Anisotropic Non-Kolmogorov Turbulence Spectrum with Anisotropic Tilt Angle

Anisotropic Non-Kolmogorov Turbulence Spectrum with Anisotropic Tilt Angle
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具有各向异性倾斜角的各向异性非柯尔莫哥洛夫湍流谱

DOI:
10.3390/photonics8110521
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发表时间:
2021-11
期刊:
影响因子:
2.4
通讯作者:
Zhai Chao
Zhai Chao
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhai Chao

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随着对大气湍流研究的深入,学者们认识到湍流单体的各向异性不应被忽视。各向异性非Kolmogorov湍流模型能较好地表征大气湍流的实际情况。然而,Wang等人和Beason等人最近的实验结果表明,湍流单元具有各向异性的倾斜角,即,湍流单元的长轴可以不与地面水平,而是与地面成一定角度。在本文中,我们推导出各向异性的非Kolmogorov湍流谱的水平和卫星链路的各向异性倾斜角。利用这些谱,在弱起伏条件下,导出了水平链路和卫星链路闪烁指数的解析表达式。计算结果表明,水平链路和卫星链路的闪烁指数随各向异性倾角和方位角的变化而变化。因此,各向异性倾角在水平链路和卫星链路中是不可缺少的。
With the in-depth study of atmospheric turbulence, scholars have identified that the anisotropy of turbulence cells should not be forgotten. The anisotropic non-Kolmogorov turbulence model can better characterize the actual situation of atmospheric turbulence. However, the results of recent experiments by Wang et al. and Beason et al. demonstrate that the turbulence cell has an anisotropic tilt angle, i.e., the long axis of turbulence cell may not be horizontal to the ground but has a certain angle with the ground. In this paper, we derive the anisotropic non-Kolmogorov turbulence spectra for the horizontal and satellite links with anisotropic tilt angle. Then by use of these spectra, the analytical expressions of scintillation index in the horizontal and satellite links are derived for the weak fluctuation condition. The calculation results display that the scintillation index for the horizontal and satellite links vary with the changes of anisotropic tilt angle and azimuth angle. Therefore, the anisotropic tilt angle is indispensable in the horizontal and satellite links.
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