基于TR MIMO雷达的相干目标DOA估计

DOA Estimation for Coherent Targets Based on TR MIMO Radar

针对MIMO(multi-input multi-output)雷达相干目标DOA(direction of arrival)估计问题,提出了一种基于Toeplitz矩阵重构的时间反转(time reversal,TR)MIMO雷达相干目标DOA估计算法。算法根据MIMO雷达接收信号模型,利用时间反转理论,建立TR MIMO雷达接收信号模型。在此模型的基础上,采用Toeplitz矩阵重构算法,去除目标的相干性,并基于一阶近似理论,利用优化迭代的方法进行DOA估计,进一步提高DOA估计的精度,并降低了计算复杂度。计算机仿真结果表明,在相同的快拍数与信噪比条件下,与传统的非时间反转MIMO雷达相比,文中的算法有更低的计算复杂度与更高的估计精度。

For coherent targets direction of arrival(DOA)estimation problem of MIMO radar,a DOA estimation algorithm for coherent targets of TR MIMO radar based on Toeplitz matrix method is proposed.Algorithm use TR theory according to the received signal model of MIMO radar to establish the received signal model of TR MIMO radar.Using Toeplitz matrix method based on the received signal model which removes the coherency of targets and utilizing an optimized iterative approach based on the first-order approximate theory that carries out DOA estimation further improve the estimation accuracy and reduce computation complexity.The results of computer simulation show that the proposed method has lower computation complexity and higher estimation accuracy compared with the conventional non-TR MIMO radar under the same snapshots and signal-to-noise ratio conditions.