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Paper Abstract and Keywords
Presentation 2018-05-24 13:55
Recent Increasing Trend in Rain Attenuation Statistics of Ku-Band Satellite Communications Links
Yasuyuki Maekawa (Osaka Electro-Commun. Univ)
Abstract (in Japanese) (See Japanese page) 
(in English) The long-term rain attenuation statistics of cumulative time percentages are obtained from Ku band satellite signal observations conducted at Osaka Electro-Communication University in Neyagawa, Osaka, during the past 30 years from 1988 to 2017. The long-term statistics for the former 18 years up to 2006 are in very good agreement with the recent ITU-R predictions obtained from the 0.01% rainfall rate. However, the statistics for the latter 12 years after 2006 indicate the cumulative time percentages that considerably exceed those of the ITU-R predictions. The increasing rates of the statistics are not simply explained in term of the increase of propagation path lengths associated with the rise of rain height proportional to recent higher ground temperature, but rather related to the increase of equivalent path lengths due to variations of the horizontal reduction factor and vertical adjustment factor in the ITU-R predictions. This suggests that the scales and densities of precipitating clouds along the satellite propagation paths tend to become larger, caused by the recent frequent occurrence of rain attenuation due to tropical-type rainfall such as shower and typhoon in summer time.
Keyword (in Japanese) (See Japanese page) 
(in English) Satellite communications / Rain attenuation / Rainfall rate / Ku-band / Long-term statistics / Equivalent path length / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 52, SAT2018-3, pp. 11-14, May 2018.
Paper # SAT2018-3 
Date of Issue 2018-05-17 (SAT) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee SAT WBS  
Conference Date 2018-05-24 - 2018-05-25 
Place (in Japanese) (See Japanese page) 
Place (in English) Kagoshima University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Coding, Modulation, Signal processing and General 
Paper Information
Registration To SAT 
Conference Code 2018-05-SAT-WBS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Recent Increasing Trend in Rain Attenuation Statistics of Ku-Band Satellite Communications Links 
Sub Title (in English)  
Keyword(1) Satellite communications  
Keyword(2) Rain attenuation  
Keyword(3) Rainfall rate  
Keyword(4) Ku-band  
Keyword(5) Long-term statistics  
Keyword(6) Equivalent path length  
1st Author's Name Yasuyuki Maekawa  
1st Author's Affiliation Osaka Electro-Communication University (Osaka Electro-Commun. Univ)
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Date Time 2018-05-24 13:55:00 
Presentation Time 25 
Registration for SAT 
Paper # IEICE-SAT2018-3 
Volume (vol) IEICE-118 
Number (no) no.52 
Page pp.11-14 
#Pages IEICE-4 
Date of Issue IEICE-SAT-2018-05-17 

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