Observer-based adaptive sliding mode control and fuzzy allocation for aero and reaction jets’ missile

Abstract

In this article, a novel control scheme is proposed to solve the problem of robust and fast tracking control for the longitudinal model of a dual-control missile steered by a combination of aerodynamic fins and reaction jets in the presence of model uncertainties and external disturbances. The control scheme contains two aspects, one is the observer-based adaptive sliding mode control law of the control moment and the other is the fuzzy allocation method which assigns the control moment to the fins and the reaction jets. The main contributions of the article are as follows: (1) to compensate the disturbances and uncertainties on the sliding mode surface and enhance the system robustness, an observer-based sliding mode surface is designed; (2) an adaptive sliding mode control scheme is proposed by introducing an adaptive term derived from radical basis function network, which does not require knowledge of the bound of the system uncertainties and external disturbances. Meanwhile, it eliminates the chattering phenomenon without deteriorating the system fast-response characteristic and robustness; (3) a control-moment allocator based on fuzzy reasoning is designed to make the system respond fast while avoiding wasting of the reaction jets. Simulation results demonstrate that the proposed control scheme is effective in improving control robustness and response rapidity.