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针对远距离激光测距,如地球同步卫星测距、激光测月,利用基于傅里叶变换的分步传播方法对测距光束在湍流大气中的上行传播进行数值仿真。根据大气结构常数廓线,采用等Rytov指数间隔法分布相位屏,与理论值比对的结果表明相位屏的分布合理。在此基础上,对光束的光斑漂移进行分析,得到光斑漂移量与准直测距光束束腰的定量关系,为测距激光倾斜修正系统的设计提供理论依据。通过对轴上点的闪烁指数分析,发现消除漂移效应后,存在使轴上闪烁指数最小的条件。
For long range laser ranging, such as geostationary satellite distance measurement and laser moon measurement, the up-propagation of distance measuring beam in turbulent atmosphere is numerically simulated by using step-by-step propagation method based on Fourier transform. According to the atmospheric structure constant profile, the Ryvens interval method is used to distribute the phase screen. The comparison with the theoretical results shows that the distribution of the phase screen is reasonable. On this basis, the spot drift of light beam is analyzed, the quantitative relationship between spot drift and collimated beam waist is obtained, and the theoretical basis is provided for the design of laser ranging correction system. By analyzing the scintillation index of the on-axis point, it is found that there is a condition for minimizing the scintillation index on the axis after eliminating the drift effect.