高精度星敏感器测试设备的设计

针对现有动态星模拟器在高精度星敏感器测试中无法满足星点位置和照度均匀性的高精度模拟等实际问题，设计了一种高精度动态星模拟器。分析了星模拟器光学系统与调整机构的任务需求。为保证星点的投射精度，提出了LCOS 的光学拼接方法，优化设计了大视场、大相对孔径的准直光学系统并进行了像质评价；为满足显示器件照明条件和星点照度均匀性的要求，对照明光学系统进行了仿真设计并给出了照度分布；为减小对接误差提高对模拟器的测试精度，确定了高分辨力五维调整架的机械结构，应用CATIA 软件对调整机构的设计进行了三维建模，理论计算结果显示调整机构位移分辨力为18 nm，角度分辨力为0.05。通过实际检测，微调整机构稳定性好，出射星点照度不均匀性优于10%，模拟星点的单星位置误差小于7，星间角距误差优于12，满足当前对高精度星敏感器测试的技术指标要求。

Test equipment design of high precision star sensor

Considering the practical problem that existing equipment can not complete the mission of high precision simulating stars'position and illumination uniformity of star points in the test of high precision star sensor, a type of high precision dynamic star simulator was designed. To ensure the accuracy of the projected stars, a method of LCOS optical splicing was presented. Optimization principles and image quality evaluations of the collimating optical system with large field of view were give in detail. In order to meet the lighting conditions and illumination uniformity, an illuminating optical system using fly eye lens was designed. By determining mechanical structure of the five dimensional high-resolution adjustment frame and establishing three-dimensional model of design results with CATIA, displacement resolution was achieved to 18 nm, angle resolution was achieved to 0.05. Through experimental tests, it is found that the micro-adjustment mechanism is stability, the illumination inhomogeneity is better than 10% and angular distance accuracy is less than 12. The designed simulator can approach the test requirement of high precision star sensor.