Mon Oct 13, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Li, Haosi, Xu, Peng, Tang, He, and Yi, Shuang, 2025. Revisiting GRACE Follow-On KBR Antenna Phase Center Calibration by Addressing Multipath Noise. Remote Sensing, 17(3):353, doi:10.3390/rs17030353.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025RemS...17..353L,
author = {{Li}, Haosi and {Xu}, Peng and {Tang}, He and {Yi}, Shuang},
title = "{Revisiting GRACE Follow-On KBR Antenna Phase Center Calibration by Addressing Multipath Noise}",
journal = {Remote Sensing},
keywords = {GRACE Follow-On, antenna offset correction, K-band ranging, multipath noise},
year = 2025,
month = jan,
volume = {17},
number = {3},
eid = {353},
pages = {353},
abstract = "{The Gravity Recovery and Climate Experiment Follow-On (GRFO) mission
precisely measures the inter-satellite range between the centers
of mass of its twin satellites to map the earth's gravity field.
The baseline ranging measurement is achieved using the K-band
ranging (KBR) system, which is sensitive to satellite attitude
variations caused by the offset between the satellite center of
mass and the KBR antenna phase center. Accurate decoupling of
the KBR range from attitude variations requires precise
determination of the KBR's antenna offset vectors (AOVs). To
address this, GRFO conducted eight KBR calibration maneuvers on
17 and 28 September 2020. However, these maneuvers exaggerated
the impact of microwave multipath noise, complicating AOV
estimation. Existing studies have not fully mitigated this
noise. This study introduces a new frequency-domain method to
estimate AOVs by leveraging double-difference signals and
analyzing their spectral characteristics, along with those of
the KBR range during calibration maneuvers, to suppress
multipath noise. Our recalibrated AOVs achieve good alignment
between the KBR and laser ranging interferometer (LRI) ranging
signals. We validate our recalibrated AOVs by comparing the
residuals between the LRI and KBR ranging signals corrected
using both recalibrated AOVs and documented AOVs. The results
show that, for the majority (58.4\%) of the analyzed period
(from January 2020 to June 2023), the residuals corrected by the
recalibrated AOVs are closer to the LRI ranging signal. These
findings demonstrate the effectiveness of the proposed method in
addressing multipath noise and improving the accuracy of KBR
range measurements. This work provides a framework for future
gravity missions requiring precise calibration of multipath
effects in inter-satellite ranging systems.}",
doi = {10.3390/rs17030353},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025RemS...17..353L},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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Mon Oct 13, F. Flechtner