星敏感器是目前航天器用于确定姿态的最先进的空间姿态敏感器之一.文中针对星敏感器的特点,设计了一种星敏感器光学系统.该光学系统焦距为52.5mm,F数为1.5,视场角为12°,光谱范围为480～850nm,选取复杂化的双高斯光学结构形式及选用特殊的玻璃配对.设计的光学系统在宽谱段范围内获得了较好的成像质量,在13.4μm直径范围内能量包围达到85%,在0.85视场内各色光相对主色光的倍率色差在爱里斑直径范围内,全视场畸变小于1%,能获得准确位置坐标的恒星图片,符合星敏感相机使用要求.%The star sensor is one of the spatial attitude sensors which are used to determine the spatial attitude of the space vehicle at present. An optical system of star sensor was designed according to its characteristics in this paper. The optical system had an effective focal length of 52. 5mm, an F-number of F/ 1. 5, a field of view of 12°, and a working wavelength rang of 480～850nrn. The lens system selected a complicated double-Gauss configuration and special glass-couple, and got a better image quality in the wide spectrum range. During 13. 4μm diameter range the encircled energy could get 85％. During 0. 85 field of view the ratio chromatism of each wavelength to primary wavelength was in the range of airy spot diameter.The full field distortion was less than 1 ％. The lens system met the requirements of starsensitive camera.
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