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大气湍流参数是评价大气信道对空间激光通信系统性能影响的重要依据。根据机载平台的运动特点,采用差分像运动法并利用夏克-哈特曼传感器与指向、捕获、跟踪伺服单元等设备,在加格达奇地区开展了不同海拔高度下大气湍流参数的分层测量实验。结果表明,在Kolmogorov湍流条件下,该地区日间大气湍流强度随海拔高度的增加而减弱,并在该变化趋势上叠加了大气湍流强度的随机起伏;大气覆盖逆温层顶层海拔高度范围为2.2~2.8km,海拔高度为3.5km的大气相干长度的变化范围为10~26cm。该研究为机载激光通信系统的性能分析提供了重要的参考。
Atmospheric turbulence parameters are important basis for evaluating the influence of atmospheric channel on the performance of space laser communication system. According to the movement characteristics of airborne platform, using the differential motion imaging method and using Shack-Hartmann sensors and pointing, capturing and tracking servo units and other equipment, the atmospheric turbulence parameters at different altitudes are developed in the region of Jiagedaqi Layer measurement experiment. The results show that under Kolmogorov turbulence, the intensity of atmospheric turbulence decreases with the increase of altitude, and the random fluctuation of atmospheric turbulence intensity is superimposed on this trend. The top elevation of atmospheric overhomogeneity is 2.2 ~ 2.8km, and the variation range of atmospheric coherence length of 3.5km above sea level is 10 ~ 26cm. The research provides an important reference for the performance analysis of airborne laser communication system.