| Presentation | 2018-05-24 Recent Increasing Trend in Rain Attenuation Statistics of Ku-Band Satellite Communications Links Yasuyuki Maekawa, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(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) |
| Keyword(in English) | Satellite communications / Rain attenuation / Rainfall rate / Ku-band / Long-term statistics / Equivalent path length |
| Paper # | SAT2018-3 |
| Date of Issue | 2018-05-17 (SAT) |
| Conference Information | |
| Committee | SAT / WBS |
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| Conference Date | 2018/5/24(2days) |
| 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 |
| Chair | Toshinori Susuki(Tohoku Gakuin Univ.) / Fumiaki Maehara(Waseda Univ.) |
| Vice Chair | Hiroyuki Tsuji(NICT) / Fumihiro Yamashita(NTT) / Masanori Hamamura(Kochi Univ. of Tech.) / Fumie Ono(NICT) |
| Secretary | Hiroyuki Tsuji(KDDI R&D Labs.) / Fumihiro Yamashita(NICT) / Masanori Hamamura(Mitsubishi Electric) / Fumie Ono(Ibaraki Univ.) |
| Assistant | / Akira Nakamura(Tokyo Univ. of Science) / Ryohei Nakamura(National Defense Academy) |
| Paper Information | |
| Registration To | Technical Committee on Satellite Telecommunications / Technical Committee on Wideband System |
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| Language | JPN |
| 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) |
| Date | 2018-05-24 |
| Paper # | SAT2018-3 |
| Volume (vol) | vol.118 |
| Number (no) | SAT-52 |
| Page | pp.pp.11-14(SAT), |
| #Pages | 4 |
| Date of Issue | 2018-05-17 (SAT) |