Active Fault-Tolerant Control of Rocket Based on Dynamic Output Feedback Control

The launch vehicle attitude control system is taken as the research object in this paper, which is analyzed the function and composition of the system. A fault model of a certain type of launch vehicle attitude sensor is established, and a fault simulation analysis is conducted. Based on the idea of interference decoupling, a fault detection and fault isolation algorithm based on unknown input observers is proposed. According to the regional pole placement theory, a robust unknown input observer is designed, which realizes the complete decoupling of estimation error and unknown input, and improves the accuracy of fault estimation. Finally, based on the obtained fault estimation information, a main fault- tolerant control method based on dynamic output feedback control is proposed, and the fault-tolerant control algorithm and the digital PD control method are simulated and compared under the same initial conditions.