基于全极化GTD模型的雷达目标二维散射中心提取

摘要

To extract the radar target scattering centers, a novel two-dimensional polarization linear variation ESPRIT (2D-PL-ESPRIT) method based on full-polarization 2D-GTD model is proposed. Meanwhile, theoretical analysis shows the feasibility of the 2D-PL-ESPRIT method to extract the scattering centers. However, the estimation accuracy is improved and the computational load is greatly decreased compared with the method for extracting the parameters from multiple single polarization channels. Compared with the parallel polarization MUSIC method (2D-PP-MUSIC), the new method avoids the searching of the spatial spectrum and getting scattering types from the orthogonal method. The complex multiplication computational complexity of three methods shows that the 2D-PL-ESPRIT owns the high operation efficiency. Finally, simulations show the validity of 2D-PL-ESPRIT method on full-polarization 2D-GTD model to extract the scattering centers.%针对全极化二维GTD散射中心模型,首先提出一种二维极化线性变化(polarization linear variation PL)的ESPRIT算法(2D-PL-ESPRIT)用于提取雷达目标散射中心参数；其次,就2D-PL-ESPRIT算法提取目标散射中心的可行性进行了理论分析.相比通过多个单极化通道方法提取散射中心,2D-PL-ESPRIT算法可以有效提高参数估计精度,降低计算复杂度；相比二维极化并行(parallel polarization,PP)的全极化MUSIC方法(2D-PP-MUSIC),2D-PL-ESPRIT算法避免了复杂的二维谱峰搜索以及通过子空间正交方法判断散射类型的步骤,有效降低了运算量.之后,对三种算法进行了复乘计算量的比较以说明2D-PL-ESPRIT算法具有较高的运算效率.最后,通过仿真实验验证了2D-PL-ESPRIT方法用于全极化2D-GTD模型散射中心提取的有效性.