编辑: 黑豆奇酷 | 2019-07-10 |
有关教师、同学和其他人员对本文的写作、修订提出过并为我在论文 中加以采纳的意见、 建议, 均已在我的致谢辞中加以说明并深致谢意.
本论文和资料若有不实之处,本人承担一切相关责任. 论文作者: (签字) 时间: 年月日指导教师已阅: (签字) 时间: 年月日摘要 摘要随机粗糙表面以及电大尺寸复杂目标的散射计算,对雷达制导与截获技术、 目标识别与特征提取、浅层地下目标勘探等具有十分重要的研究价值,日趋频繁 的工程应用希望对这些目标的雷达散射截面进行测量或预测.对于超电大尺寸目 标,往往借助缩比测量理论.缩比测量的依据是两个电磁系统必须满足相似性条 件. 本文推导了无耗及有耗电磁系统的缩比条件,并进一步将缩比理论应用于粗 糙表面的散射.对于粗糙表面,模型和原型首先必须在几何上相似,因此,本文 研究了一维、二维粗糙表面和具有 JONSWAP 海谱的二维海面的几何缩比条件, 为基于缩比模型计算粗糙面的散射作了准备工作.为了比较缩比模型和原型的散 射特性,利用矩量法计算了一维、二维导体高斯粗糙面的散射截面.数值结果表 明,本文给出的粗糙表面几何缩比条件是有效的. 关键词:缩比 粗糙面 矩量法 电磁散射 ABSTRACT ABSTRACT Research on electromagnetic scattering from electrical large target and randomly rough surface has bean attracting more and more attention in recent years, due to its extensive applications to airborne radar observation, target identification and acquisition, ground-penetrating radar, etc. For the extremely large target, an alternative approach is to use scale model. The basis of scale measurement is that the two electromagnetic systems of model and prototype must satisfy the similar conditions. The basis of scale measurement is that the two electromagnetic systems of model and prototype must satisfy the similar conditions. This paper firstly derives the scale conditions for lossless and lossy electromagnetic system. For further study, the scale theory is applied to the scattering of rough surface. To the rough surface, the scale model must be similar to prototype in geometry. Therefore, the scale conditions for the geometry of 1-D, 2-D rough surface and sea rough surface with a JONSWAP spectrum are also studied, which prepare for calculating the scattering of rough surface based on the scale models. To compare the scattering characteristics of model and prototype, the RCS of 1-D, 2-D lossless Gaussian rough surface are calculated according to the method of moments (MoM). The numerical results show that the scale conditions for the geometry of rough surface presented in this paper are valid. Keywords: scale rough surface method of moments EM scattering 目录 i 目录
第一章 绪论.1 1.1 研究背景及意义.1 1.2 国内外研究现状.3 1.3 本文的主要内容和结构安排.5
第二章 缩比理论的基本原理.7 2.1 一般缩比理论.7 2.2 无耗电磁系统的缩比条件.9 2.3 有耗电磁系统的缩比条件.9 2.4 数值分析.11 2.5 本章小结.12