Modeling and performance analysis of real⁃time BDS⁃3 PPP⁃B2b one⁃way timing with uncombined observations  

基于非组合观测值的实时北斗三PPP-B2b单向授时模型建立与分析

作　　者：WANG Yong LIU Tianjun GU Shengfeng GE Yulong JIANG Weiping 王勇;刘天骏;辜声峰;葛玉龙;姜卫平(武汉大学卫星导航定位技术研究中心,武汉430079;湖北珞珈实验室,武汉430079;江苏省测绘工程院,南京210013;南京师范大学海洋科学与工程学院,南京210023)

机构地区：[1]GNSS Research Center,Wuhan University,Wuhan 430079,China [2]Hubei Luojia Laboratory,Wuhan 430079,China [3]Jiangsu Province Surveying and Mapping Engineering Institute,Nanjing 210013,China [4]School of Marine Science and Engineering,Nanjing Normal University,Nanjing 210023,China

出　　处：《Journal of Southeast University(English Edition)》2025年第1期67-77,共11页东南大学学报(英文版)

基　　金：The Basic Science Center Project of the National Natural Science Foundation of China(No.42388102);the Jiangsu Province Natural Resources Science and Technology Project(No.JSZRKJ202404).

摘　　要：Currently,the BeiDou⁃3(BDS⁃3)precise point positioning(PPP)service(PPP⁃B2b)mostly employs the ionosphere⁃free(IF)combination model for precise timing,which tends to amplify the noise in observation values.To address this issue,this paper proposes a real⁃time BDS⁃3 precise unidirectional timing model based on uncombined(UC)observations using the BDS⁃3 PPP⁃B2b service.This model resolves the challenge of the amplified observation noise inherent in the IF combination model.The experiment involved selecting eight global navigation satellite system(GNSS)observation stations within China and collecting continuous observation data for 15 d.A comparative analy⁃sis with the traditional dual⁃frequency IF combination PPP timing model showed that the BDS⁃3 UC PPP timing based on the BDS⁃3 PPP⁃B2b service can achieve a timing preci⁃sion of 0.5 ns.In addition,it was found that due to global positioning system(GPS)satellite clock products in the BDS⁃3 PPP⁃B2b service not being unified to the standard time,the GPS IF PPP timing method based on the BDS⁃3 PPP⁃B2b service is not recommended for precise timing.In summary,the BDS⁃3 UC PPP timing model proposed in this paper is suitable for precise timing,providing observa⁃tion values with smaller noise,and its timing accuracy is comparable to that of the BDS⁃3 IF PPP,with slightly better frequency stability.目前北斗三号(BDS-3)精密单点定位服务大多采用无电离层(IF)组合模型进行精密授时,易放大观测值噪声。为此,本文基于非组合观测值的实时北斗三PPP-B2b服务,建立了一种基于非组合(UC)观测值的实时BDS-3精密单向授时模型,解决了IF组合模型存在的观测值噪声被放大的难题。试验选取了8个中国境内的GNSS观测站,并采集了连续15 d的观测数据。与传统的双频无电离层组合PPP授时模型进行对比分析,结果表明,基于BDS-3 PPP-B2b服务的BDS-3 UC PPP授时可实现0.5 ns的授时精度。此外,由于BDS-3 PPP-B2b服务中GPS卫星钟产品的基准未统一至标准时间,基于BDS-3 PPP-B2b服务的GPS IF PPP授时方法不建议用于精密授时。总之,本文提出的BDS-3 UC PPP授时模型适用于精密授时,可提供更小噪声的观测值,其授时精度与BDS-3 IF PPP相当,且其频率稳定度稍优于BDS-3 IF PPP。

关 键 词：precise point positioning service precise tim⁃ing BDS⁃3 uncombined precise point positioning 

分 类 号：P228.9[天文地球—大地测量学与测量工程]