Robust Attitude Control Design for a Hypersonic Vehicle with Multi-Constraints

A constrained robust attitude control algorithm is addressed for a hypersonic vehicle with angle of attack constraint, input nonlinearities and uncertainties in this paper. First, the angle of attack constraint issue is properly handled by the integral barrier Lyapunov functions (IBLF) method integrating with the dynamic surface control technique. Moreover, the angle of attack is guaranteed in its constrained set while the “explosion of complexity” is properly avoided. Then, to eliminate the effectiveness of the actuator nonlinearities, a novel auxiliary error compensation design is employed based on the compensated tracking error. In addition, the uncertainties are estimated and compensated by utilizing the nonlinear disturbance observer. Finally, the uniform ultimately boundedness of the closed-loop control system is rigorously ensured by the Lyapunov theorems. The numerical simulation results demonstrate the effectiveness of the proposed method.