Time Synchronization Service Oriented Topology Aggregation Model of Space Information Network
YU Baoguo BAO Yachuan WEI Haitao
(State Key Laboratory of Satellite Navigation System and Equipment Technology, Shijiazhuang 050081, China)
(The 54th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang 050081, China)
Abstract：The trend of heterogeneous node and functional diversification is presented in the development of space information network. The synchronization of network nodes is the technical foundation of task coordination of network nodes. The characteristic of time synchronization service of space information network is analyzed in this paper and the error model of multi-hop relay time synchronization is given. The concept of clock offset relative invariance is proposed based on the characteristic of non-real-time time synchronization, and a novel space information network topology aggregation model is given for time synchronization service. Differing from normal communication-service-oriented network models, the constraint condition of the model establishment is the performance of node clock and the time synchronization link, and the characteristic and requirement of time synchronization service is concerned. Simulation of space information network time synchronization is made according to the model. In the process of multi-hop relay time synchronization based on the model, less routing and linking number is needed. The link resource consumption is reduced, and the time synchronization precision is improved.
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YU Baoguo, BAO Yachuan, WEI Haitao. Time Synchronization Service Oriented Topology Aggregation Model of Space Information Network. JEIT, 2017, 39(12): 2929-2936.
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