二维分步电磁传播方案的离散湍流频谱建模

Victor Darchy, R. Douvenot, Hélène Galiègue, S. Jamme
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引用次数: 1

摘要

多相屏法是紊流介质中电磁传播模拟的常用方法。在这种技术中,湍流相位屏通常是由连续的冯-卡门-柯尔莫哥洛夫闪烁谱产生的。最近的工作导致了基于抛物波方程离散公式的自相干分步小波传播方法的发展。在这种配置下,使用连续光谱是不合适的。本文提出了一种湍流相位屏的自相干生成方法。为此,引入了经典冯-卡门柯尔莫哥洛夫谱的离散公式。最后通过对数振幅方差的计算讨论了模拟湍流的影响,以验证该方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Discrete Turbulent Spectrum Modelling for 2D Split-Step Electromagnetic Propagation Schemes
The multiple phase screen method is widely used for modelling the electromagnetic propagation in a turbulent medium. In this technique, the turbulent phase screens are classically generated from a continuous Von-Karman Kolmogorov scintillation spectrum. Recent works led to the development of an auto-coherent split-step wavelet propagation method based on a discrete formulation of the parabolic wave equation. In this configuration, the use of continuous spectra is no more suitable. In this paper, we propose an auto-coherent generation method of the turbulent phase screens. To do so, a discrete formulation of the classical Von-Karman Kolmogorov spectrum is introduced. The impact of the modelled turbulence is finally discussed through the computation of the log-amplitude variance to validate this approach.
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