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大气湍流一直是限制空间激光通信的主要因素。提出了一种模拟大气湍流效应的新方法,在接收端用一对相关的幅度屏与相位屏来模拟大气湍流效应。针对星到地的激光通信,论文先将二重积分形式的幅度自相关、相位自相关以及幅度-相位互相关函数简化为一重积分的形式;然后根据这三种相关函数,基于协方差随机屏模拟方法同时产生一对相关的随机幅度屏与相位屏;并比较了模拟屏的结构函数与理论结构函数的符合度。该方法可有效模拟湍流内、外尺度对湍流效应的影响。
Atmospheric turbulence has been a major factor in limiting space laser communications. A new method to simulate the atmospheric turbulence is proposed. At the receiving end, a pair of related amplitude and phase screens are used to simulate the atmospheric turbulence effect. According to the star-to-ground laser communication, the paper first reduces the magnitude autocorrelation, the phase autocorrelation and the amplitude-phase correlation to the form of one-point integral. Secondly, based on these three correlation functions, The simulation method produces a pair of related random amplitude and phase screens at the same time, and compares the coincidence of the structure function of the simulation screen with the theoretical structure function. The proposed method can effectively simulate the effect of internal and external turbulence on turbulence.