Variable antennas positions solution to reduce pointing errors due to wind speed and temperature coupled effects during free space optical link using matrix Rician pointing error model

IF 0.7 4区 物理与天体物理 Q4 OPTICS Optica Applicata Pub Date : 2023-01-01 DOI:10.37190/oa230305
Michel Teuma Mbezi, Samuel Eke, Idelette Hermine Judith Som, Ruben Martin Mouangue
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Abstract

Pointing errors (PE) during free space optical (FSO) transmission can be caused by laser beam wander due to thermal and wind dynamic instability. The aim of this work is to study the coupled effects of temperature and wind speed on PE using matrix Rician pointing error (MRPE) model; then show how variable antennas height can reduce PE due to wind speed and temperature coupled effects. To achieve this purposes, average PE expression was established using MRPE model. Then considering a Gaussian beam wave and Monin–Obukhov similarity functions for the structure parameters of temperature, explicit relationship was established between average PE, temperature and wind speed. It comes out of this study that under dynamic turbulence, one can appropriately modify temperature to reduce PE due to dynamic instability and reciprocally. Depending on turbulence large cells or frozen turbulence eddies distribution, PE can be reduced by appropriately modified antennas height or the distance between transmitter and receiver. That is why this work suggests to install variable or dynamic antennas (rather than fixed ones) which could intelligently modify its positions according to laser beam wander created by atmospheric turbulence.
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针对自由空间光链路中由于风速和温度耦合影响而产生的指向误差,提出了一种采用矩阵式径向指向误差模型的变天线定位方案
自由空间光(FSO)传输过程中的指向误差(PE)是由热动力和风动力不稳定引起的激光束漂移引起的。本文利用矩阵指向误差(MRPE)模型研究了温度和风速对PE的耦合影响;然后展示由于风速和温度耦合效应,可变天线高度如何降低PE。为此,采用MRPE模型建立PE平均表达量。然后考虑温度结构参数的高斯波束波和Monin-Obukhov相似函数,建立了平均PE、温度和风速之间的显式关系。研究结果表明,在动态湍流条件下,可以通过适当调节温度来降低动态不稳定性导致的PE。根据湍流大单元或冰冻湍流涡旋的分布情况,可以适当调整天线高度或收发距离来降低PE。这就是为什么这项工作建议安装可变或动态天线(而不是固定天线),这些天线可以根据大气湍流产生的激光束漂移智能地调整其位置。
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来源期刊
Optica Applicata
Optica Applicata 物理-光学
CiteScore
1.00
自引率
16.70%
发文量
21
审稿时长
4 months
期刊介绍: Acoustooptics, atmospheric and ocean optics, atomic and molecular optics, coherence and statistical optics, biooptics, colorimetry, diffraction and gratings, ellipsometry and polarimetry, fiber optics and optical communication, Fourier optics, holography, integrated optics, lasers and their applications, light detectors, light and electron beams, light sources, liquid crystals, medical optics, metamaterials, microoptics, nonlinear optics, optical and electron microscopy, optical computing, optical design and fabrication, optical imaging, optical instrumentation, optical materials, optical measurements, optical modulation, optical properties of solids and thin films, optical sensing, optical systems and their elements, optical trapping, optometry, photoelasticity, photonic crystals, photonic crystal fibers, photonic devices, physical optics, quantum optics, slow and fast light, spectroscopy, storage and processing of optical information, ultrafast optics.
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