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应用科学学报 >

2011 , Vol. 29 >Issue 1: 22 - 26

DOI: https://doi.org/10.3969/j.issn.0255-8297.2011.01.004

通信工程

 大气湍流对星地激光下行链路最大天顶角的影响

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  • 1. 中国科学技术大学电子科学与技术系，合肥230027
    2. 中国科学院上海技术物理研究所，上海200083
李永亮，博士生，研究方向：计算机仿真，E-mail: ylli83@yahoo.cn；王建宇，研究员，博导, 研究方向：光学遥感系统、信息获 取与处理技术，E-mail: jywang@mail.sitp.ac.cn

收稿日期: 2010-10-12

  修回日期: 2010-12-04

  网络出版日期: 2011-01-25

基金资助

中科院知识创新工程三期项目基金(No.KGCX3-SYW-407-03-10)资助

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Effect of Atmospheric Turbulence on Maximal Zenith Angle of Satellite-to-Ground Laser Communication Links

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  • 1. Department of Electronic Science and Technology, University of Science and Technology of China,Hefei 230027, China
    2. Chinese Academy of Sciences, Shanghai Institute of Technical Physics, Shanghai 200083, China

Received date: 2010-10-12

  Revised date: 2010-12-04

  Online published: 2011-01-25

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摘要

 针对星地激光通信下行链路，提出最大天顶角的概念，并给出在大气湍流影响下最大天顶角模型的建立方法. 文中以采用OOK调制、APD探测器的链路为例，基于gamma-gamma光强起伏概率密度函数、Webb-Gaussian APD输出模型以及Hufnagel-Valley湍流强度轮廓线，推导了下行链路最大天顶角、近地面湍流强度、误码率三者之间的关系. 用数值仿真得到信号光功率为2W的链路中最大天顶角分别与近地面湍流强度、误码率的关系曲线，该结果表明链路可容忍的误码率越大则最大天顶角越大，而近地面湍流强度越大则最大天顶角越小. 最后，该文利用非线性拟合方法拟合了最大天顶角关于误码率和地面湍流强度的经验模型.

关键词： 激光通信；大气湍流；最大天顶角；误码率；经验模型

本文引用格式

李永亮1， 王建宇1;2， 徐睿1， 林日钊1， 傅忠谦1 .  大气湍流对星地激光下行链路最大天顶角的影响[J]. 应用科学学报, 2011 , 29(1) : 22 -26 . DOI: 10.3969/j.issn.0255-8297.2011.01.004

Abstract

Abstract: A concept of "maximal zenith angle" is proposed for satellite-to-ground laser communication links. A method for building the maximal zenith angle model is presented. We consider links using on-off-keying (OOK) modulation and avalanche photodiode detector (APD). Relationship among the maximal zenith angel, the nominal value of atmosphere turbulent intensity, and the bit error rate (BER) is obtained. This is done based on gamma-gamma (GG) probability density function (PDF), Web-Gaussian approximation of APD, and the Hufnagel-Valley model of the atmosphere turbulent intensity. With the laser signal power set at 2W, the simulation results show that the maximal zenith angel is clearly decreased with the nominal value
of atmosphere turbulent intensity, and increased with BER. A empirical model of maximal zenith angel is obtained using nonlinear curve fitting.

Key words：  laser communication, atmospheric turbulence, maximal zenith angle, bit error rate, empirical model

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