This thesis presents a frequency scaling model based on a physical approach from Ka to EHF bands. The scaling is compared with the well known Drufuca scaling method, which it is an empirical one. To improve the physical basis of the method a DSD model is introduced and the α and k coefficients of the rain attenuation are computed. The scaled results are compared with the real rain attenuations at the frequencies of interest (18.7, 39.6 and 49.5 GHz) obtained from the biennial data-set (1995-1996). Data come from a beacon link between the Earth station located in Spino D’Adda (45.4°N, 9.5 °E, altitude 84 m a.m.s.l.) and the geostationary satellite ITALSAT. The scaled results are compared following the error figure presented in ITU-R P.311-18 and the evaluation is made computing the covariance and the mean value of the error between the scaled data and the real data in ccdf form. Results indicate that the physically based frequency scal- ing approach offers improved results.
In questa tesi è presentato un modello di " frequency scaling" basato su un approccio fisico dalla banda Ka alle bande EHF. La scalatura ottenuta è comparata con il ben noto metodo empirico di Drufuca, il quale è un metodo empirico. Per migliorare la base fisica della scalatura è introdotto un modello di DSD per ottenere i coefficienti α e k presenti nella formulazione dell’attenuazione da pioggia. I risultati della scalatura sono comparati con la attenuazione da pioggia reale alle frequenze di interesse (18.7, 39.6 e 49.5 GHz), ottenute da un dataset biennale (1995-1996). Il dataset proviene dal collegamento tra il beacon presente nella stazione di terra di Spino D’Adda (45.4°N, 9.5 °E, altitude 84 m a.m.s.l.) ed il satellite geostazionari ITALSAT. I risultati ottenuti sono comparati seguendo la "figura d’errore" presentata nella ITU-R P.311-18, la valutazione è compiuta tra i dati scalati e reali in forma ccdf. I risultati ottenuti con il metodo implementato nella tesi offrono dei risultati migliori.
Development and test of models to scale rain attenuation from Ka to EHF bands
Allievi, Davide
2021/2022
Abstract
This thesis presents a frequency scaling model based on a physical approach from Ka to EHF bands. The scaling is compared with the well known Drufuca scaling method, which it is an empirical one. To improve the physical basis of the method a DSD model is introduced and the α and k coefficients of the rain attenuation are computed. The scaled results are compared with the real rain attenuations at the frequencies of interest (18.7, 39.6 and 49.5 GHz) obtained from the biennial data-set (1995-1996). Data come from a beacon link between the Earth station located in Spino D’Adda (45.4°N, 9.5 °E, altitude 84 m a.m.s.l.) and the geostationary satellite ITALSAT. The scaled results are compared following the error figure presented in ITU-R P.311-18 and the evaluation is made computing the covariance and the mean value of the error between the scaled data and the real data in ccdf form. Results indicate that the physically based frequency scal- ing approach offers improved results.File | Dimensione | Formato | |
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Development and test of models to scale rain attenuation from Ka to EHF bands.pdf
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Executive_Summary__Development and test of models to scale rain attenuation from Ka to EHF bands.pdf
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https://hdl.handle.net/10589/211802