双基地MIMO雷达二维方位角及多普勒频率联合估计

Joint estimation of 2-D azimuth and Doppler frequency for bistatic MIMO radar

提出了一种新的双基地多输入多输出(multiple-input multiple-output,MIMO)雷达二维方位角及多普勒频率联合估计算法。该算法基于m-Capon方法将目标波离方向(direction of departure,DOD)与波达方向(direction of arrival,DOA)相"去耦",得出了对目标DOD和DOA的估计;然后,在对目标二维方位角的估计的基础上,算法可进一步估计出目标的多普勒频率。因此,其估计出的目标二维方位角与多普勒频率可自动配对。该算法无需预判目标数及对数据协方差矩阵特征值分解,且对目标二维方位角与多普勒频率的联合估计不涉及高维的非线性优化搜索,具有较小的计算量。此外,该算法可适用于发射和接收阵列为任意阵列结构的双基地MIMO雷达系统。计算机仿真结果证明了本文方法的正确性和可行性。

A novel joint estimation algorithm of 2-D azimuth and Doppler frequency for bistatic multipleinput multiple-output （MIMO） radar is proposed. The proposed algorithm can ＂decouple＂ the direction of departure （DOD） and direction of arrival （DOA） based on the m-Capon method, and then Doppler frequency can be estimated accurately through the estimation of DOD and DOA, so the estimated DODs, DOAs and Doppler frequencies can be automatically paired. The proposed algorithm skips targets number estimation and the eigen value decomposition （EVD） of data covariance matrix estimation, and the joint estimation of 2-D azi- muth and Doppler frequency only needs a one-dimensional search, with no high-dimensional nonlinear search, therefore, it can reduce the computational complexity. Furthermore, the proposed algorithm is suitable for bistatic MIMO radar with arbitrary transmitted and received geometrical configuration. The correction and efficiency of the proposed method are verified by the computer simulation results.