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Ground-based GPS receivers measure the Zenith Total Delay (ZTD) in mm which is the sum of the Zenith Hydrostatic Delay (ZHD) caused by the atmospheres dry components and the Zenith Wet Delay (ZWD) resulting
The GPS network has been set up by the cooperation between the GFZ (Galina Dick) and the Service d'Aeronomie (Paris, France). The data from 209 and 84 stations in the COPS domain are processes by both
Measurement systems available at supersite H (instrument type, operating institution): Lidar, DIAL, University Hohenheim; Lidar, Raman, University Hohenheim; Lidar, Doppler, University Karlsruhe/ Forschungszentrum