De-polarisation due to non-symmetry in raindrops
Abstract
A raindrop depolarization model alternative to the conventional bun-shaped drop is considered where the depolarization occurs because of an asymmetric drop shape caused by drop mechanical vibration excited by turbulence in the wake of a falling drop. The drop asymmetry is modeled as a combination of a steady symmetric drop plus a small vibrating component which is assumed to be oriented at an angle to the main drop axis. The scattering dipoles are resolved into the plane normal to the incident wave vector. The model reduces to the conventional canting angle model but with a canting angle now dependent on vibration amplitude rather than on wind shear. The application of the model to rainfall effects is presented, showing depolarization as a function of rainfall rate and as a function of attenuation.
- Publication:
-
2nd International Conference on Antennas and Propagation
- Pub Date:
- 1981
- Bibcode:
- 1981icap.conf..101D
- Keywords:
-
- Atmospheric Scattering;
- Depolarization;
- Microwave Attenuation;
- Raindrops;
- Turbulent Wakes;
- Asymmetry;
- Drop Size;
- S Matrix Theory;
- Scattering Cross Sections;
- Turbulence Effects;
- Vibration Effects;
- Wave Scattering;
- Communications and Radar