Analysis And Research On Satellite Routing Mechanism Based On AODV

With the development of globalization,the terrestrial communication network has been unable to meet the needs of our nation.So satellite communication technology came into being.Since the 1990s,satellite communication technology has been rapidly developed,and the scale of satellite network has gradually expanded.However it has the characteristics of strong node dynamics,frequent topology change,poor scalability and low utilization of node link resources.In order to realize collaborative work in the satellites,efficiently networking,which can complete a variety of complex space tasks efficiently,is needed between satellites.This paper is supported by The National 863 Project:Key Technologies and Demonstrations of Future Integrated Network(No.2015AA015702),which is proceeding in our lab.The AODV(Ad-Hoc On-demand Distance Vector Routing)on-demand routing protocol is applied to the distributed satellite network to access to the interplanetary network in order to realize the Integrated Space-Air-Ground communication network.And a bandwidth assurance algorithm based on AODV routing protocol for the formation flight satellite network is proposed as furthermore step.Firstly,this paper introduces the distributed satellite system and a variety of routing protocols.Constellation,cluster and formation flight satellites of distributed satellite system are analyzed,and the model of formation flight satellites is studied emphatically.And then,CGR connection graph routing protocol which is applied to the space delayed tolerant networks is studied.And the proactive and reactive routing protocols which are used in the terrestrial Ad-Hoc wireless network are investigated.The principles and applicable network scenarios of proactive and reactive routing protocols are analyzed.Furthermore,two improved AODV routing protocols based on bandwidth with the disadvantage of not taking into accout the absence of a qualified path in the network are researched.Secondly,an extended model based on Interferometric CartWheel Formation Flight Satellites is proposed in this paper.In view of the low utilization of node link bandwidth resources in the formation flight satellite networks and the wasting of bandwidth resources of the current improved AODV routing protocol based on bandwidth,this article improves the AODV routing protocol.Then the improved method is expounded in detail,including bandwidth parameter extraction,the improvement of message frame and routing table involved in route discovery.Then the routing mechanism of the improved routing protocol is described detailedly,includeing the message processing,and the implementation method.At last,the experiment scene of the integrated Space-Air-Ground network is established in the laboratory environment.AODV routing protocol is applied to the distributed LEO satellites network to test the experiments of neighbor discovery,route discovery,route maintenance and gateway function.And then combined with the CGR routing protocol,the distributed LEO satellite are connected to the interplanetary network to realize the integrated Space-Air-Ground network.Then original AODV,improved AODV and QVAODV routing protocol are applied to the formation flight satellite network model which is proposed by this article.The destination node's throughput results that are obtained by changing the experimental parameters of the three groups show that when the improved AODV routing protocol based on bandwidth is applied in the formation flight satellite networks,it can reduce the impact of link bandwidth on the data transmission and make full use of the limited bandwidth resources of satellites network.