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Study on electromagnetic scattering of cylinders buried in a half space with random rough surfaces of finite/infinite length.

机译：研究埋入半空间的圆柱体的电磁散射，该空间具有有限/无限长的随机粗糙表面。

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摘要

Analysis of electromagnetic scattering of buried objects is a subject of great interest due to its practical importance in both military and civil applications, such as subsurface investigation and target detection. In reality, the earth is of layered structure of random rough interfaces, which leads to a greatly increased complexity of the analysis. However, it is necessary to incorporate the nature of random rough surface and the layered structure because they both have substantial impact on the scattered signature and hence affect the study of inverse scattering and detection of buried objects. In this dissertation, a Monte-Carlo multidomain pseudospectral time domain (MPSTD) method is developed for investigating the scattering from cylinders buried below a random rough surface separating two half spaces under various conditions. As a prelude, the formulation of multidomain PSTD algorithm is presented. Then, this formulation is extended and combined with the Monte-Carlo approach to analyze the scattering of an object buried below a random rough surface of finite length. In the analysis, special attention is paid to the treatments of the random rough surface including its profile generation, matching with CGL points, and subdomain patching. Next, the scattering of a cylinder buried below a random rough surface of infinite length is studied and a two-step computation model based on the Monte-Carlo MPSTD method is developed. Further, in order to better simulate the real situation, the analysis is then extended to study the scattering from one or more cylinders embedded in a layered half space with random rough surfaces. Finally, a near-zone field to far-zone field transformation technique is developed and presented. Sample numerical results under different conditions, involving random rough surface of various roughness, lower half space with different permittivities, and cylinders of circular and rectangular shapes are presented, validated, and analyzed. Throughout this research, a numerical technique based on Monte-Carlo method and MPSTD approach has been developed and validated for investigating cylinders buried in a half space with random rough surfaces. It is observed that the roughness of the random rough surface and the electromagnetic properties of the lower half space can significantly affect the scattered signature of the buried object.
机译：由于埋入物体的电磁散射分析在军事和民用应用（例如地下勘测和目标检测）中都具有实际重要性，因此引起人们极大的兴趣。实际上，地球是随机粗糙界面的分层结构，这导致分析的复杂性大大增加。但是，必须结合随机粗糙表面和分层结构的性质，因为它们都对散射特征产生实质性影响，因此影响了反向散射的研究和掩埋物体的检测。本文提出了一种蒙特卡洛多域伪谱时域方法，用于研究在各种条件下掩埋在随机粗糙表面下的圆柱的散射，该粗糙表面将两个半空间隔开。作为序言，提出了多域PSTD算法的提出。然后，将该公式扩展并与蒙特卡洛方法结合起来，以分析掩埋在有限长度的随机粗糙表面下的物体的散射。在分析中，要特别注意随机粗糙表面的处理，包括其轮廓生成，与CGL点匹配以及子域修补。接下来，研究了埋在无限长的随机粗糙表面下的圆柱体的散射，并建立了基于蒙特卡洛MPSTD方法的两步计算模型。此外，为了更好地模拟实际情况，然后扩展分析以研究来自一个或多个圆柱体的散射，这些圆柱体嵌入具有随机粗糙表面的分层半空间中。最后，提出并提出了一种近地场到远地场的转换技术。给出，验证和分析了在不同条件下的样品数值结果，这些结果包括各种粗糙度的随机粗糙表面，具有不同介电常数的下半空间以及圆形和矩形圆柱体。在整个研究过程中，已经开发了一种基于蒙特卡洛方法和MPSTD方法的数值技术，并经过了验证，可用于研究被埋在具有随机粗糙表面的半空间中的圆柱体。可以看出，随机粗糙表面的粗糙度和下半部空间的电磁特性会显着影响掩埋物体的散射特征。

著录项

  • 作者

    Dai, Yueyang.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Engineering Electronics and Electrical.;Physics Electricity and Magnetism.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 112 p.
  • 总页数 112
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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