| 講演要旨(和文) | | AUVを用いた高精度磁気探査を実現するためには，ビークルが持つ永久磁化と誘導磁化の影響の補正に加え，ビークルの姿勢変化の影響を補正する必要がある．本研究では，種子島沖泥火山周辺で実施したAUV「うらしま」による磁気探査で取得した磁場3成分データの解析により，ビークル姿勢変化の影響について検討を行った．各潜航では，8の字潜航データによる補正が不十分であり，姿勢の変化（特に，ピッチ角の変化）が，得られた磁気異常に大きく影響した．そこで，補正係数の算出に各測線間の変針点のデータも組み合わせることで，ビークル磁化の影響をより効果的に補正できた．さらに，得られた磁気異常プロファイルとピッチ角変化との相関をとることでピッチ変化の影響を補正し，より精度の高い磁気異常プロファイルを得ることができた． |
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| | 講演要旨(英文) | | Correction for the effect of vehicle attitude change is essential for the detailed AUV magnetic survey in addition to the correction of the vehicle's permanent and induced magnetic field. In this study, we have investigated the effect of vehicle attitude change using the vector magnetic data collected by AUV "URASHIMA" of JAMSTEC during the survey of mud volcanoes off Tanegashima. We confirmed the vehicle attitude change, especially the pitch change, strongly affects the calculated magnetic anomaly. Then, we attempted to use the magnetic data measured during the vehicle's turns between survey lines for the better estimation of the constants related to the vehicle's permanent and induced magnetic field. In order to derive the real magnetic anomaly, we also applied the method to estimate the pitch effect on the magnetic data by using correlation coefficient between the magnetic anomaly and the pitch change. |
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