基于硅基液晶拼接的高对比度动态星模拟器光学系统

发布时间：2018-08-06 08:15

【摘要】：针对基于硅基液晶(LCOS)拼接技术的动态星模拟器对比度低,无法在星图识别过程中为星敏感器提供全部有效目标的问题,提出通过抑制光学系统杂散光来提高LCOS拼接动态星模拟器对比度的方法,讨论了偏振度对于杂散光的影响,并推导出入射角与偏振度的函数关系。设计了抑制杂散光的光学系统,该系统包括利用复合抛物面聚光器(CPC)结合望远系统组成照明光源,配合多棱镜的1/4波片和视场角不小于11°的准直光学系统。在截止频率为60lp/mm,视场角小于±5°的情况下,该准直系统的调制传递函数(MTF)大于0.7。实验显示:该高对比度LCOS拼接动态星模拟器的星间角距误差小于18″,相对于传统型的星模拟器杂散光降低了2.38倍,其在保证精度的条件下,降低了动态星模拟器的背景噪声,提高了动态星图的可识别率,基本可以满足星敏感器在多星等条件下的对精度和动态特性的需求。
[Abstract]:In view of the low contrast of dynamic star simulator based on silicon based liquid crystal (LCOS) splicing technology, it can not provide all the effective targets for star sensor in star map recognition. A method to improve the contrast of LCOS splicing dynamic star simulator by suppressing stray light in optical system is proposed. The influence of polarization on stray light is discussed and the functional relationship between incidence angle and polarization degree is deduced. An optical system for suppressing stray light is designed. The system consists of a composite parabolic concentrator (CPC) combined with a telescopic system to form an illuminating light source, a 1 / 4 wave plate of a multi-prism and a collimation optical system with a field of view angle of not less than 11 掳. The modulation transfer function (MTF) of the collimation system is greater than 0.7 when the cutoff frequency is 60lp / mm and the field angle is less than 卤5 掳. The experimental results show that the inter-satellite angular distance error of the high contrast LCOS splicing dynamic star simulator is less than 18 ", and the stray light of the traditional satellite simulator is reduced by 2.38 times, and the background noise of the dynamic star simulator is reduced under the condition of guaranteed precision. The recognition rate of the dynamic star map is improved and the accuracy and dynamic characteristics of the star sensor under the condition of multi-star are basically satisfied.
【作者单位】：长春理工大学光电工程学院;吉林省光电测控仪器工程技术研究中心;
【基金】：国家863高技术研究发展计划资助项目(No.2008AA12A203)
【分类号】：V416.8

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