Beside its GPS tracking receiver the German geoscience satellite CHAMP
is equipped with on-board instruments for measuring the acceleration due
to non-conservative forces as well as the attitude of the satellite body.
This considerably simplifies the treatment of the equations of motion 
inside the orbit parameter adjustment program EPOS-OC used at the
GeoForschungsZentrum Potsdam (GFZ) for CHAMP orbit determination. Models for
air drag, solar radiation pressure and earth albedo are no longer necessary
for integrating the dynamic equation of the spacecraft. The same applies to
a CHAMP attitude model. The orbit of CHAMP is computed from on-board GPS
measurements and evaluated by SLR data. Basically three different algorithmic
approaches are employed: The fully dynamic approach, the kinematic technique
and the mixed kinematic/dynamic approach. These three methods will be 
intercompared with respect to processing time, storage space and the precision
of the estimated orbits and the best application of each technique for the 
generation of the various CHAMP related products.