斜投影三维极化滤波

为解决传统三维极化滤波造成的高频地波雷达目标信号极化损失和相位失真,提出一种基于斜投影的三维极化滤波方法,利用目标和干扰的矢量信号分别构建信号和干扰矢量子空间,使用斜投影算子作为滤波矢量进行三维极化滤波.与传统的三维极化滤波相比,基于斜投影的三维极化滤波方法在完全滤除干扰信号的同时对目标信号的幅度和相位不产生影响,有效提高了滤波器输出信号和干扰噪声功率之比(SINR)及信号相参性.仿真结果证实了该算法可以有效抑制高频地波雷达中的干扰信号.

Three-dimensions polarization filtering based on oblique projection

To solve the problem of target polarization loss and phase distortation of conventional three-dimension polarization filter for High Frequency Surface Wave Radar(HFSWR),a three-dimension polarization filter approach based on oblique projection is proposed in this paper.The spatial polarization parameters of the target signal and interference signal are used to span the corresponding subspace respectively,and then an oblique projection operator is obtained to form a polarization filter vector.Compared with the conventional three dimensions polarization filter,no amplitude loss and phase distortion of the target signals are introduced while the interference is mitigated perfectly,the improvement of significant signal to interference plus noise power ratio(SINR) can be expected and the phase coherence of the target signal can be kept.The simulation results indicate that the proposed method can effectively suppress the polarized interference for HFSWR.