Abstract:

A robust control method based on disturbance estimation is proposed in order to address the altitude and velocity tracking problem for hypersonic flight vehicles with parameter uncertainty and external disturbance. Firstly, a flight vehicle mode is established considering parameter uncertainties and external disturbances. And then, the model is linearized based on the dynamic inversion control method. The total effect of the uncertainties and disturbances for the system is regarded as the lumped disturbance, which is then estimated together with the system states by the linear extended state observer. Subsequently, the lumped disturbance is integrated into the baseline controller, and disturbance estimation based robust dynamic inversion control and sliding mode control are proposed. Compared with baseline controllers, the proposed two robust controllers not only enhance the robustness against parameter uncertainties and external disturbances, bust also improve the tracking performance.