时间传递链路闭合钟差处理方法与性能分析  

Different time transfer links closed-loop clock processing methods and performance analysis

作　　者：陈亮[1] 展昕 王崇阳[1] 郭晓松 CHEN Liang;ZHAN Xin;WANG Chongyang;GUO Xiaosong(The 54th Research Institute of China Electronics Technology Group Corporation,Shijiazhuang 050081,China;The 722th Research Institute of China Shipbuilding Industry Corporation,Wuhan 430205,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,石家庄050081 [2]中国船舶重工集团公司第七二二研究所,武汉430205

出　　处：《导航定位学报》2024年第3期55-62,共8页Journal of Navigation and Positioning

摘　　要：守时实验室和全球卫星导航系统(GNSS)维持的时间基准都通过不同溯源链路溯源至UTC(k),k为实验室代号。目前主流溯源方式包括光纤时间传递、卫星双向时间传递和GNSS共视时间传递。通过对不同溯源链路构造闭环钟差模型,利用间接平差修正各溯源链路钟差,消除了不同链路中存在在系统差和周期项等误差,提升了时间传递精度。采用5个时频站中8条独立不同溯源链路的钟差实测数据的对算法进行验证,结果表明:由于存在未消除空间误差的影响,卫星双向时间传递和GNSS共视时间传递在长基线条件下都存在明显的周期项,通过对溯源链路的平差修正,消除了溯源钟差不闭合的问题。通过对钟差的二次多项式拟合得到的残差计算,GNSS共视时间传递噪声由0.43ns降低至0.25 ns,卫星双向时间传递噪声0.21 ns降低至0.14 ns,光纤时间传递噪声由0.18 ns降低至0.12 ns。通过提升各溯源链路的时间传递精度,有效地改善了各时间基准的服务能力。The time reference maintained by both the punctual laboratory and the global navigation satellite system(GNSS)is traced to UTC(k)through different traceability links,with k being the laboratory code.At present,the mainstream traceability methods include optical fiber time transfer,Two-way satellite time reference and GNSS common view time transfer.The closed-loop clock difference model is constructed for different tracing links,and the clock difference of each tracing link is corrected by indirect adjustment,which eliminates the errors of system difference and period term in different links,and improves the accuracy of time transmission.The algorithm is verified by using the measured clock difference data of 8 independent and different tracing links in 5 time-frequency stations.The results show that,due to the influence of uneliminated spatial errors,both satellite bidirectional time transfer and GNSS co-view time transfer have obvious period terms under long baseline conditions.By correcting the adjustment of the tracing link,the problem of unclosed tracing clock difference is eliminated.The GNSS common-view time transfer noise is decreased from 0.43 ns to 0.25 ns,the satellite bidirectional time transfer noise is decreased from 0.21 ns to 0.14ns,and the optical fiber time transfer noise is decreased from 0.18 ns to 0.12 ns by calculating the residual from the quadratic polynomial fitting of the clock difference.By improving the time transmission accuracy of each tracing link,the service capability of each time reference is effectively improved.

关 键 词：时间基准 时间频率传递 共视 残差 平差 

分 类 号：P228[天文地球—大地测量学与测量工程]