广角红外地球敏感器光学系统设计及畸变校正

为了满足低轨道航天器姿态轨道控制系统对小型化地球敏感器的需求，对广角长波红外地球敏感器光学系统设计及成像畸变校正技术进行了研究。广角长波红外光学系统采用反远距结构形式，由三片锗透镜实现140°的视场角，光学系统工作波段为14 μm~16.25 μm，F数为0.8。广角长波红外光学系统体积小、结构简单，并且成像质量良好，实现了红外地球敏感器光学系统的小型化高精度设计。采用分视场区间分别建立畸变校正公式的方法来实现光学系统成像畸变校正，校正精度优于像元尺寸的1/5，可满足敏感器产品姿态测量的需求。

Design of optical system of wide angle infrared earth sensor and study on distortion correction

In order to meet the requirements of low orbit spacecraft guidance, navigation and control (GNC) system for light small infrared earth sensor, the design on wide angle long-waveband infrared (LWIR) optical system and its distortion correction were studied. The wide angle LWIR optical system consists of 3 germanium lenses, using the form of retro-focus imaging, its full field of view could be 140°. The operating wavelength range is 14μm~16.25μm, and F number is 0.8. The optical system is characterized by small volume, simple structure and high image quality, the miniaturization and high-precision design of the infrared globe sensor optical system can be realized. Different distortion correction formulas were established for different field ranges, and the correction error is less than 1/5 pixel size. The distortion correction method can meet the requirement for attitude measurement of sensor products.