Summary

Several aspects of using GPS ground station data for the realization of the CHAMP Atmospheric Profiling experiment are discussed. First, the profiling activities at GFZ Potsdam are shortly described. Results of simulation runs of the CHAMP occultation experiments using the JPL & GFZ network configurations to study the relationship between network topology and attainable global coverage of occultation events are discussed. Latency aspects are studied in view of the challenging future task of providing atmospheric occultation data for operational weather forecast. Furthermore, 1 Hz data of Dunedin GPS ground station of May 2, 2000 are used to investigate a possible reduction of the required data rate for occultation data as a result of the termination of SA