一种卫星姿轨一体化模型预测容错控制方法

Considering the performance degradation of actuators such as satellite thrusters and flywheels during on-orbit servicing maneuvers, a fault-tolerant model predictive control method based on moving horizon estimation is proposed. Firstly, an integrated dynamics error model of satellite attitude and orbit control based on dual quaternion is presented. Based on the model, an explicit model predictive control strategy is designed for pose integrated tracking control. Additionally, considering the degradation fault of thrusters and the flywheels of on-orbit satellite, a moving horizon estimator ( MHE) is designed to quickly estimate the output efficiency of the fault actuator and feed it back to the controller to adjust the controller parameters online and in real time, in order to accomplish the tracking control of the target. The simulation results show that the system can online estimate the fault coefficients of the actuator quickly and accurately and realize the stable tracking control during pose maneuvering process.