Practical Relationships between Propagation and Meteorological Variables Derived from Videodistrometer Measurement and Its Ambiguity Discussion | Examples from Prague (CZ)

Abstract

In this contribution we discuss the possibilities of the distrometer or videodistrom-eter measurement. Firstly we describe brie°y what outputs are given through the videodistrom-eter measurement: equivolumetric rain drop diameter, fall velocity, oblateness etc. From these quantities we derive the one minute drop size distributions (DSDs) and from it pertinent radar refectivity factors Z, rain rates R, speci¯c rain attenuations of hypothetical microwave link A and rain kinetic energies Ek. 2017 and 2018 videodistrometer data from Prague were applied. Scatterplots EkR, EkZ A-Z and A-R are shown. In two last relations the unambiguity as a function of frequency was discussed it was observed that the unambiguity is maximal at 25 GHz frequency and minimal at 100 GHz for investigated frequencies from 10 to 100 GHz. For A-R relations the unambiguity was estimated also through the coe±cient of determination for the power law approximation.