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论文:2012,Vol:30,Issue(1):1-5 |
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引用本文： |
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胡楚锋, 周洲, 李南京, 张麟兮, 许家栋. 森林植被衰减系数极化特征研究[J]. 西北工业大学 |
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Hu Chufeng, Zhou Zhou, Li Nanjing, Zhang Linxi, Xu Jiadong. Exploring Attenuation Coefficients of Forest Vegetation with Broadband Backscattering Measurement System[J]. Northwestern polytechnical university |
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| 森林植被衰减系数极化特征研究 |
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| 胡楚锋1,2, 周洲1, 李南京1, 张麟兮1, 许家栋1 |
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1. 西北工业大学 无人机特种技术重点实验室,陕西 西安 710065;
2. 西北工业大学 航空学院,陕西 西安 710072 |
| 摘要: |
| 采用室内宽带极化测量系统获得了小场景森林植被3～10GHz高精度多极化的频域数据,通过时域响应定量推导了极化衰减差异与回波电平的数学关系,并结合植被的形态特征分析了极化衰减特征随频率的变化规律。结果表明通过不同极化的衰减系数差异能够刻画森林植被结构的形态分布特征。当频率较低时,森林植被的结构分布体现有向性,随着频率的升高,主要的回波来自于冠层,植被结构呈现随机性分布特点。 |
| 关键词:
森林植被
衰减系数
极化
时域响应
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| Exploring Attenuation Coefficients of Forest Vegetation with Broadband Backscattering Measurement System |
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| Hu Chufeng1,2, Zhou Zhou1, Li Nanjing1, Zhang Linxi1, Xu Jiadong1 |
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1. Science and Technology on UAV Laboratory,Northwestern Polytechnical University,Xi'an 710072,China;
2. College of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China |
| Abstract: |
| The introduction of the full paper reviews a number of papers in the open literature and then proposes u-sing the indoor broadband backscattering measurement system to obtain the accurate and multi-polarized 3～10 GHzfrequency-domain data of a small-scenario forest.Sections 1,2 and 3 explain our exploration.Their core consistsof: (1) we establish the model of attenuation coefficient of forest vegetation and quantitatively derive the mathemati-cal relations between the polarized attenuation coefficients of the forest vegetation and those of its echo by using time-domain analysis; (2) we establish a broadband backscattering measurement system to analyze the variation of polar-ized attenuation characteristics with frequency by means of the morphological characteristics of forest vegetation.Theexperimental results,given in Figs 3 and 4, and their analysis show preliminarily that: (1) the various polarized at-tenuation coefficients can describe the morphological characteristics of forest vegetation; (2) when the frequency ofthe broadband backscattering measurement system is low,the structural distribution of forest vegetation has its origi-nal orientation; as the frequency increases,the echo of forest vegetation mainly comes from canopy and its structurehas random distribution. |
| Key words:
algorithms
analysis
attenuation
backscattering
bandwidth
calculations
characterization
electro-magnetic field measurement
experiments
frequencies
frequency domain analysis
measurements
models
morphology
polarization
schematic diagrams
structure(composition)
targets
time domainanalysis
transmissions
vegetation;attenuation coefficient
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| 收稿日期: 2011-04-28
修回日期:
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| DOI: |
| 基金项目: 中国博士后科学基金(2011MS01474)资助 |
| 通讯作者:
Email： |
| 作者简介: 胡楚锋(1982-),西北工业大学博士后,主要从事微波遥感、散射测量与成像技术研究。
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参考文献: |
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