时间平均流场对星图影响的仿真研究

针对高超飞行器在飞行过程中产生的高速流场光学传输效应对星图的影响，运用雷诺平均法对飞行器边界湍流流场参数进行了计算，采用光线追迹法计算了星光在高速流场中的传输路径，应用物理光学法计算得到时间平均流场的光学传递函数，最后对气动光学效应退化星图进行了模拟。仿真结果表明．时间平均流场使得星光传输发生偏移和模糊，导致畸变星图中...

Analysis of the effect on the star image induced by time average flow field

Numerical simulation and analysis of aero-optic effects on star image induced by time average flow field were carried out. First, the computation of the parameters characterizing the hyper-speed turbulence field were obtained by solving its N-S equations via RANS method. Second, the starlight trajectories passing through a flow field were acquired with the ray-tracing method. Then the transfer function to represent the aero-optie effects was derived using the physical optics method. Finally, a turbalence-degraded star image was simulated. The simulation results shows that the time average flow field results in the blurring and shifting of the objects in the acquired images , so that the star magnitude and the position of the stars in the star image change, which effects the success rate of star match.