2026-03-12T20:10:02Z https://jcga.repo.nii.ac.jp/oai

oai:jcga.repo.nii.ac.jp:00000039 2023-10-04T00:15:54Z 1:9:14

自給気潜水装置を装着したダイバーから発生する水中呼吸音とイメージングソーナー映像 The Underwater Respiratory Sound and the Forward Looking Sonar Images Generated from the Diver Equipped with the Self-Contained Underwater Breathing Apparatus 倉本, 和興 クラモト, カズオキ KURAMOTO, Kazuoki forward looking sonar underwater search and rescue SCUBA underwater respiratory sound When we support the underwater search and rescue activity of Japan Coast Guard (JCG) divers from behind a surface ship by utilizing the Forward Looking Sonar (FLS), strong interference lines from the sonar head toward the divers occasionally appear on the sonar image in response to the breathing of divers. It is considered that a high-frequency component is included in the underwater respiratory sound of divers and is overlapped with the carrier signal from the sonar projector and has been observed all together by the receiver consequently. In this study, we measured the underwater respiratory sound when the diver uses the self-contained underwater breathing apparatus (SCUBA) in the pool or in the real sea and examined what kind of frequency elements were included in this respiratory sound. Furthermore, we discussed the mechanism how the strong interference line comes into the sonar image and considered a method of utilization and possibility to the field services of JCG. 海上保安大学校 2021-03-25 jpn departmental bulletin paper VoR https://doi.org/10.15053/0000000039 https://jcga.repo.nii.ac.jp/records/39 10.15053/0000000039 10.15053/2020.21.01 AN10088865 0287-2951 海上保安大学校研究報告, 理工学系 Report]of Japan Coast Guard Academy Part 2 (The Science and Engineering Section) 63 1-2 1 6 https://jcga.repo.nii.ac.jp/record/39/files/2_63-1-85-01_Kuramoto.pdf application/pdf 2.2 MB 2023-03-17