Abstract
Depolarization and attenuation of radiowaves along earth-space paths due to rain storms are characterised. Frequency-dependent expressions for specific attenuation and phase shift at (PC and 20°C and for Laws-Parsons raindrop size distribution are given. Using small amplitude and phase approximations, a simple relation for cross-polar discrimination due to rain in terms of co-polar attenuation, frequency, angle of elevation and polarization angle is derived. Expressions for depolarization due to ice crystals are given, treating them as Rayleigh scatterers of spheroidal shape. For both rain and ice the relationship between linear and circular crosspolar ratio can be shown to be simply sin 2 θ, where θ is the polarization angle.
Analyse
On caractérise pour les liaisons Terre-satellite la dépolarisation et l’affaiblissement des ondes électromagnétiques causés par les hydrométéores. On présente des expressions pour l’affaiblissement linéique et le déphasage linéique en fonction de la fréquence à 0°C et 20°C pour une distribution de la dimension des gouttes conforme à la loi de Laws-Parsons. En utilisant une approximation pour les petites amplitudes et phases, on déduit une expression simple pour le découplage de polarisation en fonction de l’affaiblissement de la composante copolaire, la fréquence, l’angle de site et l’angle de polarisation. On présente des expressions pour la dépolarisation par les particules de glace. Les particules sont traitées comme des diffuseurs de Rayleigh sphéroïdaux. On montre que pour la pluie et la glace, la relation entre les découplages pour les polarisations rectilignes et circulaires est simplement sin 2 θ si θ est l’angle de polarisation.
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Dissanayake, A.W., Haworth, D.P. & Watson, P.A. Analytical models for cross-polarization on earth-space radio paths for frequency range 9–30 GHz. Ann. Télécommunic. 35, 398–404 (1980). https://doi.org/10.1007/BF03003518
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DOI: https://doi.org/10.1007/BF03003518
Key words
- Wave propagation
- Centimetric wave
- Wave attenuation
- Wave depolarization
- Hydrometeor
- Rain
- Satellite communication
- Mathematical model