Compound control systems design for KKV based on the theory of adaptive approximate variable structure

A robust controller design method for high-maneuverable kinetic kill vehicle (KKV) whose attitude is controlled by combining aerodynamic tail fins and direct force is presented in this paper, which is a new algorithm based on adaptive approximation variable structure control (AAVSC) theory. Using this approach chatting problem which is due to the presence of infinite frequency switching function can be solved basically. In addition, the boundaries of uncertainties and disturbances, whose deterministic structures are known exactly, can be obtained easily by using the technology of the on-line identification, which will make the compound control systems remain stable. Theoretical analysis and numerical simulation results show that adaptive approximation variable structure control law is robust against parameter perturbations and disturbances. Due to the effect of direct force, the response time can be dramatically shortened; therefore, the rapid response requirements for KKV can be met.