高精度星相机光学系统像质评价及实现

摘要： 高精度星相机光学系统是实现高性能星相机的关键技术.从工程实际出发,梳理星相机光学系统像质评价的指标,重点论述星点质心位置指标分解、光学系统评价指标分解过程.分析认为星相机光学系统设计过程中需关注质心位置偏差和质心位置与理想像高的偏差、温度分析需兼顾均匀温升及梯度温度变化.给出一个继承于双高斯结构形式的设计实例,结合像差理论进行消热设计和畸变控制,分析不同温度条件下不同类别恒星的质心位置一致性.设计结果表明该光学系统可满足高精度星相机指标要求.

Evaluation and Implementation of Image Quality in High Precision Star Camera Optical System

Abstract： The star camera optical system is the key technology to achieve high precision performance of the star camera. Based on the engineering practice, the index of image quality evaluation for star camera optical system is combed, and the index decomposition of star point centroid position and the decomposition process of optical system evaluation index are mainly discussed. The analysis shows that: a. both of the centroid position deviation and the central of star point deviation relative to the ideal image height need to be focused on. b. the rise of uniform temperature and the change of gradient temperature need to be taken into account in the optical design process. An example of the star camera optical system design is given, which is based on the double Gauss form, and the aberration theory is applied in the optimization process, with well heat dissipation design and distortion control. The centroid position consistency under different temperature conditions of different types of the fixed stars is analyzed. The results show that the optical system can meet the requirements of high precision star camera specifications.