利用光束测量估算湍流介质的时变折射率:一种数据同化方法。

IF 1.4 3区 物理与天体物理 Q3 OPTICS
Anjali Nair, Qin Li, Samuel N Stechmann
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引用次数: 0

摘要

在自由空间光通信等应用中,信号通常要在湍流介质中传播后才能恢复。在这种情况下,通常假设已知的湍流介质信息有限,如空间和时间平均统计量(如均方根),但不知道空间变化的状态。如果湍流介质的状态可以用空间变化和时间演变来描述,则有助于获得更多信息。在此,我们建议研究数据同化技术在这方面的应用。计算设置采用了准轴波方程,并使用扩展卡尔曼滤波器利用强度测量进行数据同化。为了降低计算成本,湍流介质的演变被模拟为一个随机过程。根据过去的一些研究,该过程只有少量傅立叶波长的空间变化。结果表明,在许多情况下,介质的空间和时间变化都得到了准确的恢复。在某些情况下,某些时间窗口的恢复误差较大。最后,我们讨论了空间变化信息在帮助恢复传输信号或光束源方面的潜在用途。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estimating the time-evolving refractivity of a turbulent medium using optical beam measurements: a data assimilation approach.

In applications such as free-space optical communication, a signal is often recovered after propagation through a turbulent medium. In this setting, it is common to assume that limited information is known about the turbulent medium, such as a space- and time-averaged statistic (e.g., root-mean-square), but without information about the state of the spatial variations. It could be helpful to gain more information if the state of the turbulent medium can be characterized with the spatial variations and evolution in time described. Here, we propose to investigate the use of data assimilation techniques for this purpose. A computational setting is used with the paraxial wave equation, and the extended Kalman filter is used to conduct data assimilation using intensity measurements. To reduce computational cost, the evolution of the turbulent medium is modeled as a stochastic process. Following some past studies, the process has only a small number of Fourier wavelengths for spatial variations. The results show that the spatial and temporal variations of the medium are recovered accurately in many cases. In some time windows in some cases, the error is large for the recovery. Finally, we discuss the potential use of the spatial variation information for aiding the recovery of the transmitted signal or beam source.

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来源期刊
CiteScore
3.40
自引率
10.50%
发文量
417
审稿时长
3 months
期刊介绍: The Journal of the Optical Society of America A (JOSA A) is devoted to developments in any field of classical optics, image science, and vision. JOSA A includes original peer-reviewed papers on such topics as: * Atmospheric optics * Clinical vision * Coherence and Statistical Optics * Color * Diffraction and gratings * Image processing * Machine vision * Physiological optics * Polarization * Scattering * Signal processing * Thin films * Visual optics Also: j opt soc am a.
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