New robust disturbance rejection control method for reusable launch vehicle

A new robust disturbance rejection controller scheme integrating a main controller and a compensator for reusable launch vehicle reentry attitude control is proposed. The main controller, using nonlinear dynamic inversion technique, is designed for high performance of the nominal system. The compensator, based on nonlinear extended state observer, built an additional control signal to cancel the disturbance and enhance the robustness of the closed loop system. Stability of the whole system is analyzed. Feasibility and validity of the new controller is demonstrated with RLV simulation examples.