多層非均勻介質之微波散射模擬分析

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姓名

吳怡瑾( Yi-Chin Wu) 查詢紙本館藏

畢業系所

太空科學研究所

論文名稱

多層非均勻介質之微波散射模擬分析
(Numerical Simulation of Scattering from Inhomogeneous Layered Medium)

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摘要(中)

在遙測方面的應用，我們首先要考慮到的是電磁波對於偵測物的散射現象。電磁波的表面散射現象相當複雜，我們除了必須考慮粗糙表面所產生的散射之外，還必須考慮到介質的不均勻產生的介電係數變化。在此，我們使用多層介質(N-multi-Layered Medium)來簡化數學模式，假設不均勻介質為分層的均勻介質，並且利用數值方法(numerical methods)使問題簡化，進一步模擬出格林函數(Green’s Function)，用以求得散射場之場強。
本研究結果顯示，多層的非均勻介質所產生的散射效應是不能忽略不計的，並且和電磁波之極化具有相關性。

摘要(英)

In wave propagation, a common problem occurs in describing the scattering at the interface between two media, such as the interfaces between air and ocean, air and soil air, and vegetation cover, etc. To some extent, all the interfaces will have some degree of roughness, which will complicate the scattering. The scattering of electromagnetic waves by lossy dielectric rough surfaces has broad applications because of the similarities to natural media. We use multi-layered media to simplify the problems about dielectric rough surfaces and simulate the Green Function by numerical method to compute the scattering field.
The simulations show that the effect of the inhomogeneous layered medium is non-negligible and is polarization dependent.

關鍵字(中)

★ 微波
★ 多層
★ 散射
★ 粗糙面
★ 非均勻

關鍵字(英)

★ microwave
★ layer
★ scattering
★ rough surface
★ i

論文目次

Abstract ………………………………………………………………IV
TABLE OF CONTENTS………………………………………………V
LIST OF FIGURES ……………………………………………………VII
LIST OF TABLE ………………………………………………………X
CHAPTER
1 Introduction
1.1Introduction ………………………………………………………………….. 1
1.2Objectives ……………………………………………………………………. 2
1.3Organization …………………………………………………………………. 4
2 Scattering from Rough Surface
2.1 Background …………………………………………………………………. 5
2.2 Analytic Theory …………………………………………………………….. 6
2.3 Numerical Methods …………………………………………………………. 8
3 Numerical Simulations of Scattering from Inhomogeneous Dielectric Rough Surfaces Based on Physics-Based Two-Grid Method
3.1 Introduction ………………………………………………………………… 14
3.2 Formulation ………………………………………………………………… 15
3.3 The Physics-Based Two-Grid Method ……………………………………… 21
3.4 Inclusion of Reflected Part of the Dyadic Green’s Function ……………….. 28
4 Scattering from Layered Medium
4.1 Reflection from Layer Medium …………………………………………….. 36
4.1.1 Reflection Coefficient for TE and TM Waves ………………………... 36
4.1.2 Computations of The Reflection Coefficient of Sea Ice ……………… 37
4.1.3 Computations of The Reflection Coefficient of Two-Layer Soil ……... 42
4.1.4 Computations of The Reflection Coefficient of Two-Layer Sea Ice ……46
4.2 Computations of the and …………………………………….. 52
4.2.1 Sea Ice …………………………………………………………………... 60
4.2.2 Soil ……………………………………………………………………… 64
4.2.3 Discussions ……………………………………………………………....72
4.3 Numerical Results …………………………………………………………….. 75
5 Conclussions…………………………………………………………………...…80
References…………………………………………………………………………..81

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指導教授

陳錕山(Kun-Shan Chen)

審核日期

2001-6-21

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