Earth gravity field recovery using GPS, GLONASS, and SLR satellites

Sosnica, Krzysztof Jakub; Jäggi, Adrian; Thaller, Daniela; Meyer, Ulrich; Baumann, Christian; Dach, Rolf; Beutler, Gerhard (2014). Earth gravity field recovery using GPS, GLONASS, and SLR satellites. In: Proceedings of the 18th International Workshop on Laser Ranging. Fujiyoshida, Japan. 11.-15.11.2013.

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The time variable Earth’s gravity field provides the information about mass transport within the system Earth, i.e., the relationship of mass transport between atmosphere, oceans, and land hydrology. We recover the low-degree parameters of the time variable gravity field using microwave observations from GPS and GLONASS satellites and from SLR data to five geodetic satellites, namely LAGEOS-1/2, Starlette, Stella, and AJISAI. GPS satellites are particularly sensitive to specific coefficients of the Earth's gravity field, because of the deep 2:1 orbital resonance with Earth rotation (two revolutions of the GPS satellites per sidereal day). The resonant coefficients cause, among other, a “secular” drift (actually periodic variations of very long periods) of the semi-major axes of up to 5.3 m/day of GPS satellites. We processed 10 years of GPS and GLONASS data using the standard orbit models from the Center of Orbit Determination in Europe (CODE) with a simultaneous estimation of the Earth gravity field coefficients and other parameters, e.g., satellite orbit parameters, station coordinates, Earth rotation parameters, troposphere delays, etc. The weekly GNSS gravity solutions up to degree and order 4/4 are compared to the weekly SLR gravity field solutions. The SLR-derived geopotential coefficients are compared to monthly GRACE and CHAMP results.

Item Type:

Conference or Workshop Item (Paper)

Division/Institute:

08 Faculty of Science > Institute of Astronomy

UniBE Contributor:

Sosnica, Krzysztof Jakub; Jäggi, Adrian; Thaller, Daniela; Meyer, Ulrich; Baumann, Christian; Dach, Rolf and Beutler, Gerhard

Subjects:

500 Science > 520 Astronomy

Language:

English

Submitter:

Pierre Fridez

Date Deposited:

11 Jul 2014 09:17

Last Modified:

07 Apr 2018 02:28

BORIS DOI:

10.7892/boris.45910

URI:

https://boris.unibe.ch/id/eprint/45910

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