Robust control of missiles with reaction jets using adaptive sliding mode and control allocation

A robust control scheme for high angle of attack tracking of one class of missiles with reaction jets is presented. The control scheme contains an adaptive SMC controller and a control moment allocator. In the former, an adaptive compensator based on radial basis function neural network is used to eliminate chattering by compensating the missile disturbances and uncertainties. The latter is designed to coordinate the fins and the reaction jets. The main advantage of our proposed robust control scheme is that no knowledge of the boundaries of the system uncertainties and external disturbances is required in advance; meanwhile, the chattering phenomenon that frequently appears in conventional sliding mode control systems is also eliminated without deteriorating the system fast-response characteristic and robustness. Besides, the adaptive compensator contains only one parameter updated online. With Lyapunov stability theory, the closed-loop system is proved stable and convergence properties of the system are assured. Numerical simulation results illustrate the effectiveness of the proposed robust control scheme.