粗糙金属和介质目标的太赫兹散射特性分析

牟媛; 吴振森; 赵豪; 武光玲

doi:10.12000/JR17094

粗糙金属和介质目标的太赫兹散射特性分析

doi: 10.12000/JR17094

牟媛^1, ,,
吴振森^1,,
赵豪^2,,
武光玲^1,

①.
西安电子科技大学物理与光电工程学院西安 710071
②.
西安电子科技大学电子工程学院西安 710071

基金项目: 国家自然科学基金(61571355)

详细信息

作者简介:
牟　媛(1989–)，女，2011年获得西安电子科技大学学士学位，于2011年在西安电子科技大学物理与光电学院硕博连读，主要从事太赫兹波段介质目标的散射特性方面的研究。E-mail: Mirandamyuan@163.com

吴振森(1946–)，男，教授，博士生导师，1969年7月毕业于西安交通大学数理系，1981年武汉大学空间物理系研究生毕业，获理学硕士学位。主要从事目标与环境的电磁特性和光特性、随机介质和复杂结构的电磁波传播和散射等方面的研究。E-mail: wuzhs@mail.xidian.edu.cn

赵　豪(1994–)，男，2016年获得西安电子科技大学工学学士学位，现于西安电子科技大学电子工程学院攻读硕士学位。主要从事太赫兹频段空间动态目标散射的高性能计算的研究。E-mail: 137611634@qq.com

武光玲(1980–)，女，2004年本科毕业于西安电子科技大学应用物理专业，2007年硕士毕业于西安电子科技大学无线电物理专业，主讲《大学物理》和《大学物理实验》，主要从事目标表面光散射特性研究。E-mail: glwu@mail.xidian.edu.cn

通讯作者:
牟媛 Mirandamyuan@163.com

中图分类号: O436.2
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出版历程
- 收稿日期: 2017-10-30
- 修回日期: 2017-12-13
- 网络出版日期: 2018-02-28

The Terahertz Scattering Analysis of Rough Metallic and Dielectric Targets

Mou Yuan^{1
, ,},
Wu Zhensen^1
,,
Zhao Hao^2
,,
Wu Guangling^1
,

①.
School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
②.
School of Electronic Engineering, Xidian University, Xi’an 710071, China

Funds: The National Natural Science Fundation of China (61571355)

摘要

摘要: 太赫兹频段金属和介质粗糙目标的散射特性是研究太赫兹雷达目标特性的重要基础。当目标表面的主曲率半径远远大于入射波长，且粗糙表面高度起伏与斜率起伏远小于入射波长时，根据稳定相位法和标量近似法，可获得粗糙金属和介质目标的相干散射截面和非相干散射截面。基于稳定相位法，任意目标的相干散射截面可退化为粗糙导体、光滑介质和粗糙介质目标的相干散射。该文分析了电大尺寸光滑金属铝和介质白漆球的散射截面，与Mie理论计算的介质球的散射特性吻合，散射截面误差小于0.1 dBm²。采用朗伯定理，验证了粗糙介质球的太赫兹非相干散射精确解，当目标表面剖分精度越高，非相干散射的计算精度越高。该文数值计算了粗糙介质球的太赫兹相干和非相干散射特性，分析了表面粗糙度和表面材料对散射特性的影响，为电大尺寸空间目标太赫兹散射特性分析提供了理论基础。
- 太赫兹 /
- 相干散射 /
- 非相干散射 /
- 电大尺寸
Abstract: The terahertz scattering characteristics of metallic and dielectric rough targets is important for the investigation of the terahertz radar targets properties. According to the stationary phase theory and scalar approximation, if the radius of curvature at any point of the surface is much larger than the incident wavelength, and the wavelength is also much longer than the surface height function and Root-Mean-Square (RMS) surface slope, the coherent and incoherent scattering Radar Cross Section (RCS) of rough metallic and dielectric targets can be obtained. Based on the stationary phase approximation, the coherent RCS of rough conductors, smooth dielectric targets and rough dielectric targets can be easily deputed. The scattering characteristics of electrically large smooth Al and painted spheres are investigated in this paper, and the calculated RCS are verified by Mie scattering theory, the error is less than 0.1 dBm². Based on lambert theory, it is demonstrated that the incoherent RCS is analyzed with better precision if the rough surfaces are divided into much more facets. In this paper, the coherent and incoherent scattering of rough Al and painted spheres are numerically observed, and the effects of surface roughness and materials are analyzed. The conclusions provide theoretical foundation for the terahertz scattering characteristics of electrically large rough targets.
- Terahertz /
- Coherent /
- Incoherent /
- Electrically large

HTML全文

图 1 粗糙介质目标的散射场

Figure 1. Scattered fields of rough dielectric targets

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图 2 切平面局部示意图

Figure 2. Local schematic diagram of tangent plane

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图 3 光滑球太赫兹散射解的定标

Figure 3. Terahertz scattering calibration of the smooth sphere

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图 4 朗伯球非相干散射定标

Figure 4. Incoherent scattering calibration of Lambert sphere

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图 5 粗糙介质球的双站相干散射截面

Figure 5. Coherentbistatic scattering cross sections of rough dielectric spheres

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图 6 粗糙金属铝球的非相干散射截面随均方根高度的变化

Figure 6. Incoherent scattering cross sections of rough aluminum spheres with different root mean square heights

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图 7 粗糙金属铝球的非相干散射截面随相关长度的变化

Figure 7. Incoherent scattering cross sections of rough aluminum spheres with different correlation lengths

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图 8 粗糙介质白漆球的非相干散射截面随均方根高度的变化

Figure 8. Incoherent scattering cross sections of rough painted spheres with different root mean square heights

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图 9 粗糙介质白漆球的非相干散射截面随相关长度的变化

Figure 9. Incoherent scattering cross sections of rough painted spheres with different correlation lengths

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