High rate low latency GPS ground tracking network for CHAMP

High Rate / Low Latency GPS ground measurements for the GPS occultation exp eriment of the Challenging Minisatellite Payload (CHAMP) mission are provid ed by a dedicated global tracking network. The network is being established jointly by GFZ and Jet Propulsion Laboratory (JPL) to ensure adequate grou nd data availability for processing of globally distributed GPS occultation events. GFZ operates a sub-network, which is currently composed of 11 stat ions. This paper discusses various scientific and technical issues such as network topology design, requirements for an autonomous and continuously op erating GPS ground tracking station, near real time data transfer, interfac es and operational data flow. (C) 2001 Elsevier Science Ltd. All rights res erved.