非等间隔测量条件下的时间传递链路数据融合方法研究  

Research on Data Fusion Method of Time Transfer Link under Unequal-interval Measurement Conditions

作　　者：王翔[1,2] 宋会杰[1,2] 郭栋[1,2] 高喆 王威雄[1,2] 武文俊[1,2,3] 董绍武 WANG Xiang;SONG Hui-jie;GUO Dong;GAO Zhe;WANG Wei-xiong;WU Wen-jun;DONG Shao-wu(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600;Key Laboratory of Time Reference and Applications,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]中国科学院时间基准及应用重点实验室,西安710600 [3]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》2025年第2期1-11,共11页Acta Astronomica Sinica

基　　金：中国科学院“西部之光”人才培养计划(XAB2021YN22);北京无线电计量测试研究所开放基金项目(JLJK2021001-A002)资助。

摘　　要：为了充分利用不同类型的时间传递链路,需要实现不同采样率下时间传递链路数据的融合应用,提出了一种基于多分辨率分析的数据融合方法.首先对原始数据进行小波分解,把数据分解到统一的分辨率,初步消除高频噪声;然后在不同分辨率下进行Kalman滤波;最后通过Mallat快速重构算法得到融合结果.使用该方法处理中国科学院国家授时中心(National Time Service Center,NTSC)和德国联邦物理技术研究所(PhysikalischTechnische Bundesanstalt,PTB)之间的时间传递数据,结果显示融合算法能够处理链路异常或中断造成的数据问题.由于GPS(Global Positioning System)PPP(Precise Point Positioning solutions)链路实测结果性能整体优于TWSTFT(Two-Way Satellite Time and Frequency Transfer)链路,因此用GPS PPP链路测量结果评估融合算法增益.以快速协调世界时(Rapid Realization of Coordinated Universal Time,UTCr)为参考,数据融合结果的准确性增益约1%,日频率稳定度增益优于20%.同时融合算法可以抑制TWSTFT链路的周期噪声,能够有效提高链路的稳定性和鲁棒性.In order to fully utilize different types of time transfer links,it is necessary to realize the fusion application of time transfer link data under different sampling rates.This article proposes a data fusion method based on multi-resolution analysis.Firstly,we perform wavelet decomposition on the original data to achieve a unified resolution and initially eliminate high-frequency noise.Subsequently,Kalman filtering is employed across various resolutions.Ultimately,the Mallat fast reconstruction algorithm is utilized to derive the fusion result.The method is used to process time transfer data between the National Time Service Center(NTSC)of the Chinese Academy of Sciences and the Physikalisch-Technische Bundesanstalt(PTB)of Germany.The results show that the fusion algorithm can handle data problems caused by link anomalies or interruptions.Since the actual measurement results of the GPS(Global Positioning System)PPP(Precise Point Positioning solutions)link perform better than those of the TWSTFT(Two-Way Satellite Time and Frequency Transfer)link overall,the GPS PPP link measurement results are used to evaluate the gain of the fusion algorithm.Using Rapid Realization of Coordinated Universal Time(UTCr)as the reference,the accuracy gain of the data fusion result is about 1%,and the daily frequency stability gain is better than 20%.At the same time,the fusion algorithm can suppress the periodic noise of the TWSTFT link,effectively improving the stability and robustness of the link.

关 键 词：技术:TWSTFT 技术:GPS PPP 技术:时间传递 方法:小波分解 方法:卡尔曼滤波 方法:融合 

分 类 号：P127[天文地球—天体测量]