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GRACE-FO accelerometer performance analysis and calibration

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Abstract

As a crucial payload on dedicated gravity satellites, the accelerometer (ACC) measures the non-gravitational force acting on the satellite. The unknown scale and bias contaminate the raw ACC data, preventing the direct use in precise orbit determination (POD) and gravity recovery, and thus ACC data need to be calibrated. We analyze the performance of GRACE-FO ACC and calibrate the ACC data from 2018 to 2021 based on a step-by-step calibration method. First, we give an overview of temperature records and ACC operational modes, which reflect the operational status of the ACC. The calibration method consists of four steps: pre-calibration, two POD processes with different parameterizations, and bias fitting. Low-degree/order (10 × 10) spherical harmonic coefficients (SHCs) are estimated with scale, bias, and other dynamic parameters in POD. As an assessment, we compare the calibrated ACC data and the modeled non-gravitational force products. The average differences between them are less than 5 nm/s2 in the SRF-X direction and 6 nm/s2 in other directions. The obtained orbits based on ACC data and GPS observations are compared with precise science orbits. Furthermore, six tests show that introducing low-order/degree SHCs could effectively improve the consistency of the calibrated ACC data with non-gravitational force models and enhance orbit determination. Otherwise, empirical accelerations should be estimated with loose constraints to ensure POD results.

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Data availability

All original data in this study are publicly available. GPS ephemeris, precise clock offset are available from the CODE (ftp.aiub.unibe.ch), and the GRACE-FO L1B dataset from JPL at https://podaac.jpl.nasa.gov/GRACE-FO or GFZ via ftp://rz-vm152.gfz-potsdam.de/. The Jacchia-Bowman 2008 empirical thermospheric density model can be found at https://sol.spacenvironment.net/jb2008/introduction.html. CERES earth radiation data were obtained from https://ceres.larc.nasa.gov/. Non-gravitational force products were provided by the Institute of Geodesy (IfG) at Graz University of Technology via https://ftp.tugraz.at/outgoing/ITSG/satelliteOrbitProducts/.

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Acknowledgements

This study is sponsored by the National Natural Science Foundation of China (Grant No. 41974013, 42174014). We thank the two anonymous reviewers for their comments, which greatly improved our original manuscript.

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Contributions

JZ, WY, and BY devised the main conceptual ideas; JZ performed the calculations for the experiments; BY and DF helped to analyze the results and data; JZ and BY prepared figures; JZ and WY wrote the manuscript; WY, BY, and DF modified the manuscript; all authors discussed the results and contributed to the final manuscript.

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Correspondence to Wei You.

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The authors declare no competing interests.

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Zhang, J., You, W., Yu, B. et al. GRACE-FO accelerometer performance analysis and calibration. GPS Solut 27, 158 (2023). https://doi.org/10.1007/s10291-023-01487-5

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  • DOI: https://doi.org/10.1007/s10291-023-01487-5

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