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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Long-range propagation through inhomogeneous turbulent atmosphere: analysis beyond phase screens
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Long-range propagation through inhomogeneous turbulent atmosphere: analysis beyond phase screens

机译：通过非均匀湍流大气的远程传播：超越相屏幕的分析

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Many applications rely on the propagation of electromagnetic waves through extended regions of the atmosphere over which the refractive index can vary in a complex manner. Gradients and curvature of the mean refractive index profile result in ray bending and the associated phenomena of mirages, atmospheric lensing, and wave trapping in parabolic cavities. Stochastic refractive index fluctuations due to turbulence cause a random displacement of the trajectory and give rise to the wander, or spot dancing, of a propagating optical beam. In this paper we model these features of the refractive index profile locally and describe propagation through the corresponding regions. We derive formulas for the mean ray path that capture the effects of both atmospheric turbulence and variations in the mean refractive index profile, including the non-paraxial effects associated with the bending of the guiding ray path. We also give formulas for the mean-squared transverse displacement of a ray from the mean trajectory, which can provide for example an estimate of the magnitude of the beam wander due to turbulence.
机译：许多应用依赖于电磁波的传播，通过大气的延伸区域，折射率可以以复杂的方式变化。平均折射率轮廓的梯度和曲率导致射线弯曲和抛物面腔内的摩托，大气镜头和波浪捕获的相关现象。由于湍流引起的随机折射率波动导致轨迹的随机位移，并导致传播光学束的漫游或跳舞。在本文中，我们在本地折射率轮廓的这些特征模拟了这些特征，并通过相应的区域描述传播。我们为平均射线路径推导出捕获大气湍流和变化的平均射线曲线的效果，包括与引导射线路径的弯曲相关的非横向效应。我们还提供来自平均轨迹的射线的平均平均横向位移的公式，这可以提供例如由于湍流引起的梁漂移的大小的估计。

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