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针对既有水平极化发射水平极化接收,又有垂直极化发射垂直极化接收数据的双极化雷达目标散射中心模型,提出用四元数MUSIC算法进行参量提取。该算法首先将hh和vv数据用四元数联系起来,然后采用MUSIC算法的思想,构造四元数信号子空间和四元数噪声子空间,并利用四元数噪声子空间和四元数信号子空间相互正交的特性,通过谱峰搜索估计双极化散射中心的参量。同复数域的MUSIC算法相比,四元数MUSIC算法在信噪比较低时仍能较好地估计出散射中心参量。仿真实验验证了算法的有效性。
Aiming at the target scattering center model of dual-polarization radar with both horizontal polarization receiving horizontal polarization and vertical polarization vertical polarization receiving data, quaternion MUSIC algorithm is proposed to extract the parameters. The algorithm first links hh and vv data with quaternions, and then uses the idea of MUSIC algorithm to construct quaternion signal and quaternion noise subspace, and uses quaternion noise subspace and quaternion signal The subspaces are orthogonal to each other and the parameters of the dual-polarization scattering center are estimated by spectral peak search. Compared with the MUSIC algorithm in complex domain, the quaternion MUSIC algorithm can still better estimate the scattering center parameters when the SNR is low. Simulation results show the effectiveness of the algorithm.