Model and Analysis of Atmospheric Turbulence Index Structure Parameter in the Single-shaft Tunnel of Rail Transit Environment
ZHAO Hengkai①② FU Xintao①
①(School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China) ②(Key Laboratory of Specialty Fiber Optics and Optical Access Network, Shanghai University, Shanghai 200072, China)
The change of the atmospheric turbulence affects the transmission of microwave. In order to study the impact of turbulence on the microwave transmission in rail transit tunnel environment, this paper combines the motion characteristics of the piston wind with the calculation method of atmospheric refractive index structure parameter. With investigation into the influences of tunnel environmental temperature, length of tunnel, blockage ratio, and piston wind speed on the atmospheric refractive index structure parameter, an atmospheric refractive index structure parameter model is established in the single-shaft rail transit tunnel environment. In this paper, the distribution of the atmospheric refractive index structure constant in rail transit tunnel environment is analyzed, and the change of atmospheric turbulence refractive index structure parameter in case of the train through the single-shaft tunnel with that of no single-shaft tunnel is compared based on the actual tunnel temperature scene. The model provides a theoretical reference for the study of radio refractive index structure constant in rail transit tunnel environment.
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ZHAO Hengkai, FU Xintao. Model and Analysis of Atmospheric Turbulence Index Structure Parameter in the Single-shaft Tunnel of Rail Transit Environment. JEIT, 2017, 39(4): 887-892.
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