過去の学会誌一覧

Vol.31 No.1 通巻113号 (2004年/平成16年)

追悼文 笹島孝夫会長の御急逝を悼む 大谷隆彦 15(15)
あいさつ 会長挨拶及び抱負 古澤昌彦 16(16)
法人化検討状況報告 海洋音響学会の法人化について 鎌田弘志 17(17)
研究 海底地形情報の誤差補正手法とデータ管理に関する研究
A Study of error correction method and data management for bottom topographic data.
Masao SAKATA, Akira ASADA (Institute of Industrial Science, University of Tokyo)

The bathymetry data obtained by multi-beam echo sounder is widely used and the amount is getting larger these days. But most of the existing systems to manage those data are made for common usage.
So these systems cannot efficiently meet the demands varying by users who need more detailed bathymetry map for example. In this paper, first we suggest new data management system which improve these points. Next, two kinds of methods to correct errors of the bathymetry data are shown as functional components of new data management system. One is ray tracing in Earth ellipsoid and another is correction of error caused by horizontal acceleration in motion sensor. It was proved that the result of the new calculation method in ray tracing revises 5m of depth errors at a depth of about 5000m. And the error correction of the motion sensor after depth sounding was proved effective but needs more investigation.
坂田雅雄,浅田昭 20 (20)
マルチビーム測深データの動揺補正とノイズ除去に関する研究
Time rigid motion compensation and noise reduction of multi-beam bathymetry data (shallow sea).
Toshihiro MAKI, Akira ASADA (Institute of Industrial Science, University of Tokyo)

Noises of multi-beam echo sounding cause wrong bathymetry data. In this paper we discuss two improved methods of data processing to reduce noises.
(1) Time rigid motion compensation Ship motion (rolling, pitching, heaving) affects the location of each footprint. We improved the timing of ship motion used in compensation. We applied new method to real data, and we managed to get more precise bathymetry data than the old one.
(2) Noise filtering using 3D angle of incidence There is a strong relationship between echo intensity and angle of incidence. Usually, 2D angle of incidence on a plane of projected fan beam is used for noise filtering. However, 2D angle of incidence isn’t correct if the bottom is a slope. We introduced new method to calculate 3D angle of incidence, and applied it to real data.
巻 俊宏,浅田昭 28(28)
2003-1 Open Forum Abstracts Acoustics, Ocean Observatories, and the Future. Bruce M.Howe 39 (39)
レポート World Congress on Ultrasonics 2003報告 土屋健仲 52 (52)
随想 学会発足前の思い出 小山孝哉  55 (55)
目次目録 57 (57)
会記事 60 (60)
投稿規定 63 (63)