大地测量与地球动力学2026，Vol.46Issue(6)：685-694,10.DOI:10.14075/j.jgg.2025.09.315
伽利略偏心轨道卫星星载原子钟在轨性能评估分析
On-Orbit Performance Assessment of Onboard Atomic Clocks for Galileo Eccentric-Orbit Satellites
摘要
Abstract
In this study,1 216 consecutive days of ESA precise clock products(January 2022 to April 2025)were analyzed by combining clock-fit parameters,frequency-stability metrics,and spectral analysis to assess the long-term behavior of the onboard clocks.Results show that E14 experienced three phase jumps and two frequency jumps during this period,more frequently than nominal circular-orbit satellites.Following the frequency jump in April 2024,its frequency drift and fitting ac-curacy deteriorated markedly:residual peaks exceeded 10 ns,and an anomalous periodicity of about 0.63 h emerged with increasing amplitude and no evident secondary component.The frequency stabili-ty simultaneously worsened,showing oscillatory behavior near 100 s.After another frequency jump in March 2025,both residuals and stability improved,with stability reaching 2.50× 10-13,6.52×10-14,and 9.70 × 10-14 at 100 s,1 000 s,and 10 000 s,respectively.No dominant periodic term was ob-served afterward,but the drift exhibited a systematic bias,and a"dip"feature appeared near 4 000 s.In contrast,the co-orbital E18 satellite maintained stable performance throughout the same period,with fitting residuals confined within±0.2 ns,no significant high-frequency periodic components,and frequency stability comparable to that of nominal MEO satellites,showing no anomalous behav-ior.关键词
Galileo/偏心轨道/E14/E18/钟差多项式拟合/频谱分析Key words
Galileo/eccentric-orbit/E14/E18/clock offset polynomial fitting/spectrum analysis分类
天文与地球科学引用本文复制引用
白云龙,王乐,黄观文,解世超,谢威,曹钰,范丽红..伽利略偏心轨道卫星星载原子钟在轨性能评估分析[J].大地测量与地球动力学,2026,46(6):685-694,10.基金项目
国家自然科学基金(42374025) （42374025）
长安大学中央高校基本科研业务费专项(300102265503,300102261301). （300102265503,300102261301）
