TY - JOUR

T1 - Satellite gradiometry based on a new generation of accelerometers and its potential contribution to Earth gravity field determination

AU - Mu, Qinglu

AU - Müller, Jürgen

AU - Wu, Hu

AU - Knabe, Annike

AU - Zhong, Min

N1 - Funding information: We acknowledge the support by the Deutsche Forschungsgemeinschaft (DFG, Germany Research Foundation) – Project-ID 434617780 – SFB 1464 and under Germany's Excellence Strategy–EXC 2123 Quantum-Frontiers-390837967 and the support by Deutsches Zentrum fur Luft- und Raumfahrt e.V. (DLR) for the project Q-BAGS. This work was also supported by the National Natural Science Foundation of China (12261131504 and 2022YFC22001001). Qinglu Mu also would like to thank the China Scholarship Council for funding his research work in Germany. The results presented here were partially carried out on the cluster system at the Leibniz University of Hannover, Germany. We acknowledge the support by the Deutsche Forschungsgemeinschaft (DFG, Germany Research Foundation) – Project-ID 434617780 – SFB 1464 and under Germany's Excellence Strategy–EXC 2123 Quantum-Frontiers-390837967 and the support by Deutsches Zentrum fur Luft- und Raumfahrt e.V. (DLR) for the project Q-BAGS. This work was also supported by the National Natural Science Foundation of China ( 12261131504 and 2022YFC22001001 ). Qinglu Mu also would like to thank the China Scholarship Council for funding his research work in Germany. The results presented here were partially carried out on the cluster system at the Leibniz University of Hannover, Germany.

PY - 2024/3/15

Y1 - 2024/3/15

N2 - An accurate model of the Earth's gravity field is beneficial for practical engineering and many applications in geosciences. European Space Agency (ESA) realized the Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) gradiometry mission between 2009 and 2013. However, the low-frequency drift of the onboard electrostatic accelerometers (EA) limits the observation accuracy of the GOCE mission to some extent. Advances in electrostatic and quantum technology offer new measurement concepts for future gradiometry missions. In this study, we evaluate the contributions of several types of accelerometers through numerical closed-loop simulation which rigorously maps the accelerometers’ sensitivities to the gravity field coefficients. In comparison to the simulated results of the GRADIO gradiometer used in GOCE, it is demonstrated that the MicroSTAR-type gradiometer has superior precision within degree and order 100 and provides more signal information in the off-diagonal components of the gravity gradient tensor (GGT). The precision of the gravity field model recovery from a HybridACC-type gradiometer is significantly affected by the noise level of the cold atom interferometry (CAI) accelerometer. A HybridACC-type gradiometer with low CAI performance (1×10-9m·s-2/Hz) only favors the high degree component because of its higher accuracy in the measurement bandwidth (MBW) between 5 mHz and 100 mHz. While a better CAI performance up to 1×10-11m·s-2/Hz will increase retrieval performance remarkably. With an orbital rotation compensation mechanism, the CAI gradiometer performs with greater accuracy overall. Otherwise, the accuracy based on this sort of gradiometer is only superior up to degree 50.

AB - An accurate model of the Earth's gravity field is beneficial for practical engineering and many applications in geosciences. European Space Agency (ESA) realized the Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) gradiometry mission between 2009 and 2013. However, the low-frequency drift of the onboard electrostatic accelerometers (EA) limits the observation accuracy of the GOCE mission to some extent. Advances in electrostatic and quantum technology offer new measurement concepts for future gradiometry missions. In this study, we evaluate the contributions of several types of accelerometers through numerical closed-loop simulation which rigorously maps the accelerometers’ sensitivities to the gravity field coefficients. In comparison to the simulated results of the GRADIO gradiometer used in GOCE, it is demonstrated that the MicroSTAR-type gradiometer has superior precision within degree and order 100 and provides more signal information in the off-diagonal components of the gravity gradient tensor (GGT). The precision of the gravity field model recovery from a HybridACC-type gradiometer is significantly affected by the noise level of the cold atom interferometry (CAI) accelerometer. A HybridACC-type gradiometer with low CAI performance (1×10-9m·s-2/Hz) only favors the high degree component because of its higher accuracy in the measurement bandwidth (MBW) between 5 mHz and 100 mHz. While a better CAI performance up to 1×10-11m·s-2/Hz will increase retrieval performance remarkably. With an orbital rotation compensation mechanism, the CAI gradiometer performs with greater accuracy overall. Otherwise, the accuracy based on this sort of gradiometer is only superior up to degree 50.

KW - Accelerometry

KW - Cold atom interferometry

KW - Gravity field

KW - Next generation gravity mission

KW - Numerical simulations

KW - Space gravity gradiometry

UR - http://www.scopus.com/inward/record.url?scp=85171350995&partnerID=8YFLogxK

U2 - 10.1016/j.asr.2023.08.023

DO - 10.1016/j.asr.2023.08.023

M3 - Article

AN - SCOPUS:85171350995

VL - 73

SP - 3321

EP - 3344

JO - Advances in space research

JF - Advances in space research

SN - 0273-1177

IS - 6

ER -