Assessment of reduced-dynamic GRACE/GRACE-FO oribt co-estimated with monthly gravity fields

Lasser, Martin; Meyer, Ulrich; Arnold, Daniel; Jäggi, Adrian (February 2021). Assessment of reduced-dynamic GRACE/GRACE-FO oribt co-estimated with monthly gravity fields (Unpublished). In: 43rd COSPAR Scientific Assembly. Sydney, Australia (online). Jan. 28 – Feb. 4, 2021.

[img]
Preview
Text (Presentation)
cospar2021_las.pdf - Presentation
Available under License Creative Commons: Attribution (CC-BY).

Download (1MB) | Preview

We study the orbits co-estimated in gravity field determination applying the Celestial Mechanics Approach (CMA) developed at the Astronomical Institute, University of Bern (AIUB) using kinematic positions derived from high-low GPS satellite-to-satellite tracking, and low-low K-band-satellite-to-satellite tracking data from GRACE/GRACE-FO. Gravity field coefficients and arc-specific parameters describing a reduced-dynamic orbit are jointly estimated in a common least squares adjustment. We show the influence of using undifferenced integer-ambiguity-fixed kinematic orbits on the co-estimated orbits compared to the use of an undifferenced float solution, especially in view of their stochastic behaviour. We also discuss a commonly observed discrepancy between GPS and K-band observations, which usually asks to additionally (artificially) down-weight the GPS observations with respect to the K-band observations. We validate the derived orbits, by analysing the residuals of combined orbits calculated using both kinematic positions and K-band data, and by analysing the quality of the 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 and Jäggi, Adrian

Subjects:

500 Science > 520 Astronomy

Language:

English

Submitter:

Pierre Fridez

Date Deposited:

12 Feb 2021 14:39

Last Modified:

12 Feb 2021 14:39

Additional Information:

Presentation

BORIS DOI:

10.48350/152088

URI:

https://boris.unibe.ch/id/eprint/152088

Actions (login required)

Edit item Edit item
Provide Feedback