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A CHAMP‐only gravity field model from kinematic orbits using the energy integral
Author(s) -
Gerlach Ch.,
Földvary L.,
Švehla D.,
Gruber Th.,
Wermuth M.,
Sneeuw N.,
Frommknecht B.,
Oberndorfer H.,
Peters Th.,
Rothacher M.,
Rummel R.,
Steigenberger P.
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl018025
Subject(s) - gravitational field , geodesy , satellite , orbit (dynamics) , physics , kinematics , a priori and a posteriori , field (mathematics) , gravitation , gravitational potential , potential energy , classical mechanics , geophysics , geology , mathematics , astronomy , aerospace engineering , philosophy , epistemology , pure mathematics , engineering
In this paper we present results of a global gravity field recovery using half a year of CHAMP data. We use the energy integral of the motion of a satellite to transform satellite velocities into values of gravitational potential. The feasibility of this approach has already been demonstrated by several groups, using CHAMP reduced‐dynamic orbits. We show, that the potential recovered from this kind of orbits depends on the a priori gravity field used for orbit determination. Thus, it cannot be excluded that errors present in the prior field propagate into the new CHAMP gravity model. It is the intention of this paper to avoid this dependency through the use of kinematic orbits, which are free from prior information. The derived potential model, TUM‐1S, is validated by comparison to ground data and by satellite orbit residuals. It is shown to be comparable in quality to other state‐of‐the‐art gravity field models.