Testing frame-transformation, gridding and filtering of GOCE gradiometer data by Least- Squares Collocation using simulated data.

Abstract: Least-squares collocation (LSC) has been used to test frame transformation, filtering and gridding of GOCE gradiometer data. Initially the function of the GRAVSOFT program GEOCOL was checked by using noise-free data with 5 s sampling provided by IAG along a 1 month realistic orbit. Data in a 2o x 2o area was used. For these data it was verified that 0.1o frame transformation and gridding in an interior 1o x 1o area of one quantity from the same quantity could be done with an error below 5 % of the signal standard deviation. If several components of the gravity gradient were used, the error decreased slightly. Noise with standard deviations of 0.050 an