Summary
The GOCE mission, planned to be launched in autumn 2006, will allow to determine the static Earth gravity field down to features of 100 km-70 km (half wavelength) in terms of spatial resolution. Since satellite gradiometry is restricted to the medium- to short-wavelength part of the gravitational spectrum, only its combination with satellite-to-satellite measurements in the high-low mode will meet the mission requirements as demanded by the ESA, namely a high-accurate GOCE-only terrestrial gravity field modeling. Here we apply the acceleration approach which is predominantly characterized by numerical differentiation of the kinematic GOCE orbit. Gradiometry is treated by analysis of the fundamental invariants of the gravitational tensor. These quantities neither depend on reference frame rotations nor on the orientation of the gradiometer frame in space. Linearization, computational effort and amalgamation of tensor elements provided with different levels of accuracy make this approach hard to handle. The use of high performance computing facilities, parallel programming standards and optimized numerical libraries are the key to accomplish efficient gravity field recovery.
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Baur, O., Grafarend, E.W. (2006). High-Performance GOCE Gravity Field Recovery from Gravity Gradient Tensor Invariants and Kinematic Orbit Information. In: Flury, J., Rummel, R., Reigber, C., Rothacher, M., Boedecker, G., Schreiber, U. (eds) Observation of the Earth System from Space. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-29522-4_17
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