基于畸变梯度重构畸变的在轨标定方法

On-orbit Calibration Method Based on Distortion Gradient Reconstruction Distortion

提出一种基于畸变梯度重构畸变的在轨标定方法,该方法充分利用微角秒测量精度的星间距测量技术,不受恒星赤经、赤纬精度的限制,能使望远镜光学畸变的标定精度达到微角秒量级。介绍了基于畸变梯度重构畸变的原理,并对由光学设计软件导出的光学系统进行了畸变标定仿真实验,结果表明:当光学系统波像差控制在0.0733λ内且星角间距测量误差为0.3微角秒时,畸变标定精度可达0.28微角秒,满足近邻宜居行星探测的畸变标定要求。

In this paper,an on-orbit calibration method based on distortion gradient reconstruction distortion is proposed.It makes full use of the star spacing measurement technology with the measurement accuracy of micro arc seconds,thus it does not need to use star catalogue,and is not limited by the accuracy of stellar right longitude and declination.The calibration accuracy of optical distortion of the telescope can reach the order of micro arc seconds.The principles of distortion reconstruction based on distortion gradient are introduced,and the distortion calibration simulation experiment is carried out on the optical system derived from the optical design software.The results show that when the wave aberration of the optical system is controlled within 0.0733λand the measurement error of star angle spacing is 0.3 micro arc seconds,the distortion calibration accuracy can reach 0.28 micro arc seconds,which meets the distortion calibration requirements of nearest neighbor habitable planet exploration.