基于误差解耦的星敏感器热漂移标定系统研究

Research on Calibration System of Star Sensor Thermal Drift Based on Error Decoupling

提出一种基于误差解耦的星敏感器热漂移标定系统。根据标定原理和星等模拟要求,设计自准直光学标定系统和误差解耦光路。根据共光路特性,由自准直仪和CCD获得星敏感器安装误差和热变形与安装变形形成的耦合误差,将安装变形误差从耦合误差中剔除后获得准确的星敏感器姿态转移四元数。仿真试验结果表明,温度范围在-25~60℃环境下,星敏感器标定时绕各轴产生的最大变化误差分别为0.2638,0.1317,0.0472(″)/℃,与理想结果误差控制在0.02(″)/℃的范围内,这为减少星敏感器标定中产生的耦合误差和提高热漂移标定精度提供一种新的思路和方法。

A star sensor thermal drift calibration system based on error decoupling is proposed.According to the calibration principle and the simulation requirements of the star,a self-collimation optical calibration system and an error decoupling optical path are designed.According to the characteristics of common optical path,the installation deformation error of the star sensor and the coupling error caused by the thermal deformation and the installation deformation are obtained by the autocollimator and the CCD,removing the installation deformation error from the coupling error to obtain accurate star sensor attitude shift quaternion.The simulation results show that the maximum variation errors of the star sensor around the axes are 0.2638,0.1317,0.0472(″)/℃in the environment range of-25~60℃,respectively,and the errors are controlled in the range of 0.02(″)/℃with the ideal result.This provides a new idea and method to reduce the coupling error generated in the calibration of star sensors and improve the accuracy of thermal drift calibration system.