An enhanced space-wise simulation for GOCE data reduction

Polar gaps effects, gridding effects and noise propagation from GOCE Trr data into harmonic coefficients estimates, by the so-called space-wise approach, have been extensively studied. To this aim two techniques are possible, namely the fast spherical collocation and the numerical integration. Recently the conclusion has been drawn that the two methods are almost equivalent, though collocation reveals to be more robust against aliasing and polar gaps. Now several generalizations need to be implemented and integrated in order to come to a final architecture of the software. The integration of non-radial components and the effects of small rotations are presented in a parallel paper. In this work we aim at integrating the information coming from Trr, Tr and T data, in order to better understand the improvement in the low frequency band. To obtain this result, we simulated a realistic data grid on a spherical boundary, implementing a realistic (and close to optimal) grid step and including realistic polar gaps effects.