Jens Wickert

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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)
G. Beyerle, GeoForschungsZentrum Potsdam (GFZ), Department 1, Geodesy and Remote Sensing, Telegrafenberg, D-14473 Potsdam, Germany (e-mail: gbeyerle@gfz-potsdam.de) S. Heise, GeoForschungsZentrum Potsdam (GFZ), Department 1, Geodesy and Remote Sensing, Telegrafenberg, D-14473 Potsdam, Germany (e-mail: stefan.heise@gfz-potsdam.de) G. König-Langlo, Alfred(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)
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)
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)
[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)
In this study the global lapse-rate tropopause (LRT) pressure, temperature, potential temperature, and sharpness are discussed based on Global Positioning System (GPS) radio occultations (RO) from the German CHAMP (CHAllenging Minisatellite Payload) and the U.S.Argentinian SAC-C (Satelite de Aplicaciones Cientificas-C) satellite missions. Results with(More)
G. Beyerle, GeoForschungsZentrum Potsdam (GFZ), Department 1, Geodesy and Remote Sensing, Telegrafenberg, D-14473 Potsdam, Germany (e-mail: gbeyerle@gfz-potsdam.de) G. Michalak, GeoForschungsZentrum Potsdam (GFZ), Department 1, Geodesy and Remote Sensing, Telegrafenberg, D-14473 Potsdam, Germany (e-mail: michalak@gfz-potsdam.de) Ch. Reigber,(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)