Abstract
A closed-loop simulation is set up in order to study in detail regional gravity modelling from GRACE-type observations. Thereby, potential differences between two satellites are simulated from a pre-defined mass trend signal, superimposed to a static background gravity model. These simulated observations are used for regional gravity field analysis with spherical radial basis functions. Finally, we use EOF analysis to identify the trend in gravity potential from a time series of 15-days quasi-static snapshots. Regional gravity modelling on the sphere is fairly complex and introduces approximation errors and artificial effects. In order not to mix up these errors with noise from the observations, we currently use noise-free observations. The model provides a versatile tool for detailed investigation of the data analysis method. Validation of the results is performed by comparison of input and output gravity change.
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