engleski

Comparison of Different Gravity Field Solution Methods Applied to CHAMP Gravity Field Modelling

The new gravity field satellite missions CHAMP, GRACE and GOCE are expected to deliver a new generation of gravity field models with unprecedented accuracy and resolution. However the large number of measurements as well as the large number of unknowns are posing new challenges in terms of computing strategies. Several competing methods for gravity field analysis, each having advantages and drawbacks, have been developed during the past years. A selection of them, namely the Direct Approach, the Pre-Conditioned Conjugate-Gradient Multiple-Adjustment (PCGMA) (cf. Schuh, 1996) and the Lumped-Coefficient Approach (cf. Sneeuw, 2000) are compared and evaluated here with real data delivered by CHAMP. The different gravity field solution methods and the resulting potential coefficients are tested and compared in terms of computation time, accuracy and spatial resolution.

CHAMP; GRACE; GOCE gravity field solutions; computing methods

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