For the measurements a test transmitter mounted on a tower and the scanning 35-GHz (Ka band) cloud radar MIRA-35, manufactured by METEK GmbH and operated in the receiving mode, were used. The patterns of two antennas of different quality were measured at the Hungriger Wolf airport near Hohenlockstedt, Germany, during the period from 28 January to 1 February 2014. Amplitude and phase of the copolar and cross-polar antenna patterns are presented and utilized. This paper presents an experimental analysis of the antenna system effects on polarimetric measurements conducted with cloud radars operating in the linear depolarization ratio (LDR) mode. (a) Observed and (b) corrected correlation coefficient, and (c) corrected LDR for the measurement taken with radar 1 at Elmshorn on. Observed correlation coefficient for (a) radar 1 and (b) radar 2, corrected correlation coefficient for (c) radar 1 and (d) radar 2, and corrected LDR for (e) radar 1 and (f) radar 2 for the same case as in Fig. Scatterplot of observed (red dots) and corrected (blue dots) values of LDR for radars 1 and 2 for the same case as in Fig. Vertical profiles of LDR for radars 1 and 2 for the same case as in Fig.
Ĭentralized probability density function, where. All the radii are with respect to the position and. Patterns of the phase differences for the (left) bad and (right) good antennas.Ĭut planes of over the azimuth, of over the elevation, and of over the azimuth for the (a) bad and (b) good antennas. Please note that scales for (a) and (d) differ from (b) and (c). Normalized amplitude antenna patterns for the (left) bad and (right) good antennas. The MIRA-35 cloud radar with the scanning unit at METEK GmbH. Vertical profiles of LDR for radars 1 and 2 at 2140 UTC (for the same case as in Fig. Please note that the amount of data points in (c) is less in comparison with (b) because of the lower sensitivity of radar 2. Time–height cross section of observed parameters: (a) Reflectivity for radar 1 (b) LDR for radar 1 and (c) LDR for radar 2, taken at Elmshorn, Germany, on.
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