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Degradation in accuracy of gravity variations from CHAMP, GRACE, and GOCE

Jaroslav Klokocnik(1) and Jan Kostelecky(2)

(1) Astronomical Institute Czech Acad. Sci., Fricova 1, 251 65, Czech Republic
(2) Research Institute of Geodesy, Ondrejov 244, 251 65 Ondrejov, Czech Republic

Abstract

Due to orbit resonance 61/4 of GRACE, accuracy of the monthly solutions for gravity field variations significantly decreased. This was already discussed elsewhere, also by the authors of this presentation. Our new analysis show the problem of the degradation in the accuracy in more general light, as a product of orbit evolution (encountering various resonances and inevitable decrease of density of ground tracks) and as a function of latitude (with unexpected behavior for GRACE). We summarize our results for CHAMP and GRACE and comment on GOCE orbit as a warning for future analysis of data from this mission. Although the situation is very different with GOCE than with CHAMP and GRACE, the latitudinal dependence of the density of ground tracks and the effects of the ‘tail” of 16/1 resonance and lower resonances for different orbit scenarios should be studied in a detail.

 

Workshop poster

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry