Research On Emulation Technology Based On Virtualization For The Space-ground Integrated Network

As a national strategic infrastructure with great strategic significance,the SGIN(spaceground integrated information network)plays an important role in safeguarding national interests and promoting economic development.The goal of the SGIN is to build a secure,integrated,and reconfigurable air-to-ground information application system that supports unified planning and management.Due to the large scale of the system and the variety of protocols,it is necessary to construct a corresponding emulation platform to strictly evaluate and verify the network architecture and protocols of the SGIN.At present,the related research on satellite network emulation mainly focuses on three aspects: theoretical model,digital simulation based on discrete event and network emulation based on virtualization technology.The paper proposes a high-performance emulation technology for the SGIN.Based on this,the dynamic linkage emulation technology for the SGIN is proposed.Finally the SGIN emulation management control system is introduced.Combined with specific cases,the entire SGIN emulation platform is verified.The main research contents of this paper include:1)A high-performance emulation technology for the SGIN(SGIN-HPET)for the SGIN is proposed,which integrates satellite scene precision simulation technology and SDN-based satellite link emulation technology.In order to overcome shortcomings of the existing emulation technologies of satellite links,dynamic differential compensation is used to realize high-fidelity emulation of satellite link delay.The high-throughput routing protocol is deployed in the virtualized satellite nodes,and automatic configuration of the satellite protocol is supported,which significantly improves the throughput of links between the space-based backbone networks,and can meet the requirements of the satellite laser link emulation.By emulating a satellite network scenario,it is verified that SGIN-HPET can support realistic emulation of satellite link visibility,delay,bit error rate and bandwidth;Compared with current mainstream methods,SGIN-HPET emulation of link delay has higher fidelity,it can also support high-throughput emulation of satellite routing nodes.2)Based on SGIN-HPET,dynamic synchronization emulation technology for the SGIN(SGIN-DSET)is proposed.SGIN-DSET combines the advantages of virtualization of OpenStack cloud platform with the accurate measurement of satellite orbits of STK simulation software to achieve seamless interconnection and supports real-time emulation of large-scale satellite networks.SGIN-DSET implements forward emulation of SGIN through satellite computing model-driven simulation network,and the emulation network can reverse-control the satellite computing model.The results of two emulation scenarios show that SGIN-DSET can support static and dynamic emulation of satellite network and satellite link characteristics.By emulating the satellite orbit maneuvering scenario,it shows that SGIN-DSET supports the reverse regulation of the satellite computing model;analyzing the positioning accuracy of the space-based access constellation in the SGIN and the global coverage of the space-based backbone constellation,which proves that the overall design can meet the design needs.3)Based on the research of SGIN-HPET and SGIN-DSET,the SGIN emulation management control system is designed and implemented.The system supports the automatic deployment of satellite emulation network on the cloud platform and the automatic recovery of network resources according to the network topology description file.The availability of the system is verified by building,emulating,and retrieving a large-scale satellite network emulation environment.