| Presentation | 2017-07-27 Estimation of Cross-Polarization Discrimination Degradation of Ka-band Satellite Communication Signals due to Lightning Discharges Yasuyuki Maekawa, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Increase and decrease of rapid changes in cross-polarization discrimination (XPD) of Ka-band satellite radio wave caused by thunderstorm events are investigated using the beacon signal (19.45GHz, right-hand circular polarization) of CS-3 and N-Star observed at 1 or 0.1 sec intervals in Osaka Electro-Communication University, Neyagawa, Osaka, from 1990 to 2006. A considerable amount of rapid changes in XPD shows increase of XPD values, meaning decrease of depolarization, although the previous C-band low elevation angle observations conducted by the international satellite communications links primarily showed decrease of XPD values. This tendency is consistently explained examining the increase and decrease of the observed XPD and cross-polar phases, under the assumption of appropriate XPD and cross-polar phases due to the alignment and mean canting angles of ice crystals at the discharging point. Also, the XPD values and cross-polar phases are directly traced during the rapid changes at the discharging point using those measured at 0.1 sec interval. It is found that the XPD values due to the alignment of ice crystals disappear in about 0.5 sec, while the mean canting angles of ice crystals move from nearly vertical around 90°to horizontal around 0°in this short period. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Satellite communications / Ka-band / Cross-polarization discrimination / Cross-polar phase / Lightning discharge / Rapid changes / Ice crystals / Canting angles |
| Paper # | AP2017-53,SAT2017-9 |
| Date of Issue | 2017-07-19 (AP), 2017-07-20 (SAT) |
| Conference Information | |
| Committee | AP / SAT / SANE |
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| Conference Date | 2017/7/26(3days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Nagoya Institute of Technology |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Remote sensing, Radio propagation, Antennas and Propagation, Sattelite Communication |
| Chair | Jiro Hirokawa(Tokyo Tech.) / Toshinori Susuki(Tohoku Gakuin Univ.) / Sonosuke Fukushima(ENRI) |
| Vice Chair | Ryo Yamaguchi(SoftBank) / Hiroyuki Tsuji(NICT) / Fumihiro Yamashita(NTT) / Toshifumi Moriyama(Nagasaki Univ.) / Akitsugu Nadai(NICT) |
| Secretary | Ryo Yamaguchi(NTT DoCoMo) / Hiroyuki Tsuji(Saitama Univ.) / Fumihiro Yamashita(KDDI Research) / Toshifumi Moriyama(NICT) / Akitsugu Nadai(Mitsubishi Electric) |
| Assistant | Nobuyasu Takemura(Nippon Inst. of Tech.) / Satoshi Yamaguchi(Mitsubishi Electric) / / Manabu Akita(Univ. of Electro-Comm.) / Ryo Natsuaki(Univ. of Tokyo) |
| Paper Information | |
| Registration To | Technical Committee on Antennas and Propagation / Technical Committee on Satellite Telecommunications / Technical Committee on Space, Aeronautical and Navigational Electronics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Estimation of Cross-Polarization Discrimination Degradation of Ka-band Satellite Communication Signals due to Lightning Discharges |
| Sub Title (in English) | |
| Keyword(1) | Satellite communications |
| Keyword(2) | Ka-band |
| Keyword(3) | Cross-polarization discrimination |
| Keyword(4) | Cross-polar phase |
| Keyword(5) | Lightning discharge |
| Keyword(6) | Rapid changes |
| Keyword(7) | Ice crystals |
| Keyword(8) | Canting angles |
| 1st Author's Name | Yasuyuki Maekawa |
| 1st Author's Affiliation | Osaka Electro-Communication University(Osaka Electro-Comm. Univ.) |
| Date | 2017-07-27 |
| Paper # | AP2017-53,SAT2017-9 |
| Volume (vol) | vol.117 |
| Number (no) | AP-150,SAT-152 |
| Page | pp.pp.47-50(AP), pp.19-22(SAT), |
| #Pages | 4 |
| Date of Issue | 2017-07-19 (AP), 2017-07-20 (SAT) |