Abstract
Rain and icecrystal depolarization measurements were made on earthspace paths at four locations across Canada using the circularlypolarized 11.7 GHz beacon transmission from thectssatellite. Results show that when rain is the dominant depolarization mechanism, crosspolarization discrimination (xpd)is statistically related to copolar attenuation (cpa)according toxpd =U−20 logcpawith U showing improvement with increasing elevation angle. Icecrystal depolarization events, with accompanying differential phase shifts as large as 20°, were also observed. An analysis separating these events from the data demonstrates that at 11.7 GHz icecrystal depolarization degradesxpdstatistics by less than 1 dB at the small percentages of time.
Analyse
On a mesuré la dépolarisation due à la pluie et aux cristaux de glace sur des trajets Terre-espace à quatre endroits au Canada, à l’aide d’un signal en polarisation circulaire émis à 11,7 GHz par le satellite technologique de télécommunication. On a constaté que, lorsque la pluie est le principal facteur de dépolarisation, le découplage de polarisation (xpd)présente un lien, statistiquement vérifié, avec l’affaiblissement copolaire (cpa)tel quexpd =U−20 logcpa,U s’améliorant à mesure de l’augmentation de l’angle de site. On a également observé des phénomènes de dépolarisation dus aux cristaux de glace où les déphasages différentiels ont atteint jusqu’à 20 degrés. Une analyse séparant ces grandeurs des données montre que la dépolarisation due aux cristaux de glace à 11,7 GHz dégrade les résultats statistiques relatifs au découplage de polarisation de moins de 1 dB pour de faibles pourcentages de temps.
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References
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Communication présentée au Colloque de la Commission F de l’URSI à Lenoxville (Canada) en mai 1980 «Effects of the lower atmospheric on radio propagation at frequencies above 1 GHz.
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Schlesak, J.J., Strickland, J.I. Circular cross-polarization measurements on earth-space paths at 11,7 GHz. Ann. Télécommun. 36, 477–482 (1981). https://doi.org/10.1007/BF03000028
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DOI: https://doi.org/10.1007/BF03000028
Key words
- Wave depolarization
- Measurement
- Centimetric wave
- Attenuation
- Electromagnetic wave propagation
- Hydrometeor
- Earth satellite propagation
- Statistical prediction
- Canada