Quasi-continuous higher-order sliding mode control for attitudes of re-entry vehicle
再入飞行器姿控系统的准连续高阶滑模设计

We propose a quasi-continuous higher-order sliding mode control strategy for the re-entry vehicle in the presence of parameter uncertainties and external disturbances. This attitude control system is divided into fast loop and slow loop based on singular perturbation. The sign function is replaced by the norm-type switching function for the continuous virtual control in the slow loop. The fast loop consists of the integral fast terminal sliding mode control, the feedback control and the quasi-continuous higher-order sliding mode control. Theoretical analysis and simulation results show strong robustness and weak chattering.