Disturbance-observer-based dynamic inversion tracking control for a hypersonic vehicle

A dynamic inversion controller (DIC) is designed firstly to track control commands of 100-ft/s step velocity and 2000-ft step altitude for an air-breathing hypersonic vehicle in this paper. On the basis of first step, the influence of different disturbances and parametric uncertainties is analyzed on velocity response and altitude response, so the main disturbances are found. Then a non-linear disturbance observer (NDO) is presented to estimate and compensate the main disturbances. Finally, DIC based on NDO is designed, which is a compound of DIC and NDO. And simulation studies show that the controller based on NDO is robust and meets the performance requirements in presence of disturbances and uncertainties.