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The primary focus of this work is to design and implement a robust automatic flight control system for a smallscale unmanned helicopter. A comprehensive nonlinear model for the unmanned system, which is constructed by our research team at the National University of Singapore, is first derived and presented. Based on its linearized model, a robust automatic flight control system is then designed by employing Hinfin control and dynamic inversion techniques. Design specifications for military rotorcraft set for the US army aviation are adopted throughout the whole process to guarantee a top level performance. The result of actual flight tests shows our design is very successful. The unmanned helicopter system is capable of achieving a top level performance in accordance with the military standard in most of the categories under examination.