基于LEO的骨干接入空间信息网络与用频策略研究
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摘要
空间信息网络利用各类空间平台来实现空间信息的实时获取、传输和处理,打破了当前多个独立系统之间资源不能共享的壁垒。立足我国空间基础设施种类繁杂、不成体系、缺少统一的通信标准、综合服务能力差、覆盖范围小的建设现状,坚持"既着眼于现有系统,又兼顾未来发展"的建设原则,在空间信息网络建设的初级阶段,设计了基于双层LEO的空间信息网络的体系架构,即将较高轨道的LEO卫星作为骨干核心网来负责骨干传输功能;将较低轨道的LEO卫星作为热点接入层来负责地面和空间业务节点的接入。同时,为未来空间信息业务提供可扩展的体系特征,譬如未来增加对GEO骨干节点的拓扑关系的考虑,从而解决空间信息网络的轨道资源问题。最后,针对空间信息网络频率资源受限的问题,提出了频率获取策略。
Space information network(SIN)utilizes various spatial platforms to achieve spacial information real-time acquisition,transmission and processing,which breaks the barrier of multiple independent systems incapable sharing resources.Based on the current situation of complex types,fragmentation,lacking of unified communications,poor integrated services and small-coverage for our national space infrastructure,this paper proposed the construction principles of not only focusing on the existing system but also taking into account the future development.A novel SIN architecture based on the double layered LEO was designed during the initial stage of SIN.The higher LEO satellites regarded as the backbone core network play the role of backbone transmission task,while the lower LEO satellites regarded as the hot access network provides access to terrestrial and space services node.Meantime,the scalable system feature is exhibited for future space information service.For example,the topological relations with future increased GEO backbone nodes are considered.Then,orbit resource shortages of SIN is effectively resolved.Additionally,frequency acquisition strategy is researched for the problem of limited frequency resources in SIN at the end of this paper.
Space information network(SIN)utilizes various spatial platforms to achieve spacial information real-time acquisition,transmission and processing,which breaks the barrier of multiple independent systems incapable sharing resources.Based on the current situation of complex types,fragmentation,lacking of unified communications,poor integrated services and small-coverage for our national space infrastructure,this paper proposed the construction principles of not only focusing on the existing system but also taking into account the future development.A novel SIN architecture based on the double layered LEO was designed during the initial stage of SIN.The higher LEO satellites regarded as the backbone core network play the role of backbone transmission task,while the lower LEO satellites regarded as the hot access network provides access to terrestrial and space services node.Meantime,the scalable system feature is exhibited for future space information service.For example,the topological relations with future increased GEO backbone nodes are considered.Then,orbit resource shortages of SIN is effectively resolved.Additionally,frequency acquisition strategy is researched for the problem of limited frequency resources in SIN at the end of this paper.
引文
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[2]JENNINGS E,HECKMAN D.Performance Characterization of Space Communications and Navigation(SCaN)Network by Simulation[C]∥Proceedings of IEEE Aerospace Conference.2008:1-9.
[3]NASA.Space Communications and Navigation(SCaN)[OL].http://www.nasa.gov/content/space-communication-and-navigation-scan-goals-and-objectives/#.Vp2BILkQh7I.
[4]FOGLIATI V.Basic Pillars for the ISICOM System Development[C]∥Proceedings of International Workshop on Satellite and Space Communications.2009:99-103.
[5]VANELLI A,CORAZZA G,LUGLIO M,et al.The ISICOM Architecture[C]∥Proceedings of International Workshop on Satellite and Space Communications.2009:104-108.
[6]SESENA J,ALFARO A,MUNOZ S.Regulatory environment for the Successful ISICOM Development[C]∥Proceedings of International Workshop on Satellite and Space Communications.2009:109-112.
[7]FOGLIATI V.ISICOM:Integrated Space Infrastructure for Global COMmunications[C]∥Proceedings of Advanced Satellite Mobile Systems.2008:13-15.
[8]GUPTA O.Global Augmentation of ADS-B Using Iridium NEXT Hosted Payloads[C]∥Proceedings of Integrated Communications,Navigation and Surveillance Conference.2011:1-15.
[9]Discover the Iridium NEXT program[OL].http://www.iridium.com/About/Iiridum NEXT.aspx.
[10]JOHNSTON B,HASLAM M,TRACHTMAN E,et al.SB-SAT Persistent Data Communication LEO Spacecraft via the Inmarsat-4GEO Constellation[C]∥Proceedings of Advanced Satellite Multimedia Systems Conference.2012:21-28.
[11]ZHANG G,ZHANG W,ZHANG H,et al.A Novel Proposal of Architecture and Network Model for Space Communication Network[C]∥Proceedings of IAF 65th International Astronautical Congress.2014:1-7.
[12]ZHANG W,ZHANG G,GOU L,et al.Hierarchical Autonomous System Based Topology Control Algorithm in Space Information Network[J].KSII Transactions on Internet and Information Systems,2015,9(9):3572-3593.
[13]ZHANG W,ZHANG G,BIAN D,et al.A Novel Space Information Network Architecture Based on Autonomous System[C]∥Proceedings of Wireless Communications and Signal Processing.2015:1-5.
[14]张威.空间信息网络中的拓扑控制理论与方法研究[D].南京:解放军理工大学,2016.
[15]国家自然科学基金委员会.空间信息网络基础理论与关键技术重大研究计划指南2015[DB/OL].(2015-04-16)[2017-03-12].http://www.nsfc.gov.cn/publish/portal0/tab38/info48284.htm.