Secrecy Outage Probability and Jamming Coverage of UAV-enabled Friendly Jammer

In this paper, we examine the secrecy performance of an unmanned aerial vehicle (UAV) equipped with an air-toground jammer and a ground communications network comprising a legitimate transmitter-receiver pair and an eavesdropper. We consider two scenarios: stationary UAV jammer and mobile UAV jammer. In the first scenario, we derive the secrecy outage probability (SOP) of the legitimate link for fixed distances between the UAV jammer, legitimate nodes and eavesdropper. Based on the SOP, we evaluate the jamming coverage of the UAV jammer and propose a two-step optimization problem to determine the optimal UAV location when the eavesdropper location is unknown. In the mobile UAV scenario, we design a new algorithm to provide jamming coverage to a given target area with minimum number of stopping points. Simulation and analytical results show that a UAV jammer can significantly improve the jamming coverage compared with a ground jammer.