In this paper, a new adaptive sliding mode control method is presented for the longitudinal model of a generic hypersonic vehicle\nsubject to uncertainties and external disturbance. Firstly, an oriented-control model with mismatched uncertainties is built for a\ngeneric hypersonic vehicle. Secondly, the back-stepping technique is introduced to design a sliding mode controller with an\nadaptive law to adapt to the disturbance and uncertainty. Thirdly, a set of nonlinear disturbance observers are designed to\nestimate the lumped disturbance and compensate the sliding mode controller, and the stability of the proposed controller is\nanalyzed by utilizing Lyapunov stability theory. Finally, simulation results show that the effectiveness of the proposed controller\nis validated by the nonlinear model and the proposed method exhibits promising robustness to mismatched uncertainties.
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