星敏感器杂散光抑制方法及仿真分析

星敏感器的探测目标是深黑空间中的恒星，属于暗目标探测系统，对杂散光的干扰非常敏感，因此，星敏感器杂散光抑制能力是其观测能力的重要影响因素。以点源透过率（PST）为评价指标，计算观测目标7.5等星时星敏感器需要达到的杂散光抑制指标，并以此为基础，提出一种有效的杂散光抑制方法，包括外遮光罩设计、消杂散光光阑设计，以及内部机械结构的关键表面的消杂散光处理。采用Lighttools软件对设计结果进行仿真，设计与分析结果表明，该杂散光抑制方法能够有效抑制星敏感器的杂散光，实现观测7.5等星的目标。 

Stray light suppressing technique and simulation for star sensor

Star sensor used for deep space stars exploration is a faint signal detector. Star sensor is sensitive to slender stray light, and therefore, the stray light suppressing ability is a key influencing factor of the exploration ability. Through the point source transmittance (PST), the suppression indicators of the star sensor are calculated by the standard of the target brightness which is detected 7m.5 stars. Based on the standard evaluation, an effective suppressing technique is proposed, which includes the design of baffle, stop and special artificial processes for critical objects. In the end, the simulation results are analyzed and calculated with Lighttools software. The results indicate that the stray light suppressing technique is effective, and the results can meet the needs of detecting 7m.5 stars.