The invention discloses a three-mode aircraft based on a ground effect and a control method of the three-mode aircraft. The aircraft integrates three
modes of vertical take-off and landing, ground effect cruising and
fixed wing high-speed cruising, and efficient
mode switching is achieved through aerodynamic
layout optimization and self-
adaptive control. And an airfoil profile geometric parameter self-adaptive adjustment technology is adopted, so that the flight performance of a ground-effect area is enhanced. According to the control method, adaptive PID,
sliding mode control and LQR algorithms are integrated, and a hierarchical control architecture is constructed. And the LQR controller realizes
optimal trajectory tracking based on the aerodynamic model in the high-speed
cruise stage. A differential control strategy is adopted for each
modal characteristic, and accurate control over the height and the speed is achieved. And through cooperative adjustment of the
propeller angle and power, it is guaranteed that
mode switching is stable and rapid. The problems that a traditional aircraft is low in mode conversion efficiency, insufficient in ground effect utilization and the like are solved, and the method has the advantages of being high in
interference resistance, high in stability and wide in application range and is suitable for various low-altitude application scenes.