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针对多径效应严重影响MIMO雷达低仰角估计精度的问题,建立了MIMO雷达多径信号模型,借助广义MUSIC思想实现多径入射角度和衰减系数的联合估计,获得虚拟的多径衰减系数,同时利用酉变换矩阵的特性,构造实数域的数据矩阵,提出一种基于酉变换的二次广义MUSIC算法(DU‐G_MUSIC),得到实数域上优化的低仰角估计值。多径衰减系数与角度估计相结合,极大的提高了运算效率,避免了繁琐的解相关平滑处理程序,获得较高的角度分辨力,在不损失阵列孔径的前提下,降低了对阵列结构的特殊要求,具有较高的工程使用价值。
Aiming at the problem that multipath effect seriously affects the accuracy of low elevation estimation of MIMO radar, a multipath signal model of MIMO radar is established. By using the generalized MUSIC theory, the joint estimation of multipath incident angle and attenuation coefficient is achieved, and the virtual multipath attenuation coefficient is obtained. Unitary transformation matrix and construct the data matrix of real number domain, a quadratic generalized MUSIC algorithm based on unitary transformation (DU-G_MUSIC) is proposed to obtain the optimized low elevation estimation value in real number domain. The combination of multipath attenuation coefficient and angle estimation greatly improves the computational efficiency, avoids the cumbersome solution smoothing process, and achieves high angular resolution. It reduces the complexity of the array structure without losing the aperture of the array The special requirements, with high value of the project.