Research Of Multiple Uavs Cooperative Secure Communication Strategy

UAV has been widely used in many fields such as military, rescue, and investigationbecause of its many advantages. Undoubtedly, it will be get more extensive application in thefuture. The ability of high efficiency and real-time is incomparable when Multi-UAVperforming tasks of collaborative target searching and attacking. So a network composed ofmulti-UAV is required. The multi-UAV network has many characteristics such as strongdynamic, rapid topology changes, and nodes joining in or leaving the network continually.Therefore, Mobile Ad Hoc Network is the most suitable networking technology forestablishing multi-UAV network.The current state of multi-UAV network research is analyzed in the paper, then theproblem of secure communication between multi-UAV network is proposed and solved by thealgorithm. The routing algorithm is improved to solve the communication performance. Themain work is as follows:Aiming at the secure communication problems between multi-UAVs caused by wirelesssignal strength increasing, a wireless communication model and UAV dynamic model isestablished. The UAV communication range is further narrowed by the application ofimproved artificial fish-swarm algorithm (IAFSA). By taking dynamic parameters as adaptivevision’s coefficient and introducing virtual ocean currents into the artificial fish algorithm(AFSA), the drawback of slow convergence speed and more iteration has been made up bythe IAFSA. It is proved by the simulation experiments that compared to AFSA, IAFSA hasthe advantage of fast convergence rate and less iteration when solving the problem of multi-UAVs secure communication. Additionally, the overall communication range has also beennarrowed by the IAFSA.In the routing protocols, the optimized link state protocol (OLSR) is suitable for mobilead hoc networks in which nodes moving not so fast, but it is difficult to meet high-speedmobile UAVs. In order to meet the needs of high-speed mobile nodes in the multi-UAVscooperative flight environment, OLSR is improved according to the movement information in the process of node moving, the selection and searching strategy of the MPR(Multi-PointRelay) is improved by using the three parameters, such as node position information, lastaccess time, and the nodes connection. OLSR protocol based on movement aware is obtainedin multi-UAVs environment. Through comparing the influence of OLSR and improved OLSRbased on three different parameters weights, simulation experiments are used for analyzingthe impact to communication performance. It is given that node position information is themost important to communication performance.The results of the experiment show that the improved algorithm and routing protocol arethe better strategy to solve the problem of secure communication between multi-UAVnetwork and they are the preliminary program for multi-UAVs cooperative securecommunication strategy.