| Presentation | 2018-08-09 [Encouragement Talk] Characteristic Variations 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, other than decrease of XPD values. These increase and decrease of the observed XPD are consistently explained assuming both XPD and cross-polar phase 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 almost linearly from nearly vertical to horizontal direction 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 # | SAT2018-29 |
| Date of Issue | 2018-08-02 (SAT) |
| Conference Information | |
| Committee | SAT / RCS |
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| Conference Date | 2018/8/9(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Iwate University |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Wireless Communications, etc. |
| Chair | Hiroyuki Tsuji(NICT) / Tomoaki Otsuki(Keio Univ.) |
| Vice Chair | Hisashi Sujikai(NHK) / Fumihiro Yamashita(NTT) / Eisuke Fukuda(Fujitsu Labs.) / Satoshi Suyama(NTT DoCoMo) / Fumiaki Maehara(Waseda Univ.) |
| Secretary | Hisashi Sujikai(NTT) / Fumihiro Yamashita(NICT) / Eisuke Fukuda(Hokkaido Univ.) / Satoshi Suyama(NTT) / Fumiaki Maehara |
| Assistant | / Kazushi Muraoka(NTT DOCOMO) / Shinsuke Ibi(Osaka Univ.) / Hiroshi Nishimoto(Mitsubishi Electric) / Koichi Adachi(Univ. of Electro-Comm.) / Osamu Nakamura(Sharp) |
| Paper Information | |
| Registration To | Technical Committee on Satellite Telecommunications / Technical Committee on Radio Communication Systems |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | [Encouragement Talk] Characteristic Variations 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-Commun. Univ.) |
| Date | 2018-08-09 |
| Paper # | SAT2018-29 |
| Volume (vol) | vol.118 |
| Number (no) | SAT-176 |
| Page | pp.pp.7-10(SAT), |
| #Pages | 4 |
| Date of Issue | 2018-08-02 (SAT) |