Attenuation model for free space optics using latency measurements
This study proposes a prediction model for the calculation of rain attenuation for optical wavelengths. Based on latency measurements via 850 nm free space optics transceiver, exponential drop size distribution is derived by method of inference from knowledge of attenuation at the highest rain rate....
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my-utm-ep.350492018-09-17T03:47:09Z Attenuation model for free space optics using latency measurements 2006-12 Al Muharrami, Khalid Zayed Mohammad TK Electrical engineering. Electronics Nuclear engineering This study proposes a prediction model for the calculation of rain attenuation for optical wavelengths. Based on latency measurements via 850 nm free space optics transceiver, exponential drop size distribution is derived by method of inference from knowledge of attenuation at the highest rain rate. As an alternative to the inferred exponential distribution, a lognormal drop size distribution that suits the observed measurements is derived from published distribution models. Both distributions are found to be consistent with measured data. Furthermore, a formula relating latency to rain rate is derived by nonlinear regression analysis. The derived formula gives a very good correlation of 0.971 with the measured data. Regression analysis is also performed to attenuation data obtained by graphically converting measured latency data to attenuation. The results are compared to the proposed attenuation model and found to be identical. The attenuation model, using both drop size distributions, is then compared to well established models in the literature and is found to be mathematically consistent and in good agreement with these models and their measured data. While the established models are for rain rates of up to 100 mm/hr, the proposed model with a simpler derived power law is for rain rates up to 250 mm/hr. The power law, ?(R) =1.118R0.614, is derived for economy of calculation and ease of use. 2006-12 Thesis http://eprints.utm.my/id/eprint/35049/ http://eprints.utm.my/id/eprint/35049/1/KhalidZayedMohammadPFKE2006.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering |
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TK Electrical engineering Electronics Nuclear engineering Al Muharrami, Khalid Zayed Mohammad Attenuation model for free space optics using latency measurements |
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This study proposes a prediction model for the calculation of rain attenuation for optical wavelengths. Based on latency measurements via 850 nm free space optics transceiver, exponential drop size distribution is derived by method of inference from knowledge of attenuation at the highest rain rate. As an alternative to the inferred exponential distribution, a lognormal drop size distribution that suits the observed measurements is derived from published distribution models. Both distributions are found to be consistent with measured data. Furthermore, a formula relating latency to rain rate is derived by nonlinear regression analysis. The derived formula gives a very good correlation of 0.971 with the measured data. Regression analysis is also performed to attenuation data obtained by graphically converting measured latency data to attenuation. The results are compared to the proposed attenuation model and found to be identical. The attenuation model, using both drop size distributions, is then compared to well established models in the literature and is found to be mathematically consistent and in good agreement with these models and their measured data. While the established models are for rain rates of up to 100 mm/hr, the proposed model with a simpler derived power law is for rain rates up to 250 mm/hr. The power law, ?(R) =1.118R0.614, is derived for economy of calculation and ease of use. |
format |
Thesis |
qualification_name |
Doctor of Philosophy (PhD.) |
qualification_level |
Doctorate |
author |
Al Muharrami, Khalid Zayed Mohammad |
author_facet |
Al Muharrami, Khalid Zayed Mohammad |
author_sort |
Al Muharrami, Khalid Zayed Mohammad |
title |
Attenuation model for free space optics using latency measurements |
title_short |
Attenuation model for free space optics using latency measurements |
title_full |
Attenuation model for free space optics using latency measurements |
title_fullStr |
Attenuation model for free space optics using latency measurements |
title_full_unstemmed |
Attenuation model for free space optics using latency measurements |
title_sort |
attenuation model for free space optics using latency measurements |
granting_institution |
Universiti Teknologi Malaysia, Faculty of Electrical Engineering |
granting_department |
Faculty of Electrical Engineering |
publishDate |
2006 |
url |
http://eprints.utm.my/id/eprint/35049/1/KhalidZayedMohammadPFKE2006.pdf |
_version_ |
1747816318450532352 |