2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies最新文献_第3页

Adaptive SONAR sounds by echolocating bats 回声定位蝙蝠的自适应声纳声音

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370829

T. Hagino, S. Hiryu, S. Fujioka, H. Riquimaroux, Y. Watanabe

{"title":"Adaptive SONAR sounds by echolocating bats","authors":"T. Hagino, S. Hiryu, S. Fujioka, H. Riquimaroux, Y. Watanabe","doi":"10.1109/UT.2007.370829","DOIUrl":"https://doi.org/10.1109/UT.2007.370829","url":null,"abstract":"Like dolphins, bats are known to possess highly developed SONAR systems in air. Echolocating bats can be divided into two groups: the CF-FM and FM bats depending on frequency structure of their pulses. In this study, we used one of Japanese FM bat species, Pipistrellus abramus. The echolocation behavior was examined for two different flight tasks: (a) field recording while capturing insects in the open area, and (b) recording for a landing approach to a target wall in the laboratory. We acoustically compared these two echolocations by the bats while approaching a target. In the field and laboratory, repetition rates of pulse emission in the search phase were constant at approximately 10 pulses/s. When approach phase was started, the bats increased the repetition rate of the pulse emission to 140-190 pulses/s. We found that the pulse duration was dynamically decreased from 10 to 0.5 ms during prey capturing in the field, whereas it ranged from 0.5 to 3-4 ms in the laboratory. A CF-like portion (a narrow slope portion at the end of pulse) was observed to follow the initial FM sweep beyond approximately 2 m of the target distance in the laboratory. Interestingly, the CF-like portion was found to be extended by the bats in the field and such long pulse duration was never seen in the laboratory. This suggests that FM bats use not only broadband signals, but also narrowband signals for echolocation in the far target range as CF-FM bat species. Biosonar animals might have been supposed to adapt their echolocation to underlying physical law in nature or their environment through their evolutionary history. These comparative studies between the field and laboratory recordings are expected to help our understanding of bat's biosonar system, and various echolocation strategies employed by the bats will contribute to develop artificial SONAR system or new echo-sensing devices in the future.","PeriodicalId":345403,"journal":{"name":"2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131270976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Development of glider type small AUV SeaBird 滑翔机型小型AUV海鸟的研制

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370797

S. Araki, K. Ishii

引用次数: 10

Shoreline Survey Method using Amphibious Walking Robot and the Navigation Method Regarding Amphibious Traveling 水陆行走机器人岸线测量方法及水陆行走导航方法

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370793

T. Tanaka, T. Shiraishi, T. Hirabayashi

引用次数: 3

Offshore Tsunami Observation by the Kuril Islands Earthquake of 15 November 2006 千岛群岛2006年11月15日地震的近海海啸观测

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370767

H. Matsumoto, K. Kawaguchi, K. Asakawa

引用次数: 0

In situ measurement of time-series two dimensional O2 distributions at sediment-water interface using a planar O2 optode system connected with a submarine cable 利用与海底电缆连接的平面O2光电系统原位测量沉积物-水界面时间序列二维O2分布

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370814

K. Oguri, H. Kitazato, R. Glud, H. Stahl, F. Wenzhofer, K. Asakawa, R. Iwase, S. Sakai, H. Nomaki, K. Fujikura

引用次数: 3

Evolution and Future of Multibeam Echosounder Technology 多波束测深技术的发展与未来

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370844

B. Volberg, T. Meurling

引用次数: 3

Motion Planning for Small Formations of Autonomous Vehicles Navigating on Gradient Fields 梯度场小编队自动驾驶车辆运动规划

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370775

S. Kalantar, U. Zimmer

引用次数: 12

A New Low Cost Ocean Bottom Cabled Seismometers 一种新型低成本海底电缆地震仪

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370813

T. Kanazawa, M. Shinohara, S. Sakai, O. Sano, H. Utada, H. Shiobara, Y. Morita, T. Yamada, K. Yamazaki

引用次数: 12

Real-Time 3D Sonar Image Recognition for Underwater Vehicles 水下航行器实时三维声纳图像识别

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370843

Son-cheol Yu, Tae-Won Kim, G. Marani, Song K. Choi

引用次数: 22

Acoustic Counting Method of Upstream Juvenile Ayu Plecoglossus altivelis by Using DIDSON 基于DIDSON的上游阿玉舌鱼幼鱼声学计数方法

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370752

Han Jun, A. Asada

{"title":"Acoustic Counting Method of Upstream Juvenile Ayu Plecoglossus altivelis by Using DIDSON","authors":"Han Jun, A. Asada","doi":"10.1109/UT.2007.370752","DOIUrl":"https://doi.org/10.1109/UT.2007.370752","url":null,"abstract":"Plecoglossus altivelis, often called ayu in Japan, is one of the important inland aquatic resources. Ayu is a typical amphidromous fish migrating between coastal waters and rivers. In order to assess the abundance of ayu, the direct visual count has mainly been taken so far. Unfortunately, this kind of counting method is not only labor-intensive, but also is affected by weather conditions and turbidity. Recently, an ultrasonic instrument called DIDSON (Dual-frequency IDcntification SONar), which can provide almost-video-quality images to identify objects even in turbid water, has been found applicable for fish counting. This instrument is useful for counting big fish which is several dozen centimeters large. However, as for the small fish whose length is only 8 centimeters or less, the counting becomes technically difficult because its echo image is too weak and too unstable to identify fish from images and to track it. In this paper we present a method for counting juvenile small size ayu that migrates upriver using a DIDSON. We first subtract the stationary background from the acoustic image and remove noises. Then we track the remaining targets. After the removal of the garbage going downstream, we reached the correct counting of the upstream fishes. The above acoustic method for counting young small size ayu has been proven to be useful and effective by the experiment conducted on May 31st, 2006.","PeriodicalId":345403,"journal":{"name":"2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131714159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6