时变湍流对动态移动光斑定位精度的影响  

Influence of Time-Varying Atmospheric Turbulence to Facular Orientation Deviation in Dynamic Process

作　　者：沈宝良[1] 孙建锋[1] 周煜[1] 濮莉莉[1] 李兵[1] 刘立人[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800

出　　处：《中国激光》2011年第8期155-160,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(60907006)资助课题

摘　　要：为了研究时变湍流对跟瞄过程中动态平移的光斑定位和跟踪精度的影响,采用改进的逆傅里叶变换方法构造了体现大气湍流特性的随机相位屏,模拟仿真分析了不同强度时变湍流影响下光斑动态平移时探测器感受到的光斑质心与光斑实际质心之间的跟踪偏差、定位偏差与光斑在探测器上位置之间的关系,以及湍流强度对光斑质心定位精度的影响,给出了统计偏差曲线。结果表明,在时变大气湍流的影响下,光斑整体动态平移过程中实际质心的移动距离与接收端探测器感受到的光斑质心移动距离存在一个跟大气湍流强度成正比的偏差。动态平移过程中光斑质心的平移跟踪偏差与定位精度、大气湍流强度以及光斑在接收终端探测器上的位置有关。In order to study the influence of time-varying turbulence to facular orientation precision when the facula is moving during pointing and tracking process, a random phase screen is generated by using modified inverse Fourier transform to simulate the atmospheric turbulence. And then the orientation deviation of the facular barycenter, the relation between the deviation and the facular position in the detector and the orientation precision of the facula are analyzed under different atmospheric turbulence intensities. The results indicate that there is a deviation between actual translational amount of the facular barycenter and that of the barycenter detected by the charge-coupled device in the presence of time-varying atmospheric turbulence, and it relates with the atmospheric turbulence intensity. And the orientation precision relates with both the atmospheric turbulence intensity and the facular position in the detector.

关 键 词：光通信 自由空间激光通信 电荷耦合器件 大气湍流 仿真 数值相位屏 

分 类 号：TN929.1[电子电信—通信与信息系统]