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Gravity Field Determination Using Multiresolution Techniques

Dr Michael Schmidt(1), Oliver Fabert(1) , Shin-Chan Han(2) , and C.K. Shum(2)

(1) Deutsches Geodätisches Forschungsinstitut, Marstallplatz 8, 80539 München, Germany
(2) The Ohio State University, 2070 Neil Avenue, Columbus, Ohio 43210, United States

Abstract

The precise GOCE gradiometer measurements are anticipated to produce a geopotential model with 1 cm rms geoid accuracy and wavelengths longer than 160 km. We present results for modeling the Earth's gravitational field using spherical wavelets and applying methodologies for the estimation of the corresponding coefficients. The observation types in our techniques could either be gravity gradient tensor measurements from the GOCE gradiometer, or other gravity mapping mission data such as the GRACE low-low intersatellite KA-band range-rate, or CHAMP high-low intersatellite GPS phase data, or a combination of all the data types. Our approach combines a spherical harmonics part with an appropriate spherical wavelet representation. Using appropriate techniques for the solution of the resulting normal equation system, wavelet coefficients up to certain detail level can be estimated. Techniques for optimized downward continuations will be discussed with applications for local gravity signal enhancement as well as comparison with in situ data. Finally, we will provide a demonstration of the developed methodology using CHAMP data.

 

Workshop presentation

Full paper

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

GOCE04