Abstract: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.