基于数字光处理技术的小型星模拟器设计

提出了基于数字光处理(DLP)技术的星模拟器系统的技术方案。根据星模拟器技术指标,确定了总体光学结构;在确定数字微镜元件(DMD)芯片规格的基础上,计算出星模拟器光学系统的焦距、单星张角、相对孔径等光学系统参数;最后,介绍了星图模拟软件的设计方法。计算及模拟结果表明,设计的小型星模拟器实现了星图视场为10.5°×7.5°,模拟星等为2.0~8.0等星,单星张角优于40″;将采样周期控制在毫秒量级,能为星敏感器提供任一时刻、任一惯性坐标系下指向的模拟星图,可满足航天工程中对小型星模拟器的动态性、大视场、宽星等范围、短采样周期等需求。

Design of a mini star simulator based on digital optical processing

The technical scheme of a star simulator based on Digital Light Processing (DLP) technology is proposed in order to meet the demands of a star sensor in spacecraft engineering. The general optical structure is confirmed according to the technical indexes of a star sensor. Then, the optical system parameters of the simulator are calculated by the specification of a Digital Micro-mirror Device (DMD). Finally, a dynamic display algorithm for the star map is introduced. The simulating results indicate that field of view of 10.5°×7.5°, star magnitude simulated of 2.0~8.0 and the single-star field angle of less than 40″ are obtained, and the sampling period is controlled within several milliseconds. The experimental result can satisfy the system requirements of big field of view, wide magnitude range and short sampling period.