Abstract
Aiming at attitude tracking control for hypersonic reentry vehicle, an adaptive backstepping controller based on sliding mode disturbance observer is proposed in this article. First, the strict-feedback nonlinear model with uncertain aerodynamic parameters and external disturbances for the hypersonic reentry vehicle is established. Then, a sliding mode disturbance observer is designed to estimate external disturbances for the proposed controller. In addition, the adaptive backstepping controller with the sliding mode disturbance observer is proposed, in which adaptive strategies are used to estimate the uncertain aerodynamic parameters online. Finally, according to the Lyapunov theorem, the tracking errors of the closed-loop attitude stabilization system are proved to be ultimately bounded. Simulation results show that the proposed controller can achieve adaptive tracking control under the influences of parameter perturbation and external disturbances.
Highlights
Hypersonic reentry vehicle (HRV) control is the hotspot in aeronautics and astronautics research field.1–5 The hypersonic vehicles have the characteristics of hypervelocity, complexity, and fast time-varying environment
An adaptive sliding mode disturbance observer (SMDO) is designed, which can estimate the external disturbances in the hypersonic reentry vehicle (HRV) model directly
With the external disturbances d estimated by SMDO, the proposed controller can compensate the influences of the external disturbances, as well as the errors converge in short time with good tracking performance about desired trajectory
Summary
Hypersonic reentry vehicle (HRV) control is the hotspot in aeronautics and astronautics research field.1–5 The hypersonic vehicles have the characteristics of hypervelocity, complexity, and fast time-varying environment. There are some challenges in the tracking control for HRV such as nonlinearities, parameter uncertainties, and external disturbances. To suppress the external disturbances and parameter uncertainties in the HRV nonlinear control, the adaptive backstepping controller with sliding mode disturbance observer (SMDO) is proposed in this article. A nonlinear DO17 based on sliding mode backstepping controller was designed to estimate and compensate the model uncertainties.
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