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

Lasser, Martin; Meyer, Ulrich; Arnold, Daniel; Jäggi, Adrian (October 2020). Time-variable gravity field determination from GRACE-FO data at AIUB (Unpublished). In: GRACE & GRACE FO Science Team Meeting. Online. October 26-29, 2020.

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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 K-band link and kinematic positions of the satellites as observations and pseudo-observations respectively. We employ 10-second kinematic positions from a precise point positioning where the undifferenced carrier phase ambiguities are fixed to integer values using observation-specific phase bias products from the CODE analysis centre. We present an up-to-date GRACE-FO time series computed with the Celestial Mechanics Approach extended by empirical noise models derived from the post-fit residuals to better characterise the stochastic behaviour of both observation types. We investigate the interplay between the empirical noise model and the co-estimation of stochastic parameters set-up to absorb unmodelled signal (short term mass variations, accelerometer errors etc.). We validate our results of 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.

Item Type:

Conference or Workshop Item (Speech)

Division/Institute:

08 Faculty of Science > Institute of Astronomy

UniBE Contributor:

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

Subjects:

500 Science > 520 Astronomy

Language:

English

Submitter:

Pierre Fridez

Date Deposited:

15 Nov 2021 12:04

Last Modified:

05 Dec 2022 15:54

Additional Information:

Presentation

BORIS DOI:

10.48350/160513

URI:

https://boris.unibe.ch/id/eprint/160513

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