| 植被电磁散射的半空间模型研究 |
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| 引用本文： | 杨同敏,谢拥军,王鹏,杨锐.植被电磁散射的半空间模型研究[J].地球物理学报,2007,50(2):605-610. |
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| 作者姓名： | 杨同敏 谢拥军 王鹏 杨锐 |
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| 作者单位： | 西安电子科技大学天线与微波技术国家重点实验室，西安 710071 |
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| 基金项目： | 教育部新世纪优秀人才支持计划(NCET-04-0950)资助 |
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| 摘 要： | 本文给出了地面植被电磁散射的半空间模型研究方法.在以往的相关文献中，均采用自由空间格林函数求解单个叶片散射体的散射场，本文利用半空间并矢格林函数求出了单个散射体的散射场，然后运用Monte Carlo方法模拟生成地面植被层，得到了在半空间下植被层的电磁散射特性，计算出了单、双站雷达散射截面，并与自由空间下的散射场做了相互对比.结果表明，在半空间格林函数下得到的散射场更为适用于描述地面植被的电磁散射特性.
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| 关 键 词： | 半空间格林函数 Monte Carlo方法 植被电磁散射 随机介质 雷达散射截面 |
| 文章编号： | 0001-5733（2007）02-0605-06 |
| 收稿时间： | 2006-1-20 |
| 修稿时间： | 2006-01-20 |
Characteristics of long-term climate change in Beijing with detrended fluctuation analysis |
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| YANG Tong-Min,XIE Yong-Jun,WANG Peng,YANG Rui.Characteristics of long-term climate change in Beijing with detrended fluctuation analysis[J].Chinese Journal of Geophysics,2007,50(2):605-610. |
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| Authors: | YANG Tong-Min XIE Yong-Jun WANG Peng YANG Rui |
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| Institution: | National Key Laboratory of Antennas and Microwave Technology, Xidian University, Xi'an 710071, China |
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| Abstract: | Electromagnetic scattering characteristics of ground vegetation in a half-space model are studied. Instead of free space Green's functions used in previous literatures, half-space Green's functions are applied here to solve the scattered fields of a single scatter. The Monte-Carlo method is employed to generate the vegetation over the ground in order to obtain the electromagnetic scattering characteristics of the ground vegetation. Backscattering and bistatic radar cross sections are also calculated. Comparing with the scattered fields obtained by free space Green's functions, it shows that the scattered fields obtained by half-space Green's functions are more suitable to describe the electromagnetic scattering characteristics of the ground vegetation. |
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| Keywords: | Half-space Green's functions Monte-Carlo method Scattering from vegetation Random media Radar cross section |
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