激光大气传输特性的数值模拟  

Numerical Simulation of Laser Propagation Through Atmospheric Turbulence

作　　者：于继平[1] 齐文宗[1] 郭春凤[1] 王德飞[1] 

机构地区：[1]四川大学电子信息学院,四川成都610064

出　　处：《激光与红外》2008年第6期523-527,共5页Laser & Infrared

摘　　要：介绍了激光信号通过大气时的湍流谱模型,分析了考虑湍流内尺度条件下激光在大气中传输时的光强闪烁效应和光束展宽效应。探讨了基于修正Rytov方法的光强闪烁理论,主要是考虑湍流内尺度效应的条件下湍流内尺度、传输激光的波长以及大气结构常数对光强闪烁的影响。用MATLAB对其影响进行了数值模拟,并对结果进行了具体分析。结果表明:湍流内尺度对激光大气水平传输过程中的光强闪烁效应具有重要的影响,同时闪烁指数还随着传输激光的波长和大气结构常数等的变化而变化。This paper introduces the models of turbulence spectrum as the laser signal propagates through the random atmospheric turbulence, analyses the scintillation effect and beam expansion effect under the condition of considering the inner-scale. It also probes into the influence of inner-scale,the wave length of laser and atmospheric structure constant on wave scintillation based on the modified Rytov method, and makes numerical simulation with MATLAB. The result indicates that the impact of inner-scale on scintillation is important,at the same time the scintillation index varies with the wave length and structure constant of atmospheric.

关 键 词：激光传输 大气湍流 闪烁指数 内尺度 光束展宽 

分 类 号：TN929.12[电子电信—通信与信息系统]