星敏感器遮光罩的优化设计

Optimal Designing of Baffle of Star Sensor

星敏感器主要针对空间弱小运动目标成像,背景杂散光严重影响星像点获取的准确性。因此,遮光罩设计是星敏感器的关键技术之一。给出了星敏感器遮光罩设计的基本原则,并推导了两节型遮光罩最优长度设计的公式,简要分析了遮光罩长度、张口直径和张角的关系,并结合某星敏感器进行了仿真验证。结果表明,与桶形结构相比,新的设计结构紧凑,对视场外强光的抑制能力大大增强,能实现观测六等星的目标。

Star sensor is imaging the space weak star point.The background noise from stray light will badly affect the extracting accuracy of image.So baffle design is the key technology of the star sensor.In this paper,the principle of baffle design is listed,the formula of the optimum length for two-stage baffle is deduced and an example of baffle design of a star sensor is cited.It is indicated that the new design has shorter length and better performance in stray light attenuation than the traditional barrel baffle.