Evaluation of dual polarization scattering matrix radar rain backscatter measurements in the X- and Q-bands
Abstract
This paper presents an evaluation of polarimetric rain backscatter measurements collected with coherent dual polarization radar systems in the X (8.9 GHz) and Q (45GHz) bands, the first being operated in a pulsed mode and the second being a FM-CW system. The polarimetric measurement data consisted for each band of fifty files of time-sequential scattering matrix measurements expressed in terms of a linear (H, V) antenna polarization state basis. The rain backscattering takes place in a rain cell defined by the beam widths and down range distances of 275 ft through 325 ft and the scattering matrices were measured far below the hydrometeoric scattering center decorrelation time so that ensemble averaging of time-sequential scattering matrices may be applied. In the data evaluation great care was taken in determining: (1) polarimetric Doppler velocities associated with the motion of descending oscillating raindrops and/or eddies within the moving swaths of coastal rain showers, and (2) also the properties of the associated co/cross-polarization rain clutter nulls and their distributions on the Poincare polarization sphere.
- Publication:
-
5th International Conference on Antennas and Propagation
- Pub Date:
- 1987
- Bibcode:
- 1987icap.conf..243A
- Keywords:
-
- Backscattering;
- Cross Polarization;
- Radar Scattering;
- S Matrix Theory;
- Meteorology;
- Rain;
- Time Dependence;
- Communications and Radar