Reentry Attitude Two-Loop SMC Control and Rudder-Nozzle Blending Selection Allocation of RLV

This paper develops a RLV reentry attitude control method by using the sliding mode control(SMC)theory.The controller utilizes double-loop SMC scheme and provides robust,de-coupled tracking of both the angular velocity and the shuttle orientation angles.And pointing to the hybrid controlling characteristic of the aerodynamic surfaces and reaction control system of the RLV,allocating the control torque commands into the actuators such as the aerodynamic surfaces and reaction control system by using the optimal control selection allocation algorithm.Simulation of the RLV reentry attitude controlling demonstrates robust,de-coupled tracking performance and its validity.