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- 저자 : Sawa Takao (검색결과 3 건)
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Study on Improvement in Resolution of Synthetic Aperture Sonar Using Spatial Filter
Kazuya Watanabe,Satoshi Honda,Takao Sawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A synthetic aperture sonar(SAS) achieving high azimuth resolution at long range has been studied for seafloor mapping. Images obtained from SAS, however, are not sufficient to acquire detailed information of seabed. Hence, in order to obtain the sharp image of the object, it is necessary to improve the resolution of the images. Beam forming techniques steer direction with the greatest sensitivity. We propose an application of beam forming to SAS for the accuracy improvement of imagery. Computer simulation and real data analysis show that an improvement of azimuth resolution is achieved and the reare differences between simulation rsults and real data results.
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Kasaya, Takafumi,Kanamatsu, Toshiya,Sawa, Takao,Kinosita, Masataka,Tukioka, Satoshi,Yamamoto, Fujio Korean Society of Earth and Exploration Geophysici 2011 지구물리와 물리탐사 Vol.14 No.1
Autonomous underwater vehicles (AUVs) present the important advantage of being able to approach the seafloor more closely than surface vessel surveys can. To collect bathymetric data, bottom material information, and sub-surface images, multibeam echosounder, sidescan sonar (SSS) and subbottom profiler (SBP) equipment mounted on an AUV are powerful tools. The 3000m class AUV URASHIMA was developed by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC). After finishing the engineering development and examination phase of a fuel-cell system used for the vehicle's power supply system, a renovated lithium-ion battery power system was installed in URASHIMA. The AUV was redeployed from its prior engineering tasks to scientific use. Various scientific instruments were loaded on the vehicle, and experimental dives for science-oriented missions conducted from 2006. During the experimental cruise of 2007, high-resolution acoustic images were obtained by SSS and SBP on the URASHIMA around the northern Kumano Basin off Japan's Kii Peninsula. The map of backscatter intensity data revealed many debris objects, and SBP images revealed the subsurface structure around the north-eastern end of our study area. These features suggest a structure related to the formation of the latest submarine fan. However, a strong reflection layer exists below ~20 ms below the seafloor in the south-western area, which we interpret as a denudation feature, now covered with younger surface sediments. We continue to improve the vehicle's performance, and expect that many fruitful results will be obtained using URASHIMA.
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심해 자율무인잠수정 우라시마의 잠항시험에서 취득된 북 구마노 분지 해저 선상지 시스템의 음향 영상
( Takafumi Kasaya ),( Toshiya Kanamatsu ),( Takao Sawa ),( Masataka Kinosita ),( Satoshi Tukioka ),( Fujio Yamamoto ) 한국지구물리·물리탐사학회 2011 지구물리와 물리탐사 Vol.14 No.1
Autonomous underwater vehicles (AUVs) present the important advantage of being able to approach the seafloor more closely than surface vessel surveys can. To collect bathymetric data, bottom material information, and sub-surface images, multibeam echosounder, sidescan sonar (SSS) and subbottom profiler (SBP) equipment mounted on an AUV are powerful tools. The 3000 m class AUV URASHIMA was developed by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC). After finishing the engineering development and examination phase of a fuel-cell system used for the vehicle`s power supply system, a renovated lithium-ion battery power system was installed in URASHIMA. The AUV was redeployed from its prior engineering tasks to scientific use. Various scientific instruments were loaded on the vehicle, and experimental dives for science-oriented missions conducted from 2006. During the experimental cruise of 2007, high-resolution acoustic images were obtained by SSS and SBP on the URASHIMA around the northern Kumano Basin off Japan`s Kii Peninsula. The map of backscatter intensity data revealed many debris objects, and SBP images revealed the subsurface structure around the north-eastern end of our study area. These features suggest a structure related to the formation of the latest submarine fan. However, a strong reflection layer exists below ~20ms below the seafloor in the south-western area, which we interpret as a denudation feature, now covered with younger surface sediments. We continue to improve the vehicle`s performance, and expect that many fruitful results will be obtained using URASHIMA.
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