Strong Robust Attitude Control of the Large Launch Vehicle Based on Backstepping Design Approach

Further and more complex human space exploration missions require higher reliability of the large launch vehicles, so fault-tolerant control techniques for attitude systems have received much attention. This paper establishes a launch vehicle attitude control error system with a lower triangular structure. In the algorithm design, the integral sliding mode control and robust control methods are combined using the backstepping design method to form a passive fault-tolerant control with strong robust characteristics. The algorithm is subjected to a rigorous stability analysis through the Lyapunov function. Finally, the designed algorithm is carried out in simulation experiments under strong external perturbations and significant actuator faults to verify the fast convergence and effectiveness of the attitude control algorithm.