The knowledge of wind vector fields throughout the atmosphere is extremely desirable for both meteorological research and operational applications. While with conventional emthods for deriving wind vecotr fieds within precipitaiton, e.g., combining two Doppler weather radars (Fig. 1, monostati dual-Doppler) at a distance between 40-80 km are quite expensive. An alternatice could be a bistatic multiple Doppler technique where several inexpensive receivers are grouped around a trasmitting/receiving radar system (Figs. 1 and 2). Large parts of my dissertation focuses on otimal setup, a;gorithm development, and antenna configurations, and wind synethesis. Followed up publications show results and potential applications.

This system is currently operating at the German Aerospace Center (Deutsches Zentrum fuer Luft- und Raumfahrt, DLR) in Oberpfaffenhofen near Muncih. Figure 3 shows an example of wind measurements during a thinderstorm event during the VERTIKATOR field campaign. About one hour later the convective cell south-southeast of the radar developed a severe downburst.

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Friedrich, K., M. Hagen, and T. Einfalt, 2006: A quality control concept for radar reflectivity, polarimetric parameters, and Doppler velocity. J. Atmos. Ocean Technol., 23, 865-887.

Friedrich, K., and M. Hagen, 2004: Evaluation of wind vectors measured by a bistatic Doppler radar network. J. Atmos. Oceanic Technol., 21, 1840-1854.

Friedrich, K., and M. Hagen, 2004: On the use of advanced Doppler radar techniques to determine horizontal wind-fields for operational weather surveillance. Meteor. Appl., 11, 155-171.

Friedrich, K., and O. Caumont, 2004: Dealiasing Doppler velocities measured by a bistatic radar network during a downburst-producing thunderstorm. J. Atmos. Oceanic Technol., 21, 717-729.

Friedrich, K., and M. Hagen, 2004: Wind synthesis and quality control of dual-Doppler derived horizontal wind-fields. J. Appl. Meteor., 43, 38-57.

Friedrich, K., 2002: Determination of three-dimensional wind-vector fields using a bistatic Doppler radar network. Ph.D. thesis, Dep. of Physics, Ludwig-Maximilians University Munich; 135 pp., DLR-FB2002-05.