Mon Oct 13, F. Flechtner
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Guo, Shiwei, Fan, Lei, Li, Zongnan, Fang, Xinqi, Huo, Chenshu, and Shi, Chuang, 2025. Determining geocenter motion using combined ground and spaceborne GPS observations with ambiguity resolution. Advances in Space Research, 75(11):7903–7916, doi:10.1016/j.asr.2025.03.038.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025AdSpR..75.7903G,
author = {{Guo}, Shiwei and {Fan}, Lei and {Li}, Zongnan and {Fang}, Xinqi and {Huo}, Chenshu and {Shi}, Chuang},
title = "{Determining geocenter motion using combined ground and spaceborne GPS observations with ambiguity resolution}",
journal = {Advances in Space Research},
keywords = {Geocenter motion, Ambiguity resolution, LEO, GPS, GRACE-FO, Sentinel-3},
year = 2025,
month = jun,
volume = {75},
number = {11},
pages = {7903-7916},
abstract = "{Owing to the dense global tracking network and the abundant satellites
providing continuous observations, the Global Navigation
Satellite System (GNSS) has the potential to measure geocenter
motion. However, the high altitude of GNSS satellites and the
estimation of phase ambiguities compromise the quality of the
estimated geocenter coordinates (GCC). This study conducted a
combined zero-difference processing of ground observations from
98 global stations and spaceborne observations from four low
Earth orbiters (LEOs), investigating the impact of integer
ambiguity resolution and LEO configuration on GPS-derived GCC
estimates. The ambiguity resolution in the double-difference
mode between ground stations and one LEO can significantly
improve the observability of GCC estimates, reducing the formal
errors by 69.4 \%, 69.4 \% and 55.0 \% for the X, Y and Z
components, respectively. The faster relative motion between LEO
and GPS satellites contributes to a faster change of tracking
geometry. Integrating four LEOs into ground network, the formal
errors of GCC parameters are reduced by 77.8 \%, 78.2 \% and
50.5 \% for the X, Y and Z components, respectively. For the
most concerned GCC Z component, its correlation with the
B$_{1C}$ empirical parameter is reduced from 0.69 to 0.41,
demonstrating that the GCC Z component is more separable from
the orbital parameters. Besides, the 5th and 7th draconitic
harmonics of the Z component are mitigated by 67.0 \% and 73.5
\%, respectively. The derived annual signal shows a good
consistency with the external SLR-based solution, and the
amplitude differences are only 0.9 mm, 1.6 mm and 1.2 mm for the
X, Y and Z components, respectively.}",
doi = {10.1016/j.asr.2025.03.038},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025AdSpR..75.7903G},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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