Securing wireless relaying communication for dual unmanned aerial vehicles with unknown eavesdropper

Abstract Unmanned aerial vehicles (UAVs) face a lot of security challenges due to the openness of their wireless communication. In this paper, we investigate how to improve the security of wireless communication when the UAV is utilized as a wireless relay. We consider a new scenario where the dual UAVs are employed cooperatively to transmit confidential information and an eavesdropper whose actual position is unknown attempts to eavesdrop on the information illegally. We propose an optimization problem for the average secrecy rate under multiple constraints. The optimization problem we proposed is non-convex and complicated. We design an iterative algorithm that jointly optimizes the trajectories and transmit power to make the average secrecy rate maximized via the block coordinate descent and successive convex approximation techniques. The feasibility of this method is verified by numerical simulation.