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The latest test of the space-wise approach for GOCE data analysis

Federica Migliaccio(1), Mirko Reguzzoni(2), Fernando Sansò(3), Nikolaos Tselfes(3), Carl C. Tscherning(4) and Martin Veicherts(4)

(1) Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy
(2) OGS - c/o Politecnico di Milano, Via Valleggio, 11, 22100 Como, Italy
(3) Politecnico di Milano, Via Valleggio, 11, 22100 Como, Italy
(4) University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark

Abstract

A new set of E2E (end-to-end) simulated data for the GOCE mission has been recently produced by the European Space Agency and used for extensive testing of the procedures for the estimation of the gravity field. These data set spans 60 days and includes the satellite state vector data and orientation parameters, the measured gravity gradients and the measured non gravitational accelerations. These data have been contaminated by realistic in-flight calibration noise and other systematic effects, like biases, which make the analysis more difficult but also representative of the real case and meaningful.

The space-wise solution procedure has been applied to the E2E data with very promising results. However some routines of the procedure had to undergo further tuning with respect to previous experiments. In fact, calibration methods have been used to estimate biases for the common-mode accelerations and long wavelength effects for the gravity gradients, before these data could enter the basic processing chain. In this experiment for the first time a real combination of the energy integration solution and the gradiometry solution has been achieved, which permits also the accurate estimation of low degree coefficients. Moreover it has been found that the information of the GOCE data can be used to resolve for coefficients beyond degree 200 with a commission geoid error of the order of centimetres.

The final step of the space-wise approach, which is the estimation of the gravitational potential coefficients from gridded data, has been performed by three different methods: collocation, integration and exact Fourier analysis. The results are presented here and the choice of the method is justified via the results of the simulation. The theoretical justification of this choice is discussed in another paper.

 

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