高超声速变外形飞行器固定时间抗饱和控制

An adaptive fixed-time control method is proposed to address the design challenges of the control system for hypersonic morphing flight vehicle，considering full state constraints，input saturation，parameter uncertainty，and deformation morphing disturbances. Utilizing the back-stepping control framework，along with the barrier Lyapunov function and fixed-time stability theory，a fixed-time control law is devised. This law effectively tackles the full-state constraint problem，accelerates convergence speed，and ensures that the convergence time remains unaffected by initial deviations. Additionally，an adaptive disturbance estimation law and an anti-saturation compensator are designed to mitigate the adverse effects of parameter uncertainty，unknown morphing dynamic coupling disturbances，and control input saturation on the system. Based on Lyapunov theory，it is demonstrated that the control law achieves fixed-time convergence of the attitude control error within the constrained range. Six-degree-of-freedom simulations confirm the effectiveness of the proposed adaptive fixed-time control method.