Power Optimization And Performance Analysis Of UAV Monitoring And Anti-monitoring System

Ground monitoring equipment has been widely adopted by security agencies.However,ground monitoring is often blocked by ground obstacles,which affects the surveilling performance.UAV(Unmanned aerial vehicle)with on-demand deployment and mobility capability is more suitable for surveillance operations by security agencies.Compared with ground monitoring equipment,in general,UAV monitoring equipment has dominant line of sight communication link,and thus better monitoring channel quality.To ensure successful monitoring,UAV can move quickly to find the optimal monitoring location,and use active jamming to improve monitoring performance.Therefore,UAV legal monitoring system is of great significance for national security.This dissertation focuses on power optimization and performance analysis of UAV monitoring and anti-eavesdropping system.The main contributions are as follows:The performance analysis of legitimate surveillance system where a full-duplex UAV legitimate monitor adopts simultaneous passive surveilling and active jamming is deployed to monitor suspicious communication link between a dubious pair in the ground is performed.UAV monitor performs passive surveilling to acquire the information of the suspicious source,together with active jamming to lower the information transmission rate from suspicious source to suspicious destination.The surveilling non-outage probability of UAV monitor is evaluated.Two different scenarios for UAV,single-input single-output(SISO)UAV and multiple-input multiple-output(MIMO)UAV,are considered.For SISO UAV,the surveilling non-outage probability is derived and analyzed,and optimal jamming power is obtained.Three lowcomplexity linear beamforming schemes,transmit zero-forcing(TZF)/maximum ratio combing(MRC),maximum ratio transmission(MRT)/receive zero-forcing(RZF),and maximum ratio transmission(MRT)/ maximum ratio combing(MRC)are considered for MIMO UAV.The surveilling non-outage probability is derived and analyzed,and optimal jamming power is obtained.Simulation and numerical results validate the derivation.Optimal 3D location of the UAV monitor that maximize the surveilling non-outage probability of the UAV monitor is determined,and impact of the antenna number/angle/ radius/ height,as well as the distance of the suspicious link on the surveilling non-outage probability is analyzed.The performance analysis of legal full-duplex UAV surveillance system where ground-toground suspicious source adopts anti-surveillance technology is performed.UAV performs passive surveillance and active jamming simultaneously,and the suspicious source with multiantenna employs artificial noise to avoid being monitored.UAV monitor performs passive surveilling to acquire the information of the suspicious source,together with active jamming to lower the information transmission rate from suspicious source to suspicious destination.The surveilling non-outage probability of UAV monitoris evaluated.In order to ensure effective surveilling,two beamforming schemes,namely MRT/RZF and TZF/MRC,for MIMO UAV are considered.For two beamforming schemes,the closed-form expression for surveilling nonoutage probability is derived,and the surveilling performance is analyzed.Monte Carlo(MC)simulation validates the derivation.The optimal angle/radius/height for the surveilling nonoutage probability is determined by simulation.For different height of UAV,optimal number of receiving antennas that maximizes the probability of UAV surveilling non-outage is determined for fixed total number of antennas.The impact of artificial noise power ratio in the suspicious source and the distance of suspicious nodes,as well as the transmit power of the suspicious source and UAV on surveilling non-outage probability is analyzed.The optimal power ratio of artificial noise at the suspicious source which minimize the surveilling nonoutage probability is determined.The performance analysis of legal full-duplex UAV surveillance system where the groundto-ground suspicious destination adopts anti-surveillance technology is performed.UAV works in full-duplex mode,which performs passive surveillance and active jamming simultaneously,and the suspicious destination also works in full-duplex mode,and employs artificial noise to avoid being monitored.UAV monitor performs passive surveilling to acquire the information of the source,together with active jamming to lower the information transmission rate from suspicious source to suspicious destination.The surveilling non-outage probability of UAV monitor is evaluated.In order to ensure effective surveilling,TZF/MRC for MIMO UAV are considered.For TZF/MRC beamforming scheme,closed-form expression for surveilling nonoutage probability is derived,and the surveilling performance is analyzed.MC simulation validates the derivation.The optimal angle/radius/height for the surveilling non-outage probability is determined by simulation.The impact of the distance of suspicious nodes on the probability of surveilling non-outage is analyzed.The impact of the number of the receive and transmit antennas of the suspicious destination on the probability of UAV surveilling nonoutage is analyzed.The impact of jamming power of UAV and the suspicious destination on the probability of surveilling non-outage is analyzed.The performance analysis of legal UAV surveillance system with half-duplex suspicious relay network,where a suspicious ground source transmits suspicious messages to a suspicious ground destination through a suspicious relay is performed.UAV also works in half-duplex mode,which performs either passive surveillance or active jamming.In the first slot,the suspicious source transmits suspicious information to the suspicious relay,and then in the second slot,the suspicious relay decodes and forwards the suspicious information to the suspicious destination.Three schemes,namely first surveilling then jamming,first surveilling then surveilling,first jamming then surveilling,for MIMO UAV are compared.For three schemes,the closed-form expression for surveilling non-outage probability is dervied and analyze the surveilling performance under different system environments.The optimal angle/radius/height for the surveilling non-outage probability is determined by simulation.The impact of the distance between suspicious source and destination on the probability of surveilling non-outage is analyzed.