大气湍流和大气闪烁对激光通信性能的影响分析  

Analysis of the impact of atmospheric turbulence and atmospheric scintillation on the performance of laser communication

作　　者：赵乌吉斯古楞 李延风[1] ZHAO Wujisiguleng;LI Yanfeng(College of Computer Science and Technology,Changchun University of Science and Technology,Changchun 130022,China;College of Artificial Intelligence and Big Data,Hulunbeir University,Inner Mongolia 021008,China)

机构地区：[1]长春理工大学计算机科学与技术学院,长春130022 [2]呼伦贝尔学院人工智能与大数据学院,内蒙古呼伦贝尔021008

出　　处：《激光杂志》2024年第11期164-169,共6页Laser Journal

基　　金：国家自然科学基金(No.62275033);内蒙古自治区高等学校科学研究项目(No.NJZY21224);呼伦贝尔学院科研项(No.2022ZKYB07);呼伦贝尔学院科研项目(No.2022FDYB07);呼伦贝尔学院校企合作项目(No.RH2100000131)。

摘　　要：分析大气湍流和大气闪烁对激光通信性能的影响,最大程度提升激光通信质量。以构建的大气湍流下激光通信信道传输模型为基础,分析大气湍流引起激光通信光束折射率分布不均匀情况导致激光光束光强分布出现涨幅产生的大气闪烁现象,并计算大气光强闪烁指数,结合激光通信系统接收信号瞬时信噪比的概率密度函数,分析大气湍流和大气闪烁对激光通信中断概率、平均误码率、平均信道容量的影响;实验结果显示:降低传输距离和天顶角、增加接收端孔径和平均信噪比可降低大气湍流时大气闪烁对激光通信性能的影响;低阶激光光束面对强大气湍流的光束大气闪烁指数变化更显著,可通过提升激光光束阶级提升激光通信质量;且OAM光束相对于高斯光束可更好地抵抗大气湍流和大气闪烁对激光通信性能产生的影响。Analyze the impact of atmospheric turbulence and atmospheric scintillation on the performance of laser communication,in order to maximize the quality of laser communication.Based on the constructed laser communication channel transmission model under atmospheric turbulence,this paper analyzes the atmospheric scintillation phenomenon caused by the uneven distribution of laser communication beam refractive index caused by atmospheric turbulence,which leads to an increase in laser beam intensity distribution.The atmospheric scintillation index is calculated,and combined with the probability density function of the instantaneous signal-to-noise ratio received by the laser communication system,the impact of atmospheric turbulence and atmospheric scintillation on the probability of laser communication interruption is analyzed The impact of average bit error rate and average channel capacity;The experimental results show that reducing transmission distance and zenith angle,increasing receiver aperture and average signal-to-noise ratio can reduce the impact of atmospheric scintillation on laser communication performance during atmospheric turbulence;The atmospheric scintillation index of low order laser beams changes more significantly when facing strong atmospheric turbulence,and the quality of laser communication can be improved by improving the order of laser beams;Moreover,OAM beams can better resist the impact of atmospheric turbulence and scintillation on laser communication performance compared to Gaussian beams.

关 键 词：大气湍流 大气闪烁 激光通信系统 通信性能 中断概率 激光光速 

分 类 号：TN929.5[电子电信—通信与信息系统]