Gravity Field Recovery from GRACE: Unique Aspects of the High Precision Inter-Satellite Data and Analysis Methods |
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Authors: | Balmino G |
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Institution: | (1) Centre National d'Etudes Spatiales, GRGS, Toulouse, France ( |
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Abstract: | The very high accuracy of the Doppler and range measurements between the two low-flying and co-orbiting spacecraft of the
GRACE mission, which will be at the μm/sec and ≈10 μm levels respectively, requires that special procedures be applied in
the processing of these data. Parts of the existing orbit determination and gravity field parameters retrieval methods and
software must be modified in order to fully benefit from the capabilities of this mission. This is being done in the following
areas: (i) numerical integration of the equations of motion (summed form, accuracy of the predictor-corrector loop, Encke's
formulation): (ii) special inter-satellite dynamical parameterization for very short arcs; (iii) accurate solution of large
least-squares problems (normal equations vs. orthogonal decomposition of observation equations); (iv) handling the observation
equations with high accuracy. Theoretical concepts and first tests of some of the newly implemented algorithms are presented.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | low-low satellite-to-satellite tracking global gravity modelling numerical integration large inverse problem |
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