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Angular Composite Facet Model with Shadowing Treatment for Backscattering from Two-Dimensional Rough Sea Surface

机译:具有遮蔽处理的角复合刻面模型,从二维粗糙海面后散射散射

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摘要

Recent diverse applications on ocean wave synthetic aperture radar (SAR) images have a potential demand for individual facet scattering contribution rather than the total average radar cross-section (RCS) by statistical scattering models. However, only a few facet methods have been proposed and fewer have considered shadowing effects, which are thought to be non-negligible at large incident angle. In view of this, we proposed an angular composite facet model (ACFM) with shadowing treatment to investigate the backscattering from two-dimensional rough sea surface. First, a region division formula for ACFM without shadowing treatment is proposed to classified sea surface facets into specular facets and diffusion facets based on which kind of scattering is dominate from each facet, and the corresponding scattering contribution is calculated either by Kirchhoff approximation (KA) or by a small perturbation method (SPM) with a tilting process. Second, an electromagnetic shadowing algorithm based on facets grouping is adopted to handle the shadowing effects in a geometric manner with moderate computation complexity gained. Finally, comparisons between numerical backscattering evaluations and experimental data demonstrate that this new ACFM can attain accurate numerical results and the geometric facets grouping method is a practical way to tackle shadowing effects despite a certain acceptable gap. Therefore, the whole ACFM can simulate ocean wave SAR imaging, especially for those electrically large surfaces and to evaluate the scattering from sea surface with different local nature, such as sea spikes, foams, spilled oil, swells, and ship wake.
机译:近期海浪合成孔径雷达(SAR)图像的多样化应用对单个方面散射贡献而不是统计散射模型的总平面散射贡献而不是总平均雷达横截面(RCS)。然而,已经提出了几个方面方法,并且较少已经考虑了阴影效果,这被认为是大入射角的不可忽略不可或缺的方法。鉴于此,我们提出了一种具有遮蔽处理的角复合面模型(ACFM),以研究来自二维粗糙海面的反向散射。首先,提出了在没有遮蔽处理的情况下的区域分配公式,以将海面刻面分为镜面小平面和扩散刻面,基于以下哪种散射从每个方面支配,并且相应的散射贡献是通过kirchhoff近似(ka)计算的或通过小型扰动方法(SPM)具有倾斜过程。其次,采用基于小平面分组的电磁染色算法以以所获得的中等计算复杂性以几何方式处理阴影效果。最后,数值反向散射评估和实验数据之间的比较表明,这种新的ACFM可以获得准确的数值结果,并且几何小平面分组方法是尽管存在某种可接受的间隙,但是尽管存在某种可接受的差距,但是尽管存在遮蔽效果的实用方法。因此,整个ACFM可以模拟海浪SAR成像,特别是对于那些电气大的表面,并以不同的本地性质评估海面的散射,例如海尖峰,泡沫,溢油,膨胀和船舶。

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