Scintillation is a highly discussed problem in laser atmospheric transmission, which plays an important role in improving the reliability and performance of laser communication systems. In this study, numerical simulations are conducted using a computational model to investigate the variation of the on-axis scintillation index of the focused platform beam during horizontal atmospheric propagation, considering different transmitter aperture sizes. The simulation results indicate that the aperture size significantly affects the scintillation index. Under the same Rytov variance conditions, larger aperture sizes lead to stronger scintillation effects. For smaller aperture sizes, the scintillation index maintains a relatively linear relationship with the Rytov variance. The findings of this study provide further insights into the factors influencing the scintillation characteristics in laser atmospheric transmission and offer valuable references for the design and engineering applications of laser communication systems.
The distribution of wind speed with height will affect the optical turbulence parameters. Based on the reanalysis data of the National Centers for environmental prediction (NCEP), this paper analyzes the monthly and seasonal variations of wind speed in the Tibetan Plateau region during the past 15 years from 2005 to 2020 at Delingha observatory, It is found that the seasonal variation trend of the seeing and 200 hpa wind speed is consistent, and the Fried parameter is negatively correlated with 200 hpa wind speed, which verifies the possibility that the upper air speed can approximately represent the turbulence intensity of the whole layer. The experimental results show that: in autumn and winter, the high altitude wind speed is strong, the seeing is poor, and the astronomical observation imaging effect is poor; In summer, the high altitude wind speed is low and the seeing is good, which is the best time for astronomical observation.
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