A cutoff invariant two-scale model in electromagnetic scattering from sea surfaces
A cutoff invariant two-scale model in electromagnetic scattering from sea surfaces
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DOI：
10.1109/lgrs.2008.915746
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发表时间：
2008-04-01
影响因子：
4.8
通讯作者：
Guerin, Charles-Antoine
中科院分区：
文献类型：
--
作者：
Soriano, Gabriel;Guerin, Charles-Antoine
双尺度模型（TSM）是研究多尺度表面（如海面）散射问题最常用的方法之一。它包括几何光学（GO）与小扰动模型（SPM）相结合，能够科普表面的小尺度和大尺度分量。然而，这种方法的缺点是划分尺度的任意性和散射截面对该参数的选择的敏感性。我们建议用一阶小斜率近似（SSA 1）代替SPM来处理小尺度粗糙度，并推导出相应的TSM公式，称为GO-SSA。我们表明，GO-SSA是强大的频率截止的选择，并给出了一个数值例子的海面。
The two-scale model (TSM) is one of the most frequently employed approaches in scattering from multiscale surfaces such as ocean surfaces. It consists of combining geometrical optics (GO) with the small-perturbation model (SPM) to be able to cope with both the small- and large-scale components of the surface. However, well-known shortcomings of this method are the arbitrariness of the dividing scale and the sensitivity of the scattering cross section to the choice of this parameter. We propose to replace SPM with the first-order small-slope approximation (SSA1) to treat the small-scale roughness and derive the formulas for the corresponding TSM, referred to as GO-SSA. We show that GO-SSA is robust to the choice of the frequency cutoff and give a numerical illustration for the sea surface.