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在全极化逆合成孔径雷达(ISAR)体制下,二维相干极化几何绕射(CP-GTD)模型能够精确描述雷达目标高频电磁极化散射特性。针对CP-GTD模型,提出了一种基于空域滤波的二维全极化散射中心参数快速提取方法。该方法利用空域滤波将二维全极化散射中心参数提取问题分解为多个一维全极化散射中心提取问题,进而利用一维旋转不变技术(1D-ESPRIT)分步对全极化散射中心各维参数进行联合估计,最后利用最小二乘方法获得相干极化散射矩阵的估计。此外,采用这样的分步估计过程,可以实现二维参数的自动配对。复杂度分析和仿真实验表明:该方法不仅能够显著降低运算量,并且还能获得较好的估计精度,可以有效地用于目标全极化散射中心提取。
Under the fully polarized inverse synthetic aperture radar (ISAR) system, the two-dimensional coherent polarization geometrical diffraction (CP-GTD) model can accurately describe the high-frequency electromagnetic polarization scattering characteristics of radar targets. Aiming at the CP-GTD model, a fast space-domain filtering method based on two-dimensional fully-polarized scattering center parameters is proposed. The method uses spatial filtering to decompose the problem of extracting the parameters of the two-dimensional fully-polarized scattering center into multiple one-dimensional fully-polarized scattering centers, and then uses the 1D-ESPRIT to step-by-step analyze the polarization of all-polarization The central parameters of the joint joint estimation, and finally the least squares method to obtain the coherent polarization scattering matrix estimation. In addition, using such a step-by-step estimation process, two-dimensional parameters can be automatically paired. The complexity analysis and simulation results show that this method can not only reduce the computational complexity significantly, but also get better estimation accuracy, which can be effectively used in the target total polarization scattering center extraction.