ABSTRACT

The quadrotor is a new unmanned air vehicle (UAV) that possesses the following characters: vertical takeoff and landing (VTOL), multi-rotor and so on. Compared with fixed wing vehicles, the quadrotor can take off in a narrow space, achieve to hover, fly upside and down. Because of the high maneuverability, it fits in a wide application range involving extreme low-altitude detection, interference, surveillance, and aerial photography in rigorous environment, and has a promising application whatever in military and civil field[1-2].