Mon Dec 15, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Zhao, Minxing, Zou, Xiancai, Pan, Juanxia, Zhong, Luping, Liu, Han, and Li, Jiancheng, 2025. One-step estimation of earth gravity field from GRACE and ground-based GPS measurements combination. Advances in Space Research, 76(8):4349–4361, doi:10.1016/j.asr.2025.07.063.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025AdSpR..76.4349Z,
author = {{Zhao}, Minxing and {Zou}, Xiancai and {Pan}, Juanxia and {Zhong}, Luping and {Liu}, Han and {Li}, Jiancheng},
title = "{One-step estimation of earth gravity field from GRACE and ground-based GPS measurements combination}",
journal = {Advances in Space Research},
keywords = {One-step method, Integrated Adjustment, Earth gravity field, GRACE, GPS},
year = 2025,
month = oct,
volume = {76},
number = {8},
pages = {4349-4361},
abstract = "{The combination of satellite gravimetry measurements with other
techniques can promote the integration of the ``Three Pillars''
of geodesy, namely, the Earth's shape, gravity field, and
rotation. Combined processing of Gravity Recovery and Climate
Experiment (GRACE) gravimetry and ground-based Global
Positioning System (GPS) measurements at the observation level
can theoretically improve parameter accuracy. However, because
of the implementation challenges, existing combination
experiments are limited to low-degree (up to degree and order
20) gravity field determination or daily and weekly solutions.
Here we present a one-step method for determining higher monthly
gravity field solutions and the resulting models are up to
degree and order 60. A comprehensive analysis of theoretical
models and experimental results demonstrates the advantages of
the one-step approach over the conventional two-step method,
which processes ground and GRACE observations separately.
Compared to two-step results, the one-step approach yields
improvements in low-degree gravity field coefficients, with a 60
\% improvement in the signal of the C$_{20}$ coefficient. The
polar motion x-component shows an average improvement of 58 \%,
while GPS satellite orbits achieved approximately 35 \%
reduction of Satellite Laser Ranging (SLR) residuals RMS. The
GRACE satellite orbit exhibits a 22 \% reduction in SLR
residuals RMS for GRACE-A and 17 \% for GRACE-B. In summary, the
one-step method produces more consistent gravity and geometric
products, improving the accuracy of shared parameters between
ground-based and GRACE observations.}",
doi = {10.1016/j.asr.2025.07.063},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025AdSpR..76.4349Z},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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Mon Dec 15, F. Flechtner