Regularization of geopotential determination from satellite data by variance components |
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| Authors: | K-R Koch J Kusche |
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| Institution: | (1) Institute for Theoretical Geodesy, University of Bonn, Nussallee 17, 53115 Bonn, Germany e-mail: koch@theor.geod.uni-bonn.de; Tel.: +49-228-73-3395; Fax: +49-228-73-3029, DE;(2) Delft Institute for Earth-Oriented Space Research (DEOS), Delft University of Technology, Thijsseweg 11, 2629 JA Delft, The Netherlands; e-mail: j.kusche@citg.tudelft.nl; Tel.: +31-1527-82562; Fax: +31-1527-83711, NL |
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| Abstract: | Different types of present or future satellite data have to be combined by applying appropriate weighting for the determination
of the gravity field of the Earth, for instance GPS observations for CHAMP with satellite to satellite tracking for the coming
mission GRACE as well as gradiometer measurements for GOCE. In addition, the estimate of the geopotential has to be smoothed
or regularized because of the inversion problem. It is proposed to solve these two tasks by Bayesian inference on variance
components. The estimates of the variance components are computed by a stochastic estimator of the traces of matrices connected
with the inverse of the matrix of normal equations, thus leading to a new method for determining variance components for large
linear systems. The posterior density function for the variance components, weighting factors and regularization parameters
are given in order to compute the confidence intervals for these quantities. Test computations with simulated gradiometer
observations for GOCE and satellite to satellite tracking for GRACE show the validity of the approach.
Received: 5 June 2001 / Accepted: 28 November 2001 |
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| Keywords: | : Geopotential Determination – Regularization – Variance Components – Bayesian Statistics – Confidence Intervals |
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