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GOCE Quick-Look Gravity Field Analysis (QL-GFA) in the Framework of HPF

Roland Pail(1), Barbara Lackner(1), Bernhard Metzler(1), Thomas Preimesberger(1) and Martin Wermuth(2)

(1) Graz University of Technology, Steyrergasse 30, 8010 Graz, Austria
(2) Technical University Munich, Arcisstrasse 21, 8033 Munich, Germany

Abstract

The Quick-Look Gravity Field Analysis is a component of the Routine & Rapid Processing Facilities in the framework of the ESA-funded project “GOCE High-level Processing Facility”, an operational hardware and software system for the scientific processing (Level 1B to Level 2) of GOCE data, in order to derive a spherical harmonic Earth’s gravity field model from the precise GOCE orbit based on satellite-to-satellite tracking (SST) in high-low mode, and satellite gravity gradiometry (SGG) data.

The purpose of the QL-GFA is to analyze partial and/or incomplete sets of SGG and SST data, in order to derive a fast diagnosis of the GOCE system performance in parallel to the mission.

Key products of QL-GFA are: • Quick-look gravity field models (SGG only, SST only, combined SST+SGG): They are computed for a fast analysis of the information content of the input data on the level of the gravity field solution. • Estimates of the gradiometer error PSD (power spectral density): These are computed from the residuals of a SGG-only gravity field analysis. Previously defined statistical hypothesis test strategies in time and frequency domain are applied in order to answer the question whether the a priori gradiometer error model, and thus the stochastic model of the parameter adjustment, is realistic.

The poster gives an overview of the operational QL-GFA software system. On the basis of a realistic numerical case study, which is based on the data of an ESA GOCE end-to-end simulation, the key components of the QL-GFA processing architecture are addressed, and the information content of all relevant output products is presented and discussed.

 

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