四频 PPP-B2b 时间传输研究

IF 1.6 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Instrumentation & Measurement Magazine Pub Date : 2024-02-01 DOI:10.1109/MIM.2024.10423730

Runzhi Zhang, Lan Li, Xueqing Li, Hongjiao Ma, Gongwei Xiao, Jihai Zhang

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引用次数: 0

摘要

载波相位时间转移是世界协调时（UTC）计算中的一项重要技术，通过精确点定位（PPP）来实现。自 2020 年 8 月起，北斗全球导航卫星系统（BDS-3）通过三颗地球静止轨道（GEO）卫星代替亚太地区的网络，为用户提供了精确的卫星产品，这是 PPP 实施过程中必不可少的外部输入，被命名为 PPP-B2b 产品。PPP-B2b 产品可被视为解决了传统 PPP 时间传输中因网络中断而造成的不稳定问题。目前，使用双频（DF）无电离层组合的 PPP-B2b 时间传送可达到亚纳秒级精度的事实已得到证实。考虑到 BDS-3 可以为用户提供多种频率信号用于 PPP；同时，多频 PPP 将提高时间传输的精度并加速收敛。这种改善可归因于多频率的利用导致观测方程数量的增加。为了促进 PPP-B2b 时间实时比较在 UTC 计算中的应用，提出并研究了四频（QF）PPP-B2b 时间转移模型。与 DF PPP-B2b 时间传送相比，QF 时间传送模型的准确性通过长基线时间链路和零基线公共时钟差（CCD）得到了验证。结果表明，与 DF PPP-B2b 模型相比，QF PPP-B2b 时间传输的 CCD 结果更平滑，波动在 0.1 ns 以内。以使用 GBM 产品的 PPP 时间比较为参考，所有长基线链路的结果显示，QF PPP-B2b 时间比较的残差确实在 1 ns 内波动。

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Research on Quad-Frequency PPP-B2b Time Transfer

Carrier phase time transfer which is a crucial technique in universal time coordinated (UTC) calculation is implemented through precise point positioning (PPP). Since August 2020, the Beidou global navigation satellite system (BDS-3) has provided users with the precise satellite product which is an essential external input in the PPP implementation, named the PPP-B2b product, through three geostationary earth orbit (GEO) satellites instead of a network in the Asia-Pacific area. The PPP-B2b product can be considered to solve the instability problem caused by network interruption in traditional PPP time transfer. Currently, the fact that the PPP-B2b time transfer using dual-frequency (DF) ionosphere-free combination can achieve sub-nanosecond accuracy has been proven. Considering the BDS-3 can provide users with a wide range of frequency signals for PPP; meanwhile, the multi-frequency PPP will improve the accuracy of time transfer and accelerate the convergence. This improvement can be attributed to an increase in the number of observation equations due to the utilization of multiple frequencies. To promote the application of real-time PPP-B2b time comparison in UTC calculation, a quad-frequency (QF) PPP-B2b time transfer model is proposed and investigated. Compared to DF PPP-B2b time transfer, the accuracy of the QF time transfer model was verified from long-baseline time links and zero-baseline common clock difference (CCD). Results showed that the QF PPP-B2b time transfer had smoother CCD results and fluctuated within 0.1 ns, compared to the DF PPP-B2b model. Taking the PPP time comparison using the GBM product as a reference, the results for all long-baseline links show that the residuals of the QF PPP-B2b time comparison truly fluctuate within 1 ns.

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来源期刊

IEEE Instrumentation & Measurement Magazine 工程技术-工程：电子与电气

CiteScore

4.20

自引率

4.80%

发文量

147

审稿时长

>12 weeks

期刊介绍： IEEE Instrumentation & Measurement Magazine is a bimonthly publication. It publishes in February, April, June, August, October, and December of each year. The magazine covers a wide variety of topics in instrumentation, measurement, and systems that measure or instrument equipment or other systems. The magazine has the goal of providing readable introductions and overviews of technology in instrumentation and measurement to a wide engineering audience. It does this through articles, tutorials, columns, and departments. Its goal is to cross disciplines to encourage further research and development in instrumentation and measurement.