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We describe the status of the assimilation of bending angles from GPS  radio occultations in the 3D-Var for DWD's operational global forecast  model GME ("Global Model for Europe").  Experiments show that the assimilation of GPSRO data leads to a  significant reduction of biases in the analyses of temperature, humidity  and wind in the upper troposphere and the stratosphere, as well as a  better r. m. s. fit in the comparison to radiosondes. The impact on  forecasts is most prominent in the data sparse Southern Hemisphere, but is  also quite notable in the Northern Hemisphere extra-tropics.  The positive results  found in the impact experiments lead to the implementation of the  assimilation of GPS radio occultations from GRACE-A, FORMOSAT-3/COSMIC  and GRAS/MetOp-A into the operational suite on 3 August 2010. We also  show some initial results from assimilation experiments using radio  occultation data from the German research satellite TerraSAR-X

Assimilation of GPS radio occultation data at DWD