Research On Fault Tolerant Control Of Agile Satellite Attitude Control System

The attitude control system of the agile satellite throughout the entire process of satellite mission,especially the fault tolerant systems of the attitude.It determines the performance of the agile satellites.In this paper,design the fault tolerant algorithm of the satellite attitude throughout improved the traditional attitude control,the controller and the allocation algorithm.This algorithm can achieve the agile control of the satellite attitude,the accurate output of the effect torque,and achieve the purpose of the satellite attitude what is the rapid mobility and the high precision stable under the fault conditions.And in this paper,depth study about the fault tolerant systems of the agile satellite attitude,focused on solving the problem what is the system modeling of the control system,the design of the controller,the design of the control allocation algorithm,specifically as follows:For the satellite attitude model,analysis the errors of satellite and the failure of the control system of the satellite control,derived the dynamics model of the satellite attitude,including the error dynamics model and the fault dynamics model of the satellite attitude.For the failures of the momentum wheel in the stabilized satellite and the actuator failure,sensor failure,actuators and sensors failure at the same time in the agile satellite design the corresponding fault tolerant controller.The controller to achieve the control of the short-term attitude rapid mobility,the accuracy attitude stabilization by the satellite control system in case of failure.And verify the stability of the controller from the theory and simulation.For the typical configuration what are the same actuator and the heterogeneous actuator,design the corresponding control allocation algorithm to achieve the reasonable distribution of the controller output,ensure the torque output of the control system of the agile satellite attitude,avoiding the actuator into the singularity,fled the singular surface,and reducing the probability of failure of the control system in the extent.And verify the effectiveness of the control allocation algorithm by the mathematical simulation.Finally,write the software about fault tolerant systems of the agile satellite attitude.According to the workflow of the attitude control,And verify the correctness and effectiveness of the fault tolerant systems of the satellite attitude.