Attitude Control of Rigid-Elastic Coupled Hypersonic Vehicle Based on Active Disturbance Rejection Control

To address the challenge of reentry attitude stability control induced by the rigid-elastic coupling dynamics of hypersonic vehicles, a stable tracking control method based on active disturbance rejection control (ADRC) is proposed. A rigid-elastic coupling dynamics model is constructed, considering parameter perturbations and external disturbances. An auxiliary error subsystem is formulated to decouple the dynamic model into velocity and altitude subsystems. An extended state observer (ESO) is designed to accurately estimate state variables and compensate for disturbances in real-time, significantly enhancing the system's robustness. A tracking differentiator is introduced to resolve the “differentiation explosion” issue commonly encountered in traditional backstepping control. Simulation experiments demonstrate that the proposed control method achieves precise tracking control of velocity and altitude within a ±20% range of aerodynamic parameter deviation and effectively suppresses the adverse effects of elastic modes and external disturbances.