H/R GPS Ground Tracking Network for CHAMP Roman Galas, Christoph Reigber, Jens Wickert. GeoForschungsZentrum Potsdam (GFZ) Telegrafenberg, 14473 Potsdam Division Kinematics & Dynamics of the Earth. The support of High Rate GPS Ground Observations for the GPS occultation experiment of the CHAMP mission will be provided by a dedicated global tracking network. The network is being established by GFZ and JPL. GFZ suggested a subnetwork, composed of 8 to 12 stations distributed to ensure global coverage of the occultation events. The poster presents various scientific and technical issues such as: network topology, requirements for autonomous continuously operating stations, near real data transfer, interfaces and data flow.