大气湍流对激光通信系统传输特性的数学模型构建  

Mathematical model of atmospheric turbulence on transmission characteristics of laser communication system

作　　者：黄方方 熊伟 HUANG Fangfang;XIONG Wei(Jiangxi Institute of Engineering,Xinyu Jiangxi 338029,China)

机构地区：[1]江西工程学院

出　　处：《激光杂志》2019年第11期123-126,共4页Laser Journal

基　　金：江西省教育厅科学技术研究项目(No.161289)

摘　　要：掌握大气湍流对激光通信系统传输特性影响有利于提高系统探测精度,因此,构建大气湍流对激光通信系统传输特性的数学模型。用Rytov方差表征强、弱湍流下闪烁方差,以此为前提分析大气湍流效应强、弱影响下光强起伏情况;在此基础上,以激光通信系统的发射孔径间距、接收孔径大小、传输距离以及激光束数量为参量,以光束间相干性为限制条件,构建大气湍流对激光通信系统传输特性的数学模型。根据所构建模型分析可知:Rytov方差不断增加,光束光强起伏程度不断降低。经验证,所构建模型模拟的激光光强概率排列曲线、光强概率排列趋势与实际情况一致,所构建模型在分析大气湍流激光通信系统传输特性方面可靠程度高。Mastering the influence of atmospheric turbulence on the transmission characteristics of laser communi-cation system is conducive to improving the detection accuracy of the system.Therefore,a mathematical model of atmos-pheric turbulence on the transmission characteristics of laser communication system is constructed.Using Rytov vari-ance to characterize the scintillation variance under strong and weak turbulence,the fluctuation of light intensity under strong and weak atmospheric turbulence effect is analyzed.Based on this,the mathematical model of transmission char-acteristics of laser communication system are constructed by taking the parameters such as emitter aperture spacing,the receiving aperture size,the transmission distance and the number of laser beams,and the constraints of coherence be-tween beams.According to the model analysis,it can be seen that the Rytov variance increases and the intensity fluctu-ation decreases.The simulation results show that the probability alignment curve and the intensity alignment trend are consistent with the actual situation,and the model is reliable in analyzing the propagation characteristics of atmospheric turbulent laser communication system.

关 键 词：大气湍流 激光通信系统 光强起伏 传输特性 相干性 

分 类 号：TN292[电子电信—物理电子学]