| 講演名 | 2023-12-08 Multiple Scattering Effect Analysis of Circularly Polarized Radar for Volcanic Lava Observation 吉本 有輝(住友金属鉱山/千葉大), 内藤 大志(住友金属鉱山), ヨサファット テトォコ スリ スマンティヨ(千葉大/セベラスマレット大), |
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| 抄録(和) | Estimation of eruption size is important for mitigation of eruption hazards, and for this purpose, it is necessary to clarify the dominant factors of eruption style and its transition process from the viewpoint of chemical reaction, but there are still many unknowns, such as the correspondence with thermal history. To solve this problem, we are developing a microwave observation system suitable for in situ observation of volcanic products including lava in a high-temperature closed environment. When observing the volcanic crater, multiple scattering waves from other objects appear due to the influence of rock walls, etc., and these waves interfere with the acquisition of dielectric permittivity information of the object. In this study, we investigate the effect of multiple scattering by a simple cylindrical wall that simulates a crater or fumarole, and the scattering characteristics of circularly polarized waves in a lava layer by electromagnetic field analysis. The results show that in a smooth and uniform dielectric layer simulating a lava layer, the co-polarization component tends to have a scattering distribution with weak backscattering and large side lobes, regardless of the relative permittivity. Analysis of the polarization dependence of the received power of the scattered wave in a system in which a cylindrical wall surface is introduced shows that the cross-polarization received wave can reduce the effect of multiple scattering from the wall surface. This result is presumably due to the circular polarization dependence of the scattering intensity distribution of the smooth dielectric layer. |
| 抄録(英) | Estimation of eruption size is important for mitigation of eruption hazards, and for this purpose, it is necessary to clarify the dominant factors of eruption style and its transition process from the viewpoint of chemical reaction, but there are still many unknowns, such as the correspondence with thermal history. To solve this problem, we are developing a microwave observation system suitable for in situ observation of volcanic products including lava in a high-temperature closed environment. When observing the volcanic crater, multiple scattering waves from other objects appear due to the influence of rock walls, etc., and these waves interfere with the acquisition of dielectric permittivity information of the object. In this study, we investigate the effect of multiple scattering by a simple cylindrical wall that simulates a crater or fumarole, and the scattering characteristics of circularly polarized waves in a lava layer by electromagnetic field analysis. The results show that in a smooth and uniform dielectric layer simulating a lava layer, the co-polarization component tends to have a scattering distribution with weak backscattering and large side lobes, regardless of the relative permittivity. Analysis of the polarization dependence of the received power of the scattered wave in a system in which a cylindrical wall surface is introduced shows that the cross-polarization received wave can reduce the effect of multiple scattering from the wall surface. This result is presumably due to the circular polarization dependence of the scattering intensity distribution of the smooth dielectric layer. |
| キーワード(和) | Volcanic lava monitoring / Microwave scattering / Circularly polarization / Electromagnetic field analysis |
| キーワード(英) | Volcanic lava monitoring / Microwave scattering / Circularly polarization / Electromagnetic field analysis |
| 資料番号 | SANE2023-80 |
| 発行日 | 2023-11-30 (SANE) |
| 研究会情報 | |
| 研究会 | SANE |
|---|---|
| 開催期間 | 2023/12/7(から3日開催) |
| 開催地（和） | インドネシア ジャワ県ソロ市 |
| 開催地（英） | Surakarta, Indonesia |
| テーマ（和） | ICSANE |
| テーマ（英） | ICSANE |
| 委員長氏名（和） | 若山 俊夫(三菱電機) |
| 委員長氏名（英） | Toshio Wakayama(Mitsubishi Electric) |
| 副委員長氏名（和） | 網嶋 武(明大) / 毛塚 敦(電子航法研) |
| 副委員長氏名（英） | Takeshi Amishima(Meiji Univ.) / Atsushi Kezuka(ENRI) |
| 幹事氏名（和） | 北村 尭之(三菱電機) / 尚 方(電通大) |
| 幹事氏名（英） | Takayuki Kitamura(Mitsubishi Electric) / Shang Fang(Univ. of Electro-Comm) |
| 幹事補佐氏名（和） | 長縄 潤一(電子航法研) / 赤嶺 賢彦(防衛省) |
| 幹事補佐氏名（英） | Junichi Naganawa(ENRI) / Yoshihiko Akamine(TRDI) |
| 講演論文情報詳細 | |
| 申込み研究会 | Technical Committee on Space, Aeronautical and Navigational Electronics |
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| 本文の言語 | ENG |
| タイトル（和） | |
| サブタイトル（和） | |
| タイトル（英） | Multiple Scattering Effect Analysis of Circularly Polarized Radar for Volcanic Lava Observation |
| サブタイトル（和） | |
| キーワード(1)（和/英） | Volcanic lava monitoring / Volcanic lava monitoring |
| キーワード(2)（和/英） | Microwave scattering / Microwave scattering |
| キーワード(3)（和/英） | Circularly polarization / Circularly polarization |
| キーワード(4)（和/英） | Electromagnetic field analysis / Electromagnetic field analysis |
| 第 1 著者 氏名（和/英） | 吉本 有輝 / Yuki Yoshimoto |
| 第 1 著者 所属（和/英） | 住友金属鉱山株式会社/千葉大学(略称：住友金属鉱山/千葉大) Sumitomo Metal Mining Co., Ltd./Chiba University(略称：SMM/Chiba Univ.) |
| 第 2 著者 氏名（和/英） | 内藤 大志 / Motoyuki Naito |
| 第 2 著者 所属（和/英） | 住友金属鉱山株式会社(略称：住友金属鉱山) Sumitomo Metal Mining Co., Ltd.(略称：SMM) |
| 第 3 著者 氏名（和/英） | ヨサファット テトォコ スリ スマンティヨ / Josaphat Tetuko Sri Sumantyo |
| 第 3 著者 所属（和/英） | 千葉大学/セベラスマレット大学(略称：千葉大/セベラスマレット大) Chiba University/Sebelas Maret University(略称：Chiba Univ./UNS) |
| 発表年月日 | 2023-12-08 |
| 資料番号 | SANE2023-80 |
| 巻番号（vol） | vol.123 |
| 号番号（no） | SANE-298 |
| ページ範囲 | pp.110-115(SANE), |
| ページ数 | 6 |
| 発行日 | 2023-11-30 (SANE) |