Disturbance observer based finite time control design for reusable launch vehicle in re entry phase
In this paper, on the basis of disturbance observer, the finite time attitude tracking control scheme is designed for the reentry reusable launch vehicle (RLV)with external disturbances and model uncertainty. Based on the multiple time scale technique, the attitude model of RLV is firstly divided into a two loops structure, then the terminal sliding mode (TSM) controllers are designed for each loop. To sequel, the external disturbances and uncertainty is estimated by the disturbance observer(DOB) and the chattering problem caused by the big controller parameters of the sliding mode control can be eliminated. Stability analysis is presented in the framework of Lyapunov analysis. At last, to demonstrate the effectiveness of the proposed controller, simulations are carried out for the 6 DOF reentry model.
2016 35th Chinese Control Conference (CCC)