Research On Aircraft Ad_hoc Network Routing Protocols

With the expansion of the functions and the extension of the task, the future aircraft inevitably need to have the capacity to formation flight and cooperative engagement to achieve the objectives of the aircraft clustering. If the ad hoc network applied to aircraft networking, making the aircraft fleet to compose a multi hop, autonomous and self-organized mobile ad hoc networks, so the aircraft node can do not depend on the ground station and transmit data to each other, which will greatly enhance the overall combat capability of aircraft fleet. However, the existing ad-hoc network routing protocols cannot well adapt to the special characteristics of vehicle ad-hoc network in which the node keep high speed movement, topology is dynamic change and network security requirement is high, in order to realize the clustering of aircraft, there is an urgent requirement for routing protocols which can be applied to the aircraft.The focus of this study is the vehicle ad hoc network routing protocol, mainly including the following two aspects.Firstly, In view of higher motion speed of nodes in vehicle network and larger changes of the topology, the existing routing protocols cannot organize network quickly, converge quickly and adapt to the dynamic changes of the network topology. So a protocol based local topological stability is proposed, it is NCR_OLSR protocol. The NCR_OLSR routing protocol measures the local topological stability by introducing the rate of change of the neighbor network nodes. The better stability of node has, the easier to become MPR node which transmits the TC control message to other nodes. Meanwhile, nodes with a higher stability are more easily chosen as the next hop routing node. According to these principles, this article firstly modifies the original packets t, and then improves the MPR selection algorithm, and finally perfects the establishment and operation process of NCR_OLSR protocol.Secondly, aircrafts ad hoc network requires extreme high network safety, but the OLSR and NCR_OLSR do not have the ability to resist the wormhole attack. What is worse, wormhole attack is a very dangerous network attack which is easy to perform with huge harmfulness, specifically for ad hoc network routing protocol. Therefore, on the basis of OLSR protocol, this article added the wormhole attack detection algorithm, formed the SNCR_OLSR protocol. Mainly according to the specific implementation process of the wormhole attack and abnormal topological features, SNCR OLSR routing protocol is formed, Which can detect a suspicious neighbor nodes and further make the appropriate treatment on the basis of the determination result of suspicious neighbor nodes and pseudo neighbor nodes.Finally, using OPNET network simulation platform, we simulated the two routing protocol. The result show that,the NCR_OLSR routing protocol compared to the OLSR routing protocol with high packet delivery rate and low packet loss rate, and the NCR_OLSR routing protocol performed better than NCR_OLSR routing protocol on detecting wormhole attacks.