收稿日期: 2015-09-02
网络出版日期: 2017-08-30
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
Received date: 2015-09-02
Online published: 2017-08-30
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 . DOI: 10.12066/j.issn.1007-2861.1715
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.
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