First champ mission results for gravity, magnetic and atmospheric studies

By K. Whaler, C. Reigber, Hermann Lühr, P. Schwintzer. 2003

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Thermospheric Density and Wind Determination from Satellite Dynamics (2012, methodology): “The three major precise tracking systems in use today are satellite-to-satellite tracking using the GPS system [23], two-way Satellite Laser Ranging (SLR) from a network of laser stations to dedicated reflectors on satellites [54] and one-way Doppler radio tracking using the French network of DORIS ”
The Radio Occultation Experiment aboard CHAMP: Operational Data Analysis and Validation of Vertical Atmospheric Profiles (2004, result): “In contrast to Marquardt et al. (2003) or Wickert et al. (2001b) we validate the current version of atmospheric data products (004), which is available via ISDC.”
CHAOS—a model of the Earth's magnetic field derived from CHAMP, Ørsted, and SAC‐C magnetic satellite data (2006, methodology): “The same model parametrization was chosen for the CO2 model (Holme et al. 2003); however, CHAMP vector and scalar and SAC-C scalar data had been used in addition to the Ørsted data.”