双向比对高精度物理时间同步方法

提出一种面向未来卫星在轨应用的闭环物理高精度时间同步方法。比较了所提方法与其他时间同步方法的区别与优势，建立了远程系统时间同步基本模型与误差传递模型，基于双向测距和时间传递技术分析了高精度钟差获取原理，给出了时钟调整环路的时域频域参数依赖关系。完成了高精度时间同步地面试验系统构建，测试了开环非调钟状态下钟差测量精度误差、闭环调钟状态下时间同步准确度误差以及长时运行情况下的时间同步监测结果。测试结果表明，该方法能够实现优于1 ns量级的时间同步，为高精度时间同步技术研究提供了新的途径。

High accuracy physical time synchronization method based on two-way comparison

A closed-loop physical high accuracy time synchronization method for the future orbit-application of satellite is proposed. Differences and advantages of the proposed system are compared with other time synchronization methods. The basic time synchronization model and error propagation model for remote systems are built. Based on the two-way range measurement and time transfer technology, the principle for obtaining high accuracy clock bias is analyzed. The dependence between time and frequency domain parameters for clock adjustment loop is given. A high accuracy time synchronization system for ground experiment is constructed. The clock bias measurement precision under open-loop non-clock adjustment status, time synchronization accuracy under closed-loop clock adjustment status, and long term time synchronization monitoring results are given. The experiment results show that the accuracy of proposed time synchronization method is superior to 1 ns, providing a new method for studying high accuracy time synchronization.