测距光束光斑漂移的数值仿真  

Numerical Simulation of Wander of Ranging Laser Beam

作　　者：李荣旺[1] 常翔[1] 熊耀恒[1] 

机构地区：[1]中国科学院国家天文台云南天文台,云南昆明650011

出　　处：《光学学报》2011年第11期1-6,共6页Acta Optica Sinica

基　　金：国家自然科学基金(10778705)资助课题

摘　　要：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 the application of long-distance laser ranging, such as geosynchronous satellite laser ranging and lunar laser ranging, the uplink beam is simulated by using split-step numerical method （or fast-Fourier-transform beam propagation method）. Using unequal interval phase screen distribution according to the profile of atmosphere structural constant, the average propagation intensity is in good agreement with theoretical value. Based on this, the effect of beam wander is analyzed, which is the main reason of intensity decrease on axis. So after the removal of beam wander, without pointing error, the intensity on axis increases roughly. This improves the probability of detecting echo of laser ranging. It is found that there is a proper initial beam waist to minimize the on-axis scintillation index. The simulation results are very useful to the design of tip-tilt correction system.

关 键 词：大气光学 数值仿真 光斑漂移 远距离激光测距 

分 类 号：P425.2[天文地球—大气科学及气象学]