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Design on Optical Lens of Aircraft-borne Star Tracker

WANG Yang1,2,ZHANG LI ping1,WANG Zhi1,QIAO Ke1(1 Changchun Institute of Optics,Fine Machanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)(2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China)  
This article carries on the optical design and the structural design on one kind entire day aircraft-borne star tracker′s optical lens.It uses Cassagrain refraction and reflecting system,and the angular resolution is 2 angular seconds,optical system's energy concentration degree achieves above 90% in a CCD pixel size,the distortion is smaller than 3‰,the biggest spot′s diameter is 7.6 μm,the others aberration also obtain very good adjustment.To enhance the limiting magnitude which the star tracker surveys,designing a light filter control element.This design satisfies the user to the high accuracy stellar guidance system's demand.
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