长出瞳距静态星模拟器准直光学系统设计

Design of Collimating Optical System for Static Star Simulator with Long Exit Pupil Distance

为提高静态星模拟器对无穷远处星空的模拟精度以满足星敏感器地面标定需要,提出一种长出瞳距静态星模拟器准直光学系统的设计方案。首先结合星敏感器地面测试要求得到星模拟器技术指标,进而计算得到准直光学系统的设计参数,其次选取埃尔弗目镜作为初始结构,通过Zemax软件进行设计优化,主要针对系统的畸变进行约束,最终设计结果为:视场6°,焦距343.77 mm,出瞳距1000 mm,全视场范围内畸变小于0.0276%,MTF接近衍射极限,结合公差分析结果,表明系统成像质量较高且具备良好的稳定性。最后通过对静态星模拟器星点位置误差的计算分析,得到系统的星光出射精度优于6.16″,能够实现在长出瞳距下对无穷远处星空的高精度模拟。

In order to improve the simulation accuracy of the static star simulator for the stars at infinity to meet the ground calibration requirements of the star sensor,an optical system design scheme of the static star simulator with long exit pupil distance is proposed.Firstly,according to the ground calibration requirements of the star sensor,the technical indicators of the star simulator are obtained,so that the design parameters of the collimating optical system are calculated.Secondly,the Elfe eyepiece is selected as the initial structure.The design and optimization mainly constrains the distortion of the system through Zemax software.The final design results are got that the field of view is 6°,the focal length is 343.77 mm,t he exit pupil distance is 1000 mm,the distortion in the entire field of view is less than 0.0276%,and the MTF is close to the diffraction limit.Combined with the tolerance analysis results,it shows that the system has high image quality and excellent stability.Finally,through calculating the position error of the star point,it is obtained that the starlight emission accuracy of the optical system is better than 6.16″,which achieves the high-precision simulation of the starry sky at infinity.