Abstract: Micro-quadrotors have wide applications in the areas of military use, civil use and scientific research due to their tiny size, agility and portability. However, miniaturization of the UAV reduces the space of energy storge, leading to loss of endurance and deterioration of deployment performance. Perching maneuvering, originating from birds perching, is a hot topic for exploring the solution for extending the endurance of micro quadrotors. This method aims to take the advantage of maneuverability to achieve perching the quadrotor on the vertical surface with the help of perching mechanism. When perching, the interaction force from the vertical surface can afford the gravity of quadrotor, and there is no need to maintain the aerodynamics. Therefore, motors can be turned off, and the energy consumption would be much less than that in flight. Perching maneuvering involves complex problems such as motion control. In this paper, perching control is solved by trajectory generation and track control. First, a dynamics model is built to describe the motion of the perching quadrotor, and the model is further simplified into a longitudinal model. Then, open-loop trajectory is generated and the initial state is set with reference to the perching restrictions. Finally, the geometry control method is applied to achieve track control, and the method is also modified to make the track more precisely. Simulink experiments verify the effectiveness of the proposed method.

Key words: micro-quadrotor, endurance extension, perching on vertical surface, trajectory planning, track control