Optimal combination of integral solutions of gradiometric boundary value problem using variance component estimation in Earth gravitational modelling
2010 (English)In: Earth Planets and Space, ISSN 1343-8832, Vol. 62, no 5, 437-448 p.Article in journal (Refereed) Published
Optimal estimation of geopotential coefficients is an important aspect of gravitational field recovery using satellite gravity gradiometry. The combination of gradiometric data and the use of tensor spherical harmonics is useful in this field. Here, we present a new strategy for combining different spectral solutions of the gradiometric boundary value problem by defining and formulating degree-order variance components and using the condition adjustment model. Numerical results show that the spectral combination of considering one degree-order variance component for each type of observation yields better results than the case where one degree-order variance component is estimated for each integral solution of the gradiometric boundary value problem. In this study, the estimates of the variance components are not considered in the standard way; rather, these components are mainly used to absorb the discretization error of the integral solutions. This method is capable of combining integrals in geosciences disciplines.
Place, publisher, year, edition, pages
2010. Vol. 62, no 5, 437-448 p.
Degree-order variance component, optimal solution, degree of resolution, re-weighting process, stochastic model
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:kth:diva-29469DOI: 10.5047/eps.2010.01.002ISI: 000280138700001ScopusID: 2-s2.0-77955762211OAI: oai:DiVA.org:kth-29469DiVA: diva2:395841
QC 201102082011-02-082011-02-022012-06-12Bibliographically approved