FM-CW Radar Remote Sensing of Hydrometeors,
TECHNISCHE HOGESCHOOL DELFT (NETHERLANDS)
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In order to investigate phenomena influencing co-polar attenuation and cross-polar discrimination along earth-space satellite paths and terrestrial radio links at frequencies above 10 GHz, the number density, geometry, and orientation of hydrometeors rain, snow, hail, melting particles etc. along the path have to be characterized. This paper describes the modelling of the melting process, the dielectric properties of melting particles, and fall velocity behavior of hydrometeors for Doppler velocity computation with vertically pointing radars. Attention is paid to backward scattering of ellipsoidal hydrometeors for radar polarimetry computations at arbitrary elevation angles, and to forward scattering of spherical hydrometeors for attenuation computations at high frequencies. The multi-parameter FM-CW radar systems of Delft University of Technology is able to measure the polarization properties and Doppler velocity spectra of hydrometeors with high resolution in range and reflectivity level. Preliminary results obtained with this radar system are shown, indicating the capabilities of combined Doppler- and polarimetry measurements for classification of hydrometers along a satellite path.
- Radiofrequency Wave Propagation
- Active and Passive Radar Detection and Equipment