Robust Roll Autopilot Design for Tactical Missiles

摘要

In this paper, a robust roll autopilot based on the extended state observer technique is proposed. The autopilot isnrobust to uncertainties, external disturbances, the airframe flexibility, and fast unmodeled sensor lags. The externalndisturbances and the parametric uncertainties in the roll loop are treated as a composite disturbance and thenextended state observer is used to estimate the composite disturbance and the states of the system in an integratednmanner. The estimated disturbance and the estimated states are used to robustify linear quadratic regulatornautopilots designed for nominal systems. The closed-loop stability of the observer-controller combination is proved.nSimulation results are presented to demonstrate the efficacy of the extended state observer in estimation of thenuncertainties and the states, and in meeting the objectives of the design. Lastly, the proposed design is compared withnsome well-known designs reported in the literature.