NTSC时频比对中的Galileo E3总时延校准  

Galileo E3 Total Time Delay Calibration in NTSC Time and Frequency

作　　者：郭栋 董绍武[1,2] 武文俊 王威雄[1] 宋会杰 王翔 GUO Dong;DONG Shao-wu;WU Wen-jun;WANG Wei-xiong;SONG Hui-jie;WANG Xiang(National Time Service Center,Chinese Academy of Sciences,Xi'an 710600;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院大学天文与空间科学学院,北京100049

出　　处：《天文学报》2023年第5期68-78,共11页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(11703030);中国科学院西部之光项目(XAB2021YN22)资助。

摘　　要：为了提升时间传递链路的可靠性,国际权度局(Bureau International des Poids et Mesures,BIPM)自2020年起将Galileo时间比对正式作为UTC(Coordinated Universal Time)计算的备份链路,因此对接收机Galileo信号时延校准是全球各守时实验室参与UTC链路的必要工作.以德国物理技术研究院(Physikalisch-Technische Bundesanstalt,PTB)和中国科学院国家授时中心(National Time Service Center,NTSC)已校准的GPS(GlobalPositioning System)链路为参考,将PT09接收机设为参考站,对NTSC的NT02和NT05两台不同型号接收机的GalileoE3(GalileoE1&E5a)总时延进行校准并验证.结果表明:NT02和NT05GalileoE3总时延分别为74.6ns和46.5ns,校准不确定度均为3.5ns,且校准时延比较稳定;NT02和NT05校准后与其他守时实验室已校准接收机的GPSP3和GalileoE3链路的共视比对结果基本一致;以NTP3与其他实验室接收机GPSP3链路的共视比对结果为参考,其偏差均值均小于1.5ns,在校准不确定度范围内.In order to improve the reliability of the time transfer link,Bureau International des Poids et Mesures(BIPM)has officially taken the Galileo time comparison as the backup link for UTC calculation since 2020.Therefore,the delay calibration of the Galileo signal of the receiver is a necessary work for all time-keeping labs around the world to participate in the UTC link.Taking the GPS link calibrated by Physikalisch-Technische Bundesanstalt(PTB)and the National Time Service Center(NTSC)as a reference,this paper sets PT09 receiver as a reference station to calibrate and verify the total Galileo E3(Galileo E1&E5a)delay of NT02 and NT05 receivers of NTSC.The results show that the total Galileo E3 delays of NT02 and NT05 are 74.6 ns and 46.5 ns respectively,the calibration uncertainty is 3.5 ns,and the calibration delay is relatively stable.After calibration,the results of GPS P3 and Galileo E3 common view comparison between NT02 and NT05 receivers of NTSC and calibrated receivers of other time-keeping labs are basically consistent.Taking the comparison results of GPS P3 links between NTP3 and receivers of other labs as a reference,the average deviation is less than 1.5 ns,which is within the calibration uncertainty.

关 键 词：GalileoE3 时延校准 校准不确定度 

分 类 号：P127[天文地球—天体测量]