Approach to Model Reference on Orbit Fault Diagnosis of Satellite Attitude Control System Based on Measurement of Environment Torques

According to principle of model reference adaptation, an approach to model reference on-orbit fault diagnosis for satellite attitude control system was proposed based on measurement and calculation of environmental torques acted on satellite. In view of satellite kinematics and attitude dynamics, a linear model for satellite attitude control system is established. On the basis of system parameter and structural characteristics，the reference model of satellite attitude control system is built and improved through measurement and calculation of environmental torques. In this way, the fault residual vector is generated through comparative analysis of the output of reference model with the one of real system and the disturbance is estimated by using extended state observer and augmented matrix method so as to accomplish the sensor fault detection and isolation. Simulation experiment results demonstrate its effective for on-orbit real-time fault diagnosis of satellite attitude control system