为了提高飞机导航系统的精度，本文设计了一种全天时机载星跟踪器的光学镜头，通过光学设计和像差分析，使光学系统的角分辨率为2角秒，在一个CCD像元尺寸内光学系统的能量集中度达到90%以上，畸变小于3‰，弥散斑直径最大7.6 μm，其他各种像差也得到了很好的校正.同时为了提高星跟踪器探测的极限星等，设计了有六个档位的滤光片调节机构.本设计满足用户对高精度天文导航系统的需求.

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.