达的收发角度估计方法.利用接收协方差矩阵中的元素构造块Hankel矩阵,该矩阵的秩等于目标的总个数,而与目标源的相干性无关,并通过奇异值分解获取信号子空间,最后运用ESPRIT算法估计出目标的发射角和接收角.仿真结果表明:本文算法能有效地估计出相干目标、的收发角,且实现自动配对；相对于2维空间平滑算法,在低信噪比和低快拍数情况下,具有更好的估计性能.%A new algorithm for angle estimation in the presence of coherent multi-target is presented. A block Hankel matrix is constructed by utilizing the elements of the receive covariance matrix. It is shown that the rank of the block Hankel matrix is equal to the number of targets, and is independent of the coherency of targets. The signal subspace is obtained by using the Singular Value Decomposition (SVD) of the block Hankel matrix. Thus the ESPRIT algorithm can directly be applied to estimate the Direction Of Departure (DOD) and the Direction Of Arrival (DOA). The simulation results illustrate that: the DOD and DOA of the coherent target can be estimated efficiently with automatic pairing. And comparing to the two-dimensional spatial smoothing algorithm, the proposed method provides better estimation performance, especially in the condition of low Signal to Noise Ratio (SNR) and low snapshot numbers.