Research On Routing Protocol Of Civil Aeronautical Ad Hoc Networks Based On Geographic Location Information

Recent years, the global aviation industry has developed rapidly, which puts forward higher requirement to the civil aviation communication. Meanwhile, broadband data communication is becoming a tendency in the domain of civil aviation. For now, airliners can be connected to the Internet mainly through the base station and satellites, which suffers limited base station, great delay and high cost. While, aeronautical ad hoc network broadband communication technology is widely concerned by many scientific research institutions and researchers. Since aeronautical ad hoc network has the characteristics of high dynamic, large scale, low node density, limited bandwidth, the traditional mobile ad hoc network routing protocols don't work anymore. Therefore, it is of great significance to design an effective and reliable routing algorithm aimed at civil aviation communication.This paper takes insight into the traits of aeronautical ad hoc network, sums up domestic achievements on aeronautical ad hoc network and lucubrates the geographic routing protocol. Based on the greedy perimeter stateless routing protocol(GPSR), an improved geographic routing protocol based on Location Prediction(IGRLP) has been put forward in this paper. The main work is as follows:According to the traits of highly dynamic network topology, IGRLP protocol improves the neighbor node table maintenance mechanism as well as the convergence of the routing protocol. Traditional GPSR protocol adopts the beacon mechanism to maintain the neighbor node table, it will face a serious location failure problem in short time due to the high mobility of nodes and reduce the routing reliability. To solve this problem, IGRLP protocol uses link lifetime to delete the expired nodes, and then updates the position of neighbor nodes by Location prediction algorithm. After that the neighbor node table can be flexibly adjusted in time, so as to improve the accuracy of the routing decision.Based on the motion law of aircraft nodes, a routing selection strategy based on geographic location and movement direction is designed to enhance the robustness of the routing in high dynamic networks. The greedy algorithm of GPSR takes the shortest Euclidean distance as the measurement standard, which is easy to cause the link break in highly dynamic networks. Besides, the single routing metric can't be aware of the change of topology, where a mobile node may blindly forward data packets. In order to establish stable communication path in civil aeronautical communication networks, IGRLP protocol combines the node position and velocity direction as the routing metric.Design and realize. First, design the packet format and neighbor nodes table. Then set up civil aviation communication scenario and implement simulation experiments on the NS2 platform. Results show that in the civil aeronautical ad hoc network, improved IGRLP protocol can obviously improve the packet delivery ratio, and has better routing reliability and dynamic topology adaptability.