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On the Secrecy of UAV Systems With Linear Trajectory

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Document pages: 27 pages

Abstract: By observing the fact that moving in a straight line is a common flyingbehavior of unmanned aerial vehicles (UAVs) in normal applications, e.g., powerline inspections, and air patrols along with highway streets borders, in thispaper we investigate the secrecy outage performance of a UAV system with lineartrajectory, where a UAV ($S$) flies in a straight line and transmits itsinformation over the downlink to a legitimate receiver ($D$) on the groundwhile an eavesdropping UAV ($E$) trying to overhear the information deliverybetween $S$ and $D$. Meanwhile, some information is delivered to $S$ over theuplink from $D$, such as commanding messages to control $S$ s detectingoperations, which can also be eavesdropped by $E$. The locations of $S$, $D$,and $E$ are randomly distributed. We first characterize the statisticalcharacteristics (including cumulative distribution functions and probabilitydensity function) of the received signal-to-noise ratio over both downlink anduplink, and then the closed-form analytical expressions for the lower boundaryof the secrecy outage probability of both downlink and uplink have also beenderived accordingly. Finally, Monte-Carlo simulations are given to testify ourproposed analytical models.

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