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Contribution of modern satellite tracking data to GOCE-based gravity solutions

Oleg Abrikosov(1), Frank Flechtner(1), Christoph Förste(1), Ulrich Meyer(1), Markus Rothacher(1) and Roland Schmidt(1)

(1) GeoForschungzZentrum Potsdam, Telegrafenberg A17, 14473, Germany

Abstract

On the basis of GOCE data simulated along perturbed orbits of different lengths and contaminated by a realistic noise, we have derived gravity field solutions from (1) 4 components of the gravity gradient tensor that are expected to be measured with a high accuracy during the GOCE mission, (2) GOCE positions used as pseudo-observations and processed by means of the direct approach based on numerical integration, (3) accelerations derived from the GOCE positions by means of the numerical differentiation. All the GOCE-only results suffer from the polar gaps and the uneven distribution of the data over altitude. To suppress the corresponding errors in the gravity field recovery, we were forced to apply regularization methods. Also, gravity field combined solutions were derived from the simulated GOCE and GRACE data. The impact of all mentioned data sets and their different combinations on the quality of the satellite-derived gravity models has been analyzed.

 

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