Research On The Improvement Of AODV Routing Protocol In Ad Hoc Network Of UAVS

With the development of science and technology and the progress of technology,UAVs have been more widely used in reality,playing an important role in military reconnaissance and attack,agriculture,aerial photography,rescue and other fields.Multiple UAVs form a cluster to jointly execute and complete tasks to improve the success rate of tasks.Ad hoc network technology is applied to the cluster composed of UAVs,which provides reliable guarantee for multi-UAVs to work together,and routing protocol is the key technology in UAVS Ad hoc network.This thesis focuses on the Ad Hoc On-Demand Distance Vector Routing(AODV)protocol in UAV Ad hoc networks.The work of this thesis follows:1.Aiming at the problems such as large delay,fast node energy consumption,network congestion and reduced packet arrival rate of AODV protocol in a network environment with high node density,an improved routing protocol based on the number of neighbor nodes and node location information is proposed on the basis of the traditional AODV routing protocol.AODV-Changed by the number and location of adjacent nodes(AODV-C)protocol is selected according to the number and location of adjacent nodes,and residual energy value.Limit the number of forwarding nodes and the forwarding area of packets.Simulation results in Network Simulator Version2.35(NS-2.35)software show that:The improved protocol can improve the packet delivery rate,routing stability and reliability,shorten the average end-to-end transmission delay,reduce the network load,and better adapt to the network environment with highn node-density.2.In order to solve the problems such as large delay,network congestion and network instability caused by flood forwarding of AODV protocol in a network with a large number of nodes,based on the traditional AODV routing protocol,AODV-improved by the Number of adjacent nodes and the Longer distance between nodes(AODV-NL)routing protocol is proposed.The improved routing protocol is based on the number of neighbor nodes and the distance between the neighbor nodes in the network,and limits the forwarding of the neighbor nodes.The improved AODV-NL routing protocol is simulated by NS-2.35.The simulation results show that compared with AODV routing protocol,the improved routing protocol has less network overhead,higher packet delivery rate and lower average end-to-end delay,and improves the throughput of the network,so that the UAV Ad hoc network has better network performance.To sum up,compared with AODV routing protocol,the AODV-C routing protocol proposed in this thesis can provide good network performance and reliable communication for UAV Ad hoc networks,especially in the network environment with high density of UAV nodes,through screening neighbor node forwarding,the delay increase and network congestion caused by flood forwarding of AODV protocol in the network environment with high node density are avoided.Compared with AODV routing protocol,the proposed AODV-NL routing protocol has lower network overhead,higher packet delivery rate and better network performance.