Tuesday 23 August 2005

G2

PT0021
Gravity field solution from CHAMP mission inverting Poisson's integral with multi parameter regularization
Garcia, Ramon¹, Moraila, Carlos¹, Alejo, Castulo²
1 University Autonomous Of Sinaloa, Mexico
2 Sinaloa Science Center, Mexico
Author email: rgarcia@uas.uasnet.mx
An analysis is made on the regularization of the downward continuation of in-situ disturbing potential values as produced by CHAMP mission through the conservation of energy principle. The downward continuation to the Earth surface is performed by the inversion of Poisson's integral. The inversion is implemented with the 1D and 2D FFT deconvolution processes. The last one is applied in a multi band fashion in order to reduce the meridians convergence error. On both methods, the Tikhonov regularization parameter values are modeled with lineal and second order polynomial variations to account for the condition number variation of the sub-systems involved with respect to latitude. Some tests made shows improvements of solution with respect to using only one regularization parameter. CHAMP mission data sets of 30 days are processed to analyze the performance of the methods analyzed. For a global 5x5 degrees grid solution, tests made indicate a better performance when comparing to global solutions based on spherical harmonic expansion and single regularization parameter integral inversion.

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