摘要
随着GNSS的不断发展,基于精密单点定位(precise point positioning,PPP)技术的高精度时间传递研究已成为时频领域的关键技术之一.本文以北斗三号系统解算接收机钟差为研究对象,分析了无电离层(ionospheric-free,IF)组合和非组合(uncombined,UC)PPP模型对时间传递的影响.首先推导了两种PPP数学模型差异,选取2024年年积日第79~81天的BRUX和USN7两个外接氢原子钟测站观测数据进行分析.结果表明:两种PPP模型解算的接收机钟差差值在0.15 ns内波动,修正的Allan方差数值接近;对BRUX-USN7时间链路对比分析,3天内时间传递结果均在0.8 ns内波动,两种模型解算钟差修正的Allan方差数值近似.综上,两种PPP模型虽然钟差数值解算的理论模型不同,但在钟差解算和时间传递方面无明显差异,非组合模型可以用来进行时间传递且在保留电离层信息方面更具有优势.
With the continuous development of GNSS,the research on high-precision time transfer based on precise point positioning(PPP)technology has become one of the key technologies in the field of time and frequency.In this paper,the receiver clock offset of the BeiDou-3 system is taken as the research object,and the influence of ionospheric-free and uncombined PPP models on time transfer is analyzed.Firstly,the differences between the two PPP mathematical models are derived,and the observation data of two external hydrogen atomic clocking stations BRUX and USN7 of day of year 79~81 in 2024 are selected for analysis.The results show that the receiver clock difference calculated by the two PPP models fluctuates within 0.15 ns,and the corrected Allan variance value is similar.For the BRUX and USN7 time link analysis,the time transfer results fluctuate within 0.8 ns within three days,the Allan variance values of the two models for solving the clock offset correction are approximate.In summary,although the two PPP models have different theoretical models for the numerical solution of the clock offset,there is no significant difference between the two models in terms of the clock offset solution and time transfer,the uncombined model can be used for time transfer and has more advantages in retaining ionospheric information.
作者
卞逸驰
王生亮
肖恭伟
岳利民
王宁波
杨一博
BIAN Yichi;WANG Shengliang;XIAO Gongwei;YUE Limin;WANG Ningbo;YANG Yibo(School of Communications and Information Engineering(School of Artificial Intelligence),Xi’an University of Posts and Telecommunications,Xi’an 710121,China;School of Vehicle and Transportation Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Xi’an Research Institute of Surveying and Mapping,Xi’an 710054,China;Shen County Shengkai Storage Co.,Ltd.,Liaocheng 252429,China;Aerospace Information Research institute,Chinese Academy of Sciences,Beijing 100094,China)
出处
《全球定位系统》
2025年第3期31-37,共7页
Gnss World of China
基金
国家重点研发计划(2023YFC2206100)
中国国家铁路集团有限公司科技研究开发计划(L2022X004)
山西省高等学校科技创新计划(2024L225)
山西省基础研究计划(自由探索类)青年项目(202203021212284)。
