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Conference Paper

Temporal gravity field solutions from SmallSat Constellation GNSS data

Authors

Smith,  Patrick
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Shum,  C.K.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zhang,  Yu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zhang,  Chaoyang
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bezděk,  Aleš
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

de Teixeira Da Encarnação,  João
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Yao,  Jian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Weiss,  Jan-Peter
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Talpe,  Matthieu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Nguyen,  Vu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jales,  Philip
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Smith, P., Shum, C., Zhang, Y., Zhang, C., Bezděk, A., de Teixeira Da Encarnação, J., Yao, J., Weiss, J.-P., Talpe, M., Nguyen, V., Jales, P. (2023): Temporal gravity field solutions from SmallSat Constellation GNSS data, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4848


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021252
Abstract
The time-variable Earth’s gravity field is related to the mass transport and the physical processes within Earth’s system (including the atmosphere, oceans, hydrosphere, and cryosphere), such as melting of ice sheets and glaciers, ocean circulation and sea level variations, hydrological cycle, glacial isostatic adjustment, and earthquake-induced gravity change. The application of precise orbit determination (POD) provides valuable information about the Earth’s mass transport manifested in the temporal variations of the gravity field. This project uses the kinematics orbit-based acceleration approach, which has proven to be effective on the operational temporal gravity field data product generation using the high-low GNSS tracking data collected by the 3-satellite Swarm constellation. This project will utilize geodetic quality, dual-frequency high-low (GNSS-Spire CubeSats) tracking data from Spire Global, Inc.’s ~40 Lemur-2 3U CubeSat constellation. This low Earth orbiting (LEO) constellation is primarily dedicated to operational atmosphere data retrieval using radio occultation, bistatic GNSS-reflectometry forward scattering signals and grazing angle altimetry. The acceleration approach can provide solutions of the Earth’s temporal gravity field in long-wavelength (longer than 1,000 km), but plausibly at higher temporal sampling, weekly or finer with the global coverage of up to 40 simultaneous GNSS-Sensing of Spire CubeSats. This provides an additional observing architecture of gravity field solutions which can be used in conjunction with the more accurate and higher resolution temporal gravity solutions from GRACE-FO to further improve the temporal resolutions of monitoring abrupt-episode natural hazard evolution such as tropical cyclones, wildfires and floods, as well as weekly surface/ground water storage changes.