摘要
为了解决激光通信系统噪声干扰影响系统性能的问题,论文研究了大气湍流信道的数学模型。根据有限孔径接收光强起伏理论,分别建立基于光强起伏考虑大气湍流影响和无湍流影响的信噪比模型,给出湍流条件下激光通信系统误码率计算模型。通过计算与分析,结果表明当折射率结构常数越大湍流越强,信噪比增加并趋于饱和的速度越快;接收器孔径直径越小,无湍流时的信噪比和湍流情况的信噪比的增加速度越小,光强起伏和接收端接收器孔径是引起系大气湍流光通信系统性能波动的主要因素。该模型可有效评估大气湍流条件下激光通信系统误码率性能,并为相关理论研究提供参考。
In order to solve the problem that the noise interference of laser communication system affects system performance,the mathematical model of atmospheric turbulence channel is studied in this paper.Based on the theory of laser intensity fluctuation in finite aperture,a signal-to-noise ratio model based on laser intensity fluctuation considering the influence of atmospheric turbulence and no turbulence are established respectively,and the BER model of laser communication system under turbulent conditions is given.Through calculation and analysis,results show that the turbulence is greater when the refractive index structure constant is larger,and the faster the signal-to-noise ratio increases and tends to saturate;the smaller the aperture diameter of the receiver,the less the signal-to-noise ratio when the turbulence is increased.The laser intensity fluctuation and receiver aperture are the main factors that cause the fluctuation of laser communication system under the atmospheric turbulence.The model can effectively evaluate the BER performance under the condition of atmospheric turbulence,and provide reference for relevant theoretical research.
作者
刘小虎
彭天亮
Liu Xiaohu;Peng Tianliang(Xi’an Peihua University,Xi’an 710032,China;Key Laboratory of Water Information Synergy Perception and Intelligent Processing in Jiangxi Province,Nanchang 330099,China)
出处
《国外电子测量技术》
2019年第3期40-44,共5页
Foreign Electronic Measurement Technology
基金
西安培华学院校级科研项目(PHKT18017)资助
江西省重点实验室开发基金项目(2016WICSIP027)
国家自然基金项目(61701215)资助
关键词
激光通信
大气湍流
SNR
误码率
laser communication
atmospheric turbulence
SNR
BER
