Research On Security Optimization And Design Of Simulation Platform For The Network Of UAV System

With the continuous advancement of science and technology,Unmanned Aerial Vehicle(UAVs)have been widely used in the fields of military and civilian due to their small size,strong maneuverability and high flexibility.On the one hand,UAVs can be used as auxiliary communication equipment to provide temporary short-term communication for special areas.At this level,how to achieve the security of wireless communication through UAVs is worthy of in-depth study;on the other hand,when UAVs are operated illegally,it can bring security issues to the country and society,and how to effectively intercept and control illegally invaded UAVs from the perspective of defenders has also received extensive attention from researchers.This thesis mainly studies the security issues of UAV system networks from these two perspectives.This thesis first studies how to improve the security of UAV wireless communication when it is used as a wireless mobile relay.This thesis considers a new research scenario of cooperative communication between dual UAVs when the location of the eavesdropper on the ground is unknown from the perspective of the physical layer security of the UAVs.An optimization problem of how to maximize the average security rate of the system under multiple constraints including information causality,flight trajectory,and transmission power is proposed.The optimization problem proposed in this thesis is non-convex,and it is very difficult to solve it directly.This thesis uses block coordinate descent algorithm and successive convex approximation technology to decouple the original problem into three solvable sub-problems,and designs an iterative algorithm for joint optimization of flight trajectory and transmission power,which maximizes the average security rate of the system.We verify the feasibility of this method through numerical simulation.Secondly,from the perspective of UAV cyber security,this thesis studies the problem of interception and defense of UAVs which is illegal intrusion through cyber attacks.We independently build an experiment simulation platform of UAV wireless cyber security that can conduct experiments of cyber attacks on UAVs.The platform mainly includes the UAV system based on Wi-Fi communication,the wireless Wi-Fi communication system designed with the Raspberry Pi,and two computers equipped with related experimental environments.Through the full analysis and reproduction of the MAVLink protocol,this thesis uses the vulnerability of the wireless communication between the UAV and the ground control station to design attack strategies of man-inthe-middle attack,denial-of-service attack and hijacking attack for UAVs that use WiFi communication.We successfully implemented these attack experiments on the experimental platform,and achieved a perfect effect of defense and interception against illegally invaded UAVs.