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May 14, 2026Geophysical Journal InternationalOpen Access

Joint GRACE-FO Orbit and Gravity Field Determination Using GPS Ambiguity-resolved Carrier-phase and KBR Observations

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Authors

GGGeng GaoWZWei ZhengKKKaifa Kuang

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Overview

Randomized trial evaluates gravity field and orbit methods in GRACE-FO, indicating implications for satellite gravimetry.

Key Points

  • This study aims to evaluate the impact of integer ambiguity resolution on satellite orbit and gravity field recovery for GRACE-FO data.
  • Developed a dynamic framework for jointly estimating satellite orbits and gravity fields using GPS and KBR observations.
  • Used onboard data from GRACE-FO between July and December 2019.
  • Compared solutions with fixed and float integer ambiguities regarding orbit accuracy and gravity field quality.
  • Achieved 1.2 cm RMS orbit precision improvement with integer ambiguity resolution.
  • Float ambiguity solutions align closely with official SDS RL06.1 models up to degree 96; IAR solutions valid only to degree 40.
  • Observed irregular oscillations in IAR solutions beyond degree 40 correlated with intensified north-south striping in water height maps.

Cite This Study

Gao et al. (2026) studied this question.

synapsesocial.com/papers/6a0565f4a550a87e60a1e23dhttps://doi.org/10.1093/gji/ggag098
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