Hovering Control for Automatic Landing Operation of An Inspection Drone to A Mobile Platform

This paper investigates the hovering control problem of a drone on a 6-DOF mobile platform. An inner-outer loop strategy based on high-gain observer is presented. In the outer loop, the high-gain observer is designed to estimate the states of the drone such that its velocity and acceleration measurements are not necessary, and then a nested saturation controller is designed. In the inner loop, a hybrid controller which can be effectively used for avoiding unwinding phenomenon is applied to regulate the attitude of the drone. Finally, a simulation example is used to demonstrate the effectiveness of the proposed control method.