关键词: 星敏感器, APS探测器, 辐照, 损伤

Abstract: Star sensor is the attitude measurement equipment that satellite mainly depends on in orbit operation stage. It is an important part of satellite guidance, navigation and control subsystem. The star sensor is easily damaged by laser irradiation during its on orbit operation. This paper studies this problem, designs and carries out the damage experiment of laser irradiation and simulation modeling of the star sensor, and completes the model verification. The results show that the laser power density is in the range of 1.2~3.5 ×105 W/cm2, and the APS detector of star sensor has damage effects such as line damage, cross damage and large area damage. The micro morphology observation shows that the circuit layer above the photosensitive element of the detector is damaged. Based on the finite element analysis method, the probability model of APS detector damaged by laser is established. The simulation results are in good agreement with the experimental values, which provides data support and analysis model for studying the damage effect of laser on star sensor.

Key words: star tracker, sensor, irradiation, damage