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大气波导环境中折射率指数模式的统计特征

发表时间:2008-04-15  浏览量:1811  下载量:816
全部作者: 刘成国,王元,吴迅英
作者单位: 武汉理工大学理学院;中国气象局国家气象信息中心
摘 要: 本文详细说明了大气波导环境下空气折射率指数剖面的建模方法,并根据地面上1 km大气折射率的值、折射率平均梯度两个特征参数及它们与地面空气折射率的相关性,分析大气波导环境下折射率剖面的统计特征。对上世纪70年代中5年内波导出现的数据和1990年12月份的全部数据的研究表明:贴地波导出现时,它们的值及其和Ns指数关系的常数分别是110.6、0.002 9和-8.6、0.004 7,地面上1 km处的折射率N1k及地面上第一公里内的平均折射率梯度dN1和地面折射率Ns的相关性比没有波导出现的情况好;而这两者相比,前者的结果又比后者好。
关 键 词: 无线电物理;无线电气象;空气折射率;大气波导;电波传播
Title: Statistical characteristics of the exponential refractivity profiles under atmospheric duct environment
Author: LIU Chengguo, WANG Yuan, WU Xunying
Organization: College of Science, Wuhan University of Technology;National Meteorological Information Center, China Meteorological Administration
Abstract: The characteristics of exponential atmospheric refractivity profile under atmospheric duct are investigated with air refractivity at height of 1 km and the average gradient of refractivity 1 km above ground as the characteristic parameters, their correlation with surface refractivity included also. The methods of modeling and statistic are elaborated; the results depicted in detail are applicable. Based on the data of 5 years in 1970s with duct present and those of December 1990, refractivity at height of 1 km, the average gradient of refractivity and surface refractivity are obtained by regression of the refractivity profiles to exponential models. And it is found that the constants in the exponential relation of refractivity of 1 km above ground and the mean vertical refractivity gradient in the first kilometer height with the surface value of refractivity are 110.6, 0.002 9 and -8.6, 0.004 7 respectively according the data of the 1970s' surface ducts, and the correlations under duct environment are better than under other environment.
Key words: radio physics; radio meteorology; atmospheric refractivity; atmospheric duct; radio wave propagation
发表期数: 2008年8月第7期
引用格式: 刘成国,王元,吴迅英. 大气波导环境中折射率指数模式的统计特征[J]. 中国科技论文在线精品论文,2008,1(7):767-772.
 
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