多输入多输出雷达波束空间ESPRIT角度估计方法

In order to obtain better angle estimation performance at less cost, a beamspace conjugate ESPRIT algorithm for direction of arrival (DOA) estimation in multiple-input multiple-output (MIMO) radar is presented. Firstly, the reduced-dimensional transformation is utilized to transform the observed data into a lower-dimensional space. Then an augmented observation data matrix with double number of effective elements is constructed by taking advantage of the property of the noncircular signals and is mapped into beamspace. Finally, the rotational invariance property of the real-valued beamspace array manifold is constructed and exploited to find the directions of the targets. Compared to the conventional ESPRIT, the presented method can obtain greatly improved estimation performance and can achieve a significant reduction in the amount of computation. Numerical examples are presented to illustrate the performance of the presented algorithm.