航空平台气动光学效应对激光通信光束影响

Influence of Aero-Optical Effect on Laser Communication of Aircraft Platforms

针对航空平台气动光学效应影响航空平台激光通信系统性能的问题,研究了航空器在不同飞行速度和海拔条件下,气动光学效应对激光通信系统通信光传输性能的影响。采用大涡模拟方法分别模拟了在不同飞行速度、海拔下激光通信系统周围的气动流场,计算得到流场的密度变化分布,并根据密度数据建立折射率场,采用龙格-库塔方法求解光束传播方程并进行光线追迹,计算并分析了通信光束经过气动流场后的全视场光程差分布和斯特列尔比。仿真计算结果表明:随着飞行速度的增大,流场密度的变化更为剧烈,光程差逐渐增大,斯特列尔比降低;在飞行速度相同的情况下,随着海拔的增加,流场密度波动减小,光程差减小,斯特列尔比有所提升。所研究成果对补偿机载激光通信过程中的气动光学效应产生的影响以及获得更好的通信质量具有一定指导意义。

To solve the problem of aero-optical effect of the aeronautical platform on the performance of the laser communication system of the aeronautical platform,the influence of the aero-optics effect on the optical transmission performance of the laser communication system is examined under the condition of different flight speeds and altitudes.The large eddy simulation method is used to simulate the aerodynamic flow field around the optical terminal of laser communication at different flight speeds and altitudes,the density change of the flow field is calculated,and the refractive index field is established according to the density data.Furthermore,the Runge-Kutta method is used to solve the beam equation,trace the beam,and calculate and analyze the optical path difference distribution and Strehl ratio of the whole field of view of the communication beam passing through the flow field.The simulation results show that as the flight speed increases,the change in flow field density becomes more intense,optical path difference increases gradually,and Strehl ratio decreases.In the case of the same speed,as the flight altitude increases,the flow field density fluctuation decreases,optical path difference decreases,and Strehl ratio increases.The results of this study are of guiding significance for compensating the aero-optical effect in the process of airborne laser communication and obtaining better communication quality.