逆向调制光通信弱湍流下闪烁指数分析

Analysis on Scintillation Index of Modulating Retro-Reflector Optical Communication in Weak Atmospheric Turbulence

运用多相位屏建模的方式建立了弱湍流下的逆向调制光传输模型,模拟了距离小于1 000 m情况下平面光在逆向调制光传输链路中的传输过程。通过改变整个数值分析过程中的大气折射率常数,探究了大气折射率常数对逆向调制光传输链路的闪烁指数的影响。结果表明,在弱湍流中,大气折射率常数越大,逆向调制光传输链路的闪烁指数越大。当大气折射率常数小于10^(-17)时,闪烁指数达到非常小的数值,大气湍流基本不产生影响。选定较大大气折射率常数的情况下,分析逆向调制端的反射镜的大小对逆向调制光传输链路的闪烁指数的影响。结果表明,逆向调制端的反射镜的尺寸越大,整个链路的闪烁指数越小。但是,随着逆向调制端反射镜的尺寸不断增大,对于闪烁指数的改善效果会越来越小。

A multi-phase screen modeling method is used to establish a modulating retro-reflector optical transmission in weak atmospheric turbulence.The transmission process of plane light in the modulating retro-reflector optical communication link is simulated when the distance is less than 1000 meters.By changing the atmospheric refractive index constant during the whole numerical analysis,the influence of the atmospheric refractive index on the scintillation index of the modulating retro-reflector optical transmission link is explored.The experiment results indicate that the greater the atmospheric refractive index constant in weak turbulence,the greater the scintillation index of the modulating retro-reflector optical transmission link is.When the atmospheric refractive index constant is less than 10-17,the scintillation index reaches a very small value.The influence of the reflector size on the scintillation index of the modulating retro-reflector optical transmission link is analyzed in the case of a larger atmospheric refractive index.The results indicate that the larger the reflector size,the smaller the link's experiment scintillation index is,but the improvement on the scintillation index would be less and less with the increase of the reflector size.