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In-flight validation and monitoring of gradiometric GOCE data

Michael Kern(1), Haagmans Roger(1), Gernot Plank(1), Rune Floberghagen(1) and Mark Drinkwater(1)

(1) ESA, Keplerlaan 1, 2200 AG Noordwijk ZH, Netherlands

Abstract

The European Space Agency's Gravity field and steady-state Ocean Circulation Explorer (GOCE) Mission will be the first of ESA’s Core Earth Explorer satellite missions. Mission goals are to determine the Earth’s gravity field and its anomalies with an accuracy better than 1 mGal, and the global geoid with an accuracy better than 1-2 cm at a spatial resolution of 100 km or better. To meet these goals, the satellite instruments will undergo a series of calibration procedures before launch and in flight. In flight, the gradiometer will be calibrated prior to the measurement phases by the so-called in-flight calibration, which makes use of a unique satellite and proof mass shaking set-up and calibration techniques. Ultimately, the gradiometric measurements are externally calibrated using external gravity information over well-survey areas and global gravity field models.

This paper studies novel concepts to monitor and validate the quality of the gradiometer data in flight. This may be done by using satellite-only information, but could also involve external information (global gravity field models and alike). The concepts should provide a quick quality assessment of the gradiometric components. Special emphasis will be placed on the issues and inherent assumptions for such algorithms. An outlook will be given and numerical examples will be shown that demonstrate the potential of the proposed concepts.

 

Workshop presentation

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