基于一致性时钟同步方法的天基时频同步网建模与仿真技术研究
2022,30(9):228-234
摘要：以卫星网络为核心的天基信息网络是现代通信网络的主要发展方向，卫星网络的高精度时频同步是天基信息网络正常运行的基础，也是卫星应用研究必不可少的前提条件；针对天基信息网络的时频同步问题，对基于一致性时钟同步方法的天基时频同步网建模与仿真技术进行了研究，通过相邻卫星节点建立的星间测量链路，实现了高精度时钟同步；进行了天基时频同步网建模与仿真系统的需求及功能组成的分析，完成了卫星网络场景仿真以及一致性时钟同步方法的仿真，仿真结果表明，逻辑时钟的时间偏差优于0.1 ns，相对频率偏差优于1e-10，时间间隔误差优于0.1 ns，时钟偏差优于10 ps@1000 s，阿伦方差优于1e-15@1 h。
关键词：一致性时钟同步；卫星网络；建模与仿真；亚纳秒量级；误差分析
Research on Modeling and Simulation Technology of Space-based Time-frequency Synchronization Network based on Consencus Clock Synchronization Method
Abstract：The space-based information network with satellite network as the core is the main development direction of modern communication network. The high-precision time-frequency synchronization of satellite network is the basis for the normal operation of space-based information network, and it is also an essential prerequisite for satellite application studies; Aiming at the time-frequency synchronization of space-based information network, the modeling and simulation technology of space-based time-frequency synchronization network based on consistent clock synchronization method is studied. Through the inter satellite measurement link established by adjacent satellite nodes, high-precision clock synchronization is achieved; The requirements and functional composition of the space-based time-frequency synchronization network modeling and simulation system are analyzed, and the satellite network scenario simulation and the simulation of the consistent clock synchronization method are realized; The simulation results show that the time error of logical clock is better than 0.1 ns, the relative frequency deviation is better than 1e-10, the time interval error is better than 0.1 ns, the time deviation is better than 10 ps@1000 s, and the Allen variance is better than 1e-15@1 h.
Key words：consencus clock synchronization; satellite network; modeling and simulation; sub-nanosecond level; error analysis
收稿日期：2022-07-07
基金项目：国家自然科学基金项目(62001491)
