机载激光通信中气动光学的影响及补偿

发布时间：2019-06-10 17:40

【摘要】：为了抑制机载激光通信中大气附面层引起的散斑现象,开展了气动光学效应及相应补偿方法的研究。从理论上分析了气动光学效应对光传输的影响;根据试验飞机型号和设备安装位置,对光学窗口形状、厚度等参数进行了优化设计,并对窗口变形和空气流场分布进行了仿真分析,完成了光学窗口改造。最后,根据试验中大气附面层引起的接收光斑离焦现象,进行了光学仿真,研制了3种焦距的补偿镜。在飞行距离为10~140km,飞行高度为1 500~4 500m条件下进行了飞行试验,对不同补偿镜的补偿效果进行了分析。结果显示,在接收光路中增加焦距为5.5×105 m的凸透镜后,接收光斑离焦现象得到了抑制,接收光功率闪烁方差减小了1/3,表明经过补偿后的光学窗口可有效抑制大气附面层对激光通信的的影响。
[Abstract]:In order to suppress the speckle phenomenon caused by the atmospheric boundary layer in the airborne laser communication, the research of the pneumatic optical effect and the corresponding compensation method is carried out. The influence of the pneumatic optical effect on the optical transmission is analyzed theoretically, and the parameters such as the shape and thickness of the optical window are optimized according to the model of the test aircraft and the installation position of the equipment, and the deformation of the window and the distribution of the air flow field are simulated and analyzed, and the modification of the optical window is completed. In the end, the optical simulation was carried out according to the phenomenon of the off-focus of the receiving spot caused by the atmospheric boundary layer in the experiment, and the three focal length compensation mirrors were developed. The flight test is carried out under the condition that the flying distance is 10 to 140 km and the fly height is 1,500 to 4,500 m, and the compensation effect of the different compensation mirrors is analyzed. The results show that, after a convex lens with a focal length of 5.5 to 105 m is added in the receiving optical path, the phenomenon of receiving the light spot off-focus is suppressed, and the fluctuation variance of the received light power is reduced by 1/3. It is shown that the compensated optical window can effectively inhibit the influence of the atmospheric boundary layer on the laser communication.
【作者单位】：吉林大学机械科学与工程学院;长春理工大学空地激光通信技术国防重点学科实验室;
【基金】：国家863高技术研究发展计划资助项目(No.2012AA0042)
【分类号】：TN929.1

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