星敏感器遮光罩消光比定量测试及数据处理方法

面向星敏感器在轨工作时的杂光抑制需求，开展星敏感器遮光罩消光比定量测试及数据处理方法研究。基于高灵敏度弱光探测组件、高精度电控转台以及太阳模拟器搭建杂光集成测试平台，在电控转台步进电机的驱动下实现不同光照角度时遮光罩消光比测量数据的实时获取。根据构建的数据处理模型计算获得遮光罩的消光比，并基于A类不确定度评定方法完成消光比测量的不确定度分析。从测量结果可以看到，在光照入射天顶角达到保护角30度时，消光比测量值达到10-6量级，在光照入射天顶角为54度时，消光比测量值达到10-7量级，且多次测量数据的变化规律基本一致。测量结果表明了测量方案的合理性和可行性，可为星敏感器系统方案设计、测试与评估提供重要的技术支持。

Quantitative Testing and Data Processing for the Extinction Ratio of the Star Sensor Hood

For the stray light suppression requirement of star sensor in orbit operation, the research on the extinction ratio quantitative test and data processing method of star sensor hood is carried out. The stray light integrated test platform is built based on the high-sensitivity detection module for weak light, high-precision electronically controlled turntable and solar simulator. The real-time measurement data of the extinction ratio of the hood under different incident angles are obtained by the driving of the stepping motor of the electronic control turntable. The extinction ratio of the hood is calculated according to the constructed data processing model, and the uncertainty analysis of the extinction ratio measurement is completed based on the class A uncertainty evaluation method. It can be seen from the measurement results that the extinction ratio measurement value reaches 10-6 when the incident zenith angle reaches 30 degrees which is the protection angle. At the same time, when the incident zenith angle is 54 degrees, the extinction ratio measurement value reaches 10-7. Moreover, the variation of data under multiple measurements is basically the same. The measurement results show the rationality and feasibility of the measurement scheme, and it can provide important technical support for the design, test and evaluation of the star sensor system.