Mon Dec 15, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Liu, Guanqi, Ye, Fei, Chen, Xin, Chen, Qianqian, Lyu, Daqian, Jiao, Guoqiang, Ge, Yulong, Zhou, Peiyuan, Cao, Xinyun, Shen, Fei, and Shu, Qiang, 2025. Real-time Galileo/GPS PPP timing for LEO satellite via Galileo HAS. Measurement Science and Technology, 36(8):086317, doi:10.1088/1361-6501/adfb9a.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025MeScT..36h6317L,
author = {{Liu}, Guanqi and {Ye}, Fei and {Chen}, Xin and {Chen}, Qianqian and {Lyu}, Daqian and {Jiao}, Guoqiang and {Ge}, Yulong and {Zhou}, Peiyuan and {Cao}, Xinyun and {Shen}, Fei and {Shu}, Qiang},
title = "{Real-time Galileo/GPS PPP timing for LEO satellite via Galileo HAS}",
journal = {Measurement Science and Technology},
keywords = {HAS, LEO, precise timing, time transfer, frequency stability},
year = 2025,
month = aug,
volume = {36},
number = {8},
eid = {086317},
pages = {086317},
abstract = "{Ensuring high-precision time synchronization among low Earth orbit (LEO)
satellites, as well as between LEO and global navigation
satellite system (GNSS) satellites, is essential for enabling
high-precision applications. As an integrated precise point
positioning (PPP) augmentation service within the Galileo
satellite navigation system, Galileo High Accuracy Service (HAS)
offers free satellite ephemeris corrections for GPS and Galileo
satellites to global users, effectively supporting real-time
space-based autonomous GNSS PPP timing and time transfer for LEO
satellites. To explore the performance of HAS in LEO satellite
timing and time transfer, this study conducts an in-depth
analysis of GRACE-FO and Sentinel-6A for experiments. The
results indicated that during the study period, the short-term
stability (1280 s) of GPS PPP timing for the GRACE-FO using HAS
products was 3.64{\textendash}5.55 {\texttimes} 10$^{‑13}$,
whereas the long-term stability (10240 s) was
3.19{\textendash}5.93 {\texttimes} 10$^{‑14}$. The short-term
stability values of GPS, Galileo, and GPS-Galileo PPP timing for
Sentinel-6 A using HAS products were 1.75{\textendash}2.72
{\texttimes} 10$^{‑12}$, 6.97 {\texttimes}
10$^{‑13}${\textendash}1.04 {\texttimes} 10$^{‑12}$, and
6.79{\textendash}8.46 {\texttimes} 10$^{‑13}$, respectively. The
long-term stability values were 3.50{\textendash}5.05
{\texttimes} 10$^{‑13}$, 3.75{\textendash}5.04 {\texttimes}
10$^{‑13}$, and 3.44{\textendash}4.65 {\texttimes} 10$^{‑13}$,
respectively. Compared to reliable analysis centers, HAS showed
comparable performance in Galileo and Galileo/GPS PPP timing;
however, the short-term stability of GPS PPP timing was lower
due to the inferior quality of its GPS products. Regarding the
time transfer, HAS exhibited a short-term stability of
4.04{\textendash}5.09 {\texttimes} 10$^{‑13}$ (between GRACE-FO)
and 1.94{\textendash}2.30 {\texttimes} 10$^{‑12}$ (between
GRACE-FO C and Sentinel-6A), a long-term stability of
3.69{\textendash}5.14 {\texttimes} 10$^{‑14}$ (between GRACE-FO)
and 3.81{\textendash}5.29 {\texttimes} 10$^{‑13}$ (between
GRACE-FO C and Sentinel-6A) in GPS, which is inferior to
currently reliable analysis centers. Compared to the
International GNSS Service final product, HAS exhibited an
average standard deviation of 0.49 ns and 2.59 ns for GPS PPP
time transfer between GRACE-FO satellites and between GRACE-FO C
and Sentinel-6A, respectively.}",
doi = {10.1088/1361-6501/adfb9a},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025MeScT..36h6317L},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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Mon Dec 15, F. Flechtner