摘要
利用北斗组网星座资源,将导航体制星间链路技术应用于星地时间同步是一种较好的远程高精度时间传递方法。星地时间同步通过双向单程测量能够抵消大部分信道误差,从而提高测量精度,但仍存在因部分上下行路径不一致所引起的残留误差,影响最终时间同步性能。本文主要介绍星地时间同步的基本原理,给出时间同步过程中主要误差修正方法,重点分析轨道先验信息对时间同步性能的影响,并利用不同精度的轨道对星地实测数据进行分析和验证。结果表明,采用北斗广播星历与精密星历解算的星地钟差拟合残差RMS值均优于0.1 ns,当轨道信息叠加一定程度的随机误差时,通过平滑处理的方法可以进一步提高时间同步精度。本文可为星地实现高精度时间同步提供一定的技术参考和积累。
It s a better remote high-precision time transfer method that applies the navigation system inter-satellite link to the satellite-ground time synchronization by using the BDS.The satellite-ground time synchronization can offset most of the channel errors through two-way measurement,then improve the measurement accuracy,but there are still some residual errors caused by the inconsistency between upstream and downstream paths,which will diminish the accuracy of time synchronization.This paper introduces the basic principle of time-synchronization,gives the main error correction methods in the process of time-synchronization,focuses on the influence of orbit a priori information on the time-synchronization performance,analyzes and verifies the actual time-synchronization data using different precision orbits.The results show that the RMS values of the residuals of the satellite-ground clock difference fitting solved by using BeiDou broadcast ephemeris and precision ephemeris are better than 0.1 ns,and the time synchronization accuracy can be further improved by smoothing when the orbit data are superimposed with a certain degree of random errors.The research and analysis in this paper can provide some technical reference and accumulation for the realization of high-precision satellite-ground time synchronization.
作者
陈晓锋
白燕
郭燕铭
王荣
彭思琦
CHEN Xiaofeng;BAI Yan;GUO Yanming;WANG Rong;PENG Siqi(National Time Service Center,Chinese Academy of Sciences,Xi an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《测绘通报》
CSCD
北大核心
2023年第9期35-39,共5页
Bulletin of Surveying and Mapping
基金
国家自然科学基金(11873009)。
关键词
星间链路
星地时间同步
双向测量
误差修正
轨道信息
inter-satellite link
satellite-ground time synchronization
two-way measurement
error correction
orbit information
