Time-variable gravity field determination from GRACE-FO data at AIUB

Lasser, Martin; Meyer, Ulrich; Arnold, Daniel; Jäggi, Adrian (October 2019). Time-variable gravity field determination from GRACE-FO data at AIUB (Unpublished). In: GRACE and GRACE-FO Science Team Meeting. Pasadena, CA, USA. October 8-10, 2019.

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Time-variable gravity field determination from GRACE-FO data at AIUB We study gravity field determination from GRACE-FO satellite-to-satellite tracking using the inter-satellite-link (KBR and LRI) and kinematic positions of the satellites as observations. The kinematic positions are obtained from a precise point positioning where the carrier phase ambiguities are fixed to integer values. We use a simplified stochastic model based on epoch-wise covariance information, which may be efficiently derived in the kinematic point positioning process, and extend this model by an empirical noise model derived from the residuals of a reduced-dynamic orbit fit of the kinematic positions to correctly characterise their stochastic behaviour. We also study empirical covariances of range-rate observations to characterise the inter-satellite-link noise. Furthermore, we investigate the interplay between the empirical noise model and the stochastic parameters of our celestial mechanics approach. We validate the performance of undifferenced ambiguity-fixed kinematic positions for GRACE-FO gravity field determination by analysing the residuals of combined orbits calculated using both kinematic positions and K-band data, and by analysing the quality of co-estimated gravity field solutions. We extend our validation to a first comparison of the K-band and laser-link range-rate observations.

Item Type:

Conference or Workshop Item (Speech)

Division/Institute:

08 Faculty of Science > Institute of Astronomy

UniBE Contributor:

Lasser, Martin; Meyer, Ulrich; Arnold, Daniel and Jäggi, Adrian

Subjects:

500 Science > 520 Astronomy

Language:

English

Submitter:

Pierre Fridez

Date Deposited:

20 Jan 2020 10:36

Last Modified:

20 Jan 2020 10:36

BORIS DOI:

10.7892/boris.138486

URI:

https://boris.unibe.ch/id/eprint/138486

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