湍流大气成像系统长曝光传递函数的研究

采用傅里叶变换法对在Kolmogorov谱大气湍流下望远镜的长曝光成像进行了模拟,给出了湍流大气成像系统长曝光传递函数的数值模拟方法,求出了在此情况下的长曝光传递函数。给出了大气湍流在Kolmogorov谱假设下成像系统长曝光传递函数的理论值。基于空间目标为点目标的假设,提出了一种湍流大气成像系统长曝光传递函数的测量方法。对由三种方法获取的大气湍流长曝光传递函数进行了比对分析。结果表明,由三种方法获取的大气湍流长曝光传递函数基本上是一致的,由傅里叶变换法模拟和实际测量得到的传递函数是合理的。

Study of the long exposure transfer function of imaging system in turbulence

The long exposure imaging of the imaging system through atmosphere is simulated by Fourier transform,the long exposure transfer function is presented,and the theory transfer function is presented,which is based on the cascade turbu- lent model of the Kolomogorov 1941 theory.A method to measuring the long exposure transfer function is presented,which is based on the hypothesis that the space object is point target.Based on the comparison results,it is concluded that the three re- sults are same almost,and that the transfer function gained by Fourier transform and real measurement method is reasonable.