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arXiv 1302.0161math.APcs.NAmath.NA
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局部粗糙表面散射的新型积分方程及其在反问题中的应用

A novel integral equation for scattering by locally rough surfaces and application to the inverse problem

Haiwen Zhang, Bo Zhang

AI总结:

针对局部粗糙表面的声波或电磁波散射问题,提出一种定义在带两个角点的有界曲线上的新型积分方程,并基于该方程开发了用于重构局部扰动的牛顿迭代法。

摘要:

本文研究局部扰动、完全反射的无限平面(本文称为局部粗糙表面)的声波或电磁波正散射和逆散射问题。我们为正散射问题提出了一种新型积分方程公式,该方程定义在一条带有两个角点的有界曲线上(该曲线由包含局部扰动的无限平面的有界部分和圆的下部组成)。这种新型积分方程可以通过使用Kress先前引入的渐变网格的Nyström方法高效求解,并且能够处理大波数情况。对于逆问题,我们基于新型积分方程公式,提出了一种牛顿迭代方法,利用多频远场数据重构平面的局部扰动。数值实验表明,即使对于多尺度轮廓的情况,我们的重构方法也是稳定且精确的。

英文摘要:

This paper is concerned with the direct and inverse acoustic or electromagnetic scattering problems by a locally perturbed, perfectly reflecting, infinite plane (which is called a locally rough surface in this paper). We propose a novel integral equation formulation for the direct scattering problem which is defined on a bounded curve (consisting of a bounded part of the infinite plane containing the local perturbation and the lower part of a circle) with two corners. This novel integral equation can be solved efficiently by using the Nystrom method with a graded mesh introduced previously by Kress and is capable of dealing with large wavenumber cases. For the inverse problem, we propose a Newton iteration method to reconstruct the local perturbation of the plane from multiple frequency far-field data, based on the novel integral equation formulation. Numerical examples are carried out to demonstrate that our reconstruction method is stable and accurate even for the case of multiple-scale profiles.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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