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Here you will find the latest project related news, publications, posters and other activities within the FRM4RADAR project.

Further Development of Existing Radar Processing

Within the FRM4Radrar project the existing radar processing of the University of Cologne (UoC) was developed further (Maahn and Kollias, 2012, AMT; Küchler et al., 2017, AMT; Küchler ,2019, PhD thesis at UoC).

The basic function of the Matlab code is the unfolding of measured Doppler velocities, so known as Doppler velocity dealiaising. The example in Figure 1 displays an hour of folded and unfolded Doppler velocities.  Before the correction in a) a jump in the in the Doppler velocity filed from negative to positive is visible between 1.2 km and 2.3 km. Folded Doppler velocities effect not only the velocity field also higher radar moments are affected (Doppler spectrum width, Skewness). Therefore, an unfolding of the Doppler velocity is necessary for a correct interpretation of the measurements. The code unfolds the Doppler velocity by shifting the measured Doppler spectra. The result of the unfolding is shown in Figure 1 b) where the jump in the velocities is gone and the velocity field shows conclusive values.

The updated processing is able to dealiaise measurements for profiling radars of RPG (RadiometerPysics GmbH). This includes the two raw data files of the instruments un- and compressed and unfolds Doppler spectra and co-spectra can calculated all relevant moments (Ze, vm, sk, ku, and Ldr). The data output is given in GEOMS conform NetCDF files. For mor documentation and to download the code visit github.