Proposal for a realtime Einstein-synchronization-defined satellite virtual clock

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-04-12 DOI:10.1088/1674-1056/ad3dc9

Chenhao Yan, Xueyi Tang, Shiguang Wang, Lijiaoyue Meng, Haiyuan Sun, Yibin He, Lijun Wang

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引用次数: 0

Abstract

The realization of high performance satellite onboard clock is vital for various PNT applications. For further improvement of the synchronization-based satellite time and frequency references, this paper proposes a geosynchronous (GEO) satellite virtual clock concept based on ground–satellite synchronization and presents a beacon transponder structure for its implementation (scheduled for launch in 2025), which does not require atomic clocks to be mounted on the satellite. Its high performance relies only on minor modifications to the existing transponder structure of GEO satellites. We carefully modeled the carrier phase link and analyzed the factors causing link asymmetry within the special relativity. Considering that the performance of such synchronization-based satellite clocks is primarily limited by the link’s random phase noise, which cannot be adequately modeled, we designed a closed-loop experiment based on commercial GEO satellites for pre-evaluation. This experiment was aimed at extracting the zero-means random part of the ground-satellite Ku-band carrier phase via a feedback loop. Ultimately, we obtained a 1σ value of 0.633 ps (two-way link), following the Gaussian distribution. From this result, we conclude that the proposed real-time Einstein-synchronization-defined satellite virtual clock can achieve picosecond-level replication of onboard time and frequency.

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关于爱因斯坦同步定义的实时卫星虚拟时钟的建议

实现高性能卫星星载时钟对各种 PNT 应用至关重要。为进一步改进基于同步的卫星时间和频率基准，本文提出了一种基于地面-卫星同步的地球同步（GEO）卫星虚拟时钟概念，并介绍了一种信标转发器结构，该结构无需在卫星上安装原子钟即可实现（计划于 2025 年发射）。它的高性能仅依赖于对地球同步轨道卫星现有转发器结构的微小改动。我们对载波相位链路进行了仔细建模，并在狭义相对论范围内分析了导致链路不对称的因素。考虑到这种基于同步的卫星时钟的性能主要受限于链路的随机相位噪声，而这种噪声是无法充分建模的，因此我们设计了一个基于商用地球同步轨道卫星的闭环实验来进行预评估。该实验旨在通过反馈回路提取地面-卫星 Ku 波段载波相位的零均值随机部分。最终，我们获得了 0.633 ps 的 1σ 值（双向链路），符合高斯分布。根据这一结果，我们得出结论，所提出的实时爱因斯坦同步定义的卫星虚拟时钟可以实现皮秒级的星载时间和频率复制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.