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The first radio occultation measurements of the CHAMP (CHAllenging Minisatellite Payload) satellite using Global Positioning System (GPS) signals have been performed on February 11, 2001. By the end of April 2001 more than 3000 occultations were recorded. Globally distributed vertical profiles of dry temperature and specific humidity are derived, of which a(More)
  • Ding-Yi Wang, Gabriele P Stiller, Thomas Von Clarmann, Herbert Fischer, Manuel López-Puertas, Bernd Funke +15 others
  • 2004
[1] The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on board the ENVISAT and the Global Positioning System (GPS) receiver on the Challenging Mini-Satellite Payload (CHAMP) provide temperature profiles by limb-viewing midinfrared emission and radio occultation (RO) measurements, respectively. The MIPAS temperatures retrieved at the(More)
The operational data analysis of the GPS radio occultation experiment aboard the German CHAMP (CHAllenging Minisatellite Payload) satellite mission is described. Continuous Near-Real-Time processing with average time delay of ~5 hours between measurement and provision of analysis results is demonstrated. A delay of less than 3 hours is reached for(More)
  • Jens Wickert, Georg Beyerle, George A Hajj, Volker Schwieger, Christoph Reigber
  • 2002
[1] The GPS (Global Positioning System) radio occultation experiment onboard the German CHAMP (CHAllenging Minisatellite Payload) satellite was successfully started in February 2001. By the end of July 2001 more than 11,000 globally distributed vertical profiles of atmospheric temperature were derived. Operational data processing is based on the double(More)
The world of satellite navigation is undergoing dramatic changes with the rapid development of multi-constellation Global Navigation Satellite Systems (GNSSs). At the moment more than 70 satellites are already in view, and about 120 satellites will be available once all four systems (BeiDou + Galileo + GLONASS + GPS) are fully deployed in the next few(More)
The regional service of the Chinese BeiDou satellite navigation system is now in operation with a constellation including five Geostationary Earth Orbit satellites (GEO), five Inclined Geosynchronous Orbit (IGSO) satellites and four Medium Earth Orbit (MEO) satellites. Besides the standard positioning service with positioning accuracy of about 10 m, both(More)
Since the first successful radio occultation measurement taken by the GPS receiver onboard CHAMP, more than 40,000 vertical soundings of strato-spheric temperature and tropospheric humidity have been processed at GFZ Pots-dam. During the first year of the radio occultation experiment, several multi–week batches of quasi–continuous measurements have been(More)
A GNSS water vapour tomography system developed to reconstruct spatially resolved humidity fields in the troposphere is described. The tomography system was designed to process the slant path delays of about 270 German GNSS stations in near real-time with a temporal resolution of 30 min, a horizontal resolution of 40 km and a vertical resolution of 500 m or(More)
  • J Wickert, R Galas, T Schmidt, G Beyerle, Ch Reigber, Ch Förste +8 others
  • 2002
Fig. 1. Geometry for double difference processing of CHAMP's GPS radio occultation data. Involved are two satellite to satellite links (occulting and referencing GPS satellite to CHAMP) and two satellite to ground links (GPS satellites to the ground station). The atmospheric influence on the propagation of the GPS signal is characterized by the bending(More)