Abstract: The present disclosure relates to a communication system comprising a first remote control, a second remote control and a controlled device. The first remote control and the second remote control establish communication with the controlled device via a first communication link and a second communication link, respectively, so as to control the controlled device. The first remote control sends first transmission data to the controlled device, the second remote control sends second transmission data to the controlled device, and the controlled device transfers the first transmission data to the second remote control and transfers the second transmission data to the first remote control. The present disclosure further relates to a communication method and a controlled device. With the technical solutions provided herein, the remote controls communicate with each other by means of the controlled device, which makes the communication between the remote controls no longer restricted by a distance therebetween.

Abstract: A method for navigating an unmanned aerial vehicle (UAV) from an initial position of the UAV towards a base position comprises A) flying the UAV to a plurality of destination positions each having a first predetermined distance from the initial position of the UAV, wherein the plurality of destination positions correspond to a plurality of trial directions with respect to the initial position, respectively; B) detecting, for each of the plurality of destination positions, a distance from the base position to the destination position when the UAV is at the destination position, thereby to obtain a plurality of detected distances corresponding to the plurality of trial directions, respectively; C) determining a return direction of the UAV on the basis of the plurality of detected distances; and D) flying the UAV a second predetermined distance along the return direction.