Journal of Shanghai University(Natural Science Edition) ›› 2017, Vol. 23 ›› Issue (4): 501-509.doi: 10.12066/j.issn.1007-2861.1715

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Modeling atmospheric refractive index structure constant of microwave in horizontal airflow

CANG Lei1,2, ZHAO Hengkai1,2, ZHENG Guoxin1,2   

  1. 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

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