水平气流中微波折射率结构常数建模

doi:10.12066/j.issn.1007-2861.1715

上海大学学报(自然科学版) ›› 2017, Vol. 23 ›› Issue (4): 501-509.doi: 10.12066/j.issn.1007-2861.1715

水平气流中微波折射率结构常数建模

仓蕾^1,2, 赵恒凯^1,2, 郑国莘^1,2

1. 上海大学通信与信息工程学院, 上海 200444;
2. 上海大学特种光纤与光接入网省部共建重点实验室, 上海 200072

收稿日期:2015-09-02 出版日期:2017-08-30 发布日期:2017-08-30
通讯作者: 赵恒凯(1968—), 男, 副教授, 博士, 研究方向为无线通信、电波传播等. E-mail: hkzhao@staff.shu.edu.cn
作者简介:赵恒凯(1968—), 男, 副教授, 博士, 研究方向为无线通信、电波传播等. E-mail: hkzhao@staff.shu.edu.cn
基金资助:
国家自然科学基金资助项目(61271061, 61171086); 上海大学创新基金资助项目(SDCX2012064)

Modeling atmospheric refractive index structure constant of microwave in horizontal airflow

CANG Lei^1,2, ZHAO Hengkai^1,2, ZHENG Guoxin^1,2

1. School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China;
2. Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China

Received:2015-09-02 Online:2017-08-30 Published:2017-08-30

摘要/Abstract

摘要：

电磁波在大气中传输时会受到大气湍流的影响, 湍流的强弱可以用折射率结构常数 $\100dpi \inline C_{n}^{2}$ 来表示. 在2.4 GHz 的微波环境下, 重点研究了微波段空气中水汽压对大气折射率结构常数的影响. 温湿度结构常数的计算选择湍流动能(turbulence kinetic energy, TKE) 闭合方案,由耗散率方法求得, 修正了干燥空气的归一化公式, 在水平气流环境中构建了微波折射率结构常数的模型. 结合隧道环境中实测的气象参数, 采用该模型分析实验时的微波折射率结构常数, 得到在2.4 GHz 的微波环境下, 湿度对折射率结构常数的贡献大于温度.

关键词: 水平气流, 水汽压, 微波, 折射率结构常数

Abstract:

Electromagnetic waves propagating in the atmosphere are influenced by atmospheric turbulence. The structure constant of atmospheric refractive index are generally used to describe turbulence intensity. This paper studies effects of the water vapor pressure in air on atmospheric refractive index in the 2.4 GHz microwave band. A turbulence kinetic energy (TKE) closure scheme is chosen and the structure constant of temperate and humidity is calculated with a turbulent dissipation rate. Then the normalization formulas for dry air are revised at the microwave frequency of 2.4 GHz, and a model of the structure constant of atmospheric refractive index is built in the microwave band in a horizontal airflow. In addition, the model is applied to calculate the atmospheric refractive index structure constant of microwave based on the meteorological parameter actually measured in a tunnel environment. The result indicates that humidity has a more obvious effect on refractive index structure constant in the 2.4 GHz microwave band than temperature.

Key words: microwave , horizontal airflow , vapor pressure, refractive index structure constant

仓蕾1,2, 赵恒凯1,2, 郑国莘1,2. 水平气流中微波折射率结构常数建模[J]. 上海大学学报(自然科学版), 2017, 23(4): 501-509.

CANG Lei1,2, ZHAO Hengkai1,2, ZHENG Guoxin1,2. Modeling atmospheric refractive index structure constant of microwave in horizontal airflow[J]. Journal of Shanghai University（Natural Science Edition）, 2017, 23(4): 501-509.

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水平气流中微波折射率结构常数建模

Modeling atmospheric refractive index structure constant of microwave in horizontal airflow

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