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

verfasst von
Qinglu Mu, Jürgen Müller, Hu Wu, Annike Knabe, Min Zhong
Abstract

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.

Organisationseinheit(en)
Institut für Erdmessung
QuantumFrontiers
SFB 1464: Relativistische und quanten-basierte Geodäsie (TerraQ)
Externe Organisation(en)
Graduate University of Chinese Academy of Sciences
Sun Yat-Sen University
Typ
Artikel
Journal
Advances in space research
ISSN
0273-1177
Publikationsdatum
19.08.2023
Publikationsstatus
Elektronisch veröffentlicht (E-Pub)
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Luft- und Raumfahrttechnik, Astronomie und Astrophysik, Geophysik, Atmosphärenwissenschaften, Astronomie und Planetologie, Erdkunde und Planetologie (insg.)
Elektronische Version(en)
https://doi.org/10.1016/j.asr.2023.08.023 (Zugang: Geschlossen)
 

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