Motivated by the problem of satellite gravity gradiometry, which is the reconstruction of the Earth gravity potential from the satellite data provided in the form of the second-order partial derivatives of the gravity potential at a satellite altitude, we discuss a special regularization technique for solving this severely ill-posed problem in a spherical framework. We are especially interested in the regularized collocation method. As a core ingredient we present an a posteriori parameter choice rule, namely the weighted discrepancy principle, and prove its order optimality. Finally, we illustrate our theoretical findings by numerical results for the computation of the Fourier coefficients of the gravitational potential directly from the noisy synthetic data.
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The authors are supported by the Austrian Fonds Zur Forderung der Wissenschaftlichen Forschung (FWF), Grant P25424.
Dedicated to Willi Freeden’s 65th Birthday.
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Naumova, V., Pereverzyev, S.V. & Tkachenko, P. Regularized collocation for spherical harmonics gravitational field modeling. Int J Geomath 5, 81–98 (2014). https://doi.org/10.1007/s13137-013-0054-9
- Ill-posed problem
- Collocation method
- Discrepancy principle
- Satellite gravity modeling
- Spherical harmonics
Mathematics Subject Classification (2000)