Inverse dynamic attitude control for re-entry vehicle based on output redefinition

Internal dynamics occurs in the lateral/directional motion of re-entry vehicle with two body flaps under the condition of high angle of attack. A method of inverse dynamic control based on output redefinition technique was presented. The output-redefinition technique was used to locally stabilize the zero dynamics. A pole placement strategy enhanced the robustness of the zero dynamics and then provided feedback linearizes of the output-redefinition system to design the inverse dynamic controller. Simulation results show that the zero dynamics is stable and the tracking performances of attack angle and bank angle are very well while sideslip angle is stabilized to zero. The simulation results compared with reaction control system (RCS) control demonstrate that stable attitude control can be realized only by two aerodynamic control surfaces and the complexity of the vehicle structure can be reduced meanwhile the payload can be incerased.