Keywords: Robust Control, Aerospace Systems, Simulation
Abstract: Based on Coefficient Diagram Methods (CDMs), a polynomial-control scheme for air-to-air missiles is proposed. According to the analysis of CDM-based polynomial control theory and missile dynamics, two overload-loop controllers with different structures for air-to-air missiles are designed. First, the structure and order of the controller and its corresponding characteristic polynomial of the closed-loop control system are defined following the coefficient diagram. Then, parameters of the polynomial are determined based on the desired control specifications. Numerical simulation studies for different controllers under various conditions, including the variation of aerodynamic parameters, different controller structures and output disturbances, are implemented to explore the characteristics of different control systems. Simulated results verify that the controller designed via CDMs has better robustness in comparison with the traditional three-loop autopilot.