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 Assessment of reduced-dynamic GRACE/GRACE-FO oribt co-estimated with monthly gravity fields (Unpublished).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.

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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.

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