| 姚展予,赵柏林,李万彪,朱元竞,杜金林,戴福山. 2000. 大气波导特征分析及其对电磁波传播的影响[J]. 气象学报, 58(5):605-616, doi:10.11676/qxxb2000.062 |
| 大气波导特征分析及其对电磁波传播的影响 |
| THE ANALYSIS ON CHARACTERISTICS OF ATMOSPHERIC DUCT AND ITS EFFECTS ON THE PROPAGATION OF ELECTROMAGNETIC WAVE |
| 投稿时间：1999-09-09 修订日期：1999-11-30 |
| DOI：10.11676/qxxb2000.062 |
| 中文关键词: 大气波导 特征分析 电磁波传播 |
| 英文关键词:Atmospheric duct Characteristic analysis Propagation of electromagnetic wave |
| 基金项目:国家自然科学基金项目(49794030);国家重点科技攻关项目(96-020-01-05) |
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| 中文摘要: |
| 文中在介绍大气折射的基本类型及其存在条件的基础上,阐述了三种类型的大气波导的形成机制,总结并分析了大气波导的几个主要特征,并用西北太平洋云辐射实验的实测资料和西沙海域的气象资料进行了验证,同时试验了蒸发波导高度对大气湿度、气海温差、水平风速变化的敏感性.在分析大气波导对电磁波传播的影响时,推导了可形成波导传播的电磁波最大陷获波长和临界发射仰角,提出了电磁波形成波导传播的4个必要条件,并讨论了大气波导对超短波传播、雷达探测、短波通信等方面的影响。 |
| 英文摘要: |
| On the basis of introducing the basic categories of atmospheric refraction and their existing condition, the forming processes of three kinds of atmospheric duct are expounded.Several main characteristics of atmospheric duct are summarized and analyzed, and field sounding data from the Western North-Pacific Cloud-radiation Experiment (WENPEX) and meteorological data around the Xisha sea area are used to validate these characteristics. Meanwhile the sensitivities of the evaporation duct height to the variations of atmospheric humidity, the air-sea temperature difference, and horizontal wind speed are examined. With the analysis of the effect of atmospheric duct on the propagation of electromagnetic wave, the maximum trapped-wavelength and the critical emitting angle of elevation for electromagnetic wave which can form sduct propagation are derived. At the same time the four kinds of necessary condition for electromagnetic wave to form duct propagation are brought forward. The effects of atmospheric duct on ultrashort wave propagation, radar observation, short wave communication etc. are also discussed. |
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