OCEANS 2007最新文献

{"title":"A Summary of Existing and Future Potential Treatments for Reducing Underwater Sounds from Oil and Gas Industry Activities","authors":"J. Spence","doi":"10.1109/OCEANS.2007.4449420","DOIUrl":"https://doi.org/10.1109/OCEANS.2007.4449420","url":null,"abstract":"This paper summarizes the efforts undertaken by the author to identify existing and future potential methods to reduce underwater sound levels created by nearly all oil and gas industry related activities, including sources associated with seismic exploration, construction, transport, drilling, and production. Information was collected from various sources including technical and trade journal articles, contacts with representatives of companies that make or own noise control products and technologies, contacts with members of academia, and data provided directly by members of the International Association of Oil and Gas Producers (OGP). A workshop was held on June 4-5, 2007 to discuss initial findings and further develop ideas for feasible sound reduction approaches and future methods. This effort was supported and financed by the by the Joint Industry Programme on E&P Sound and Marine Life (www.soundandmarinelife.org).","PeriodicalId":214543,"journal":{"name":"OCEANS 2007","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121693792","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}

{"title":"Underwater Wideband Source Localization Using the Interference Pattern Matching","authors":"Seung-Yong Chun, Se-Young Kim, Ki-Man Kim","doi":"10.1007/978-3-540-77090-9_47","DOIUrl":"https://doi.org/10.1007/978-3-540-77090-9_47","url":null,"abstract":"","PeriodicalId":214543,"journal":{"name":"OCEANS 2007","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121055267","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}

{"title":"Real time path-planning of an AUV based on characteristics of passive acoustic landmarks for visual mapping of shallow vent fields","authors":"T. Maki, Hayato Mizushimat, H. Kondo, T. Ura, T. Sakamaki, Masao Yanagisawat","doi":"10.1109/OCEANS.2007.4449321","DOIUrl":"https://doi.org/10.1109/OCEANS.2007.4449321","url":null,"abstract":"Although underwater vent fields are of great scientific interest, accurate visual mapping is difficult because of the presence of bubble plumes that degrade the accuracy of conventional acoustic positioning systems such as long base line (LBL) and super short base line (SSBL). The authors had proposed a visual mapping method of shallow vent fields with an autonomous underwater vehicle (AUV) equipped with a profiling sonar, where positioning is based on vertical rod-shaped acoustic reflectors and bubble plumes. Although performance was verified through a series of experiments, there remain two challenges as follows. Firstly, observation is terminated if the vehicle was surrounded by bubble plumes, since the vehicle tries to avoid collision with not only artificial reflectors but also collision-safe bubble plumes. Secondly, the observation area drifts by disturbance since the waypoints are defined relative to the vehicle's position after descending close to seafloor. This paper proposes a real-time path planning method of an AUV as a part of the proposed observation method. The path of the vehicle is defined based on the types of landmarks as well as the geometric relationship between the vehicle and the landmarks. The vehicle can distinguish landmark types using a sheet laser and a camera. The proposed method was implemented on the AUV Tri-Dog 1 and a series of experiments were carried out in order to verify its performance.","PeriodicalId":214543,"journal":{"name":"OCEANS 2007","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129274881","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}

{"title":"Data Analysis of a Low-Cost Bathymetry System Using Fishing Echo Sounders","authors":"K. Hatanaka, M. Toda, M. Wada","doi":"10.1109/OCEANS.2007.4449181","DOIUrl":"https://doi.org/10.1109/OCEANS.2007.4449181","url":null,"abstract":"The multi-beam echo sounder system with an accurate GPS can provide a detailed view of the seafloor and is successfully utilized in oceanography but its expense makes it impractical for many uses. The authors have therefore presented a low-cost system for surveying shallow sea bottom topography by using a fishing echo sounder in such a way that the many areas of the industry in which the information of the sea depth is required can easily use it to get the information they need. The system is based on sensor network technology, namely Micro Cube, which allows for the collection of the data from the fishing echo sounder via the Internet. However, the data obtained by the present system include noises or errors due to the reflection from bubbles or fishnets. In this paper, data analyses to erase noises or errors from measurements in the present system are discussed using the discrete wavelet transform and statistics. Experiments carried out in Rumoi, on the west coast of Hokkaido, Japan from July 2004 to December 2006 are studied for the examinations of data analyses for practical use.","PeriodicalId":214543,"journal":{"name":"OCEANS 2007","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123189835","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}

{"title":"Practical Use of Personal Buoy System for Fishery Using Sensor Network Technologies","authors":"M. Wada, K. Hatanaka, M. Toda","doi":"10.1109/OCEANS.2007.4449169","DOIUrl":"https://doi.org/10.1109/OCEANS.2007.4449169","url":null,"abstract":"This report proposes a new mode for oceanic observations that can be conducted to \"one buoy per fisherman\". In response to requests from the scallop cultivation fishermen, a new personal buoy based on sensor network technologies has been developed at a price of approximately US$ 1,000 each for seawater temperature observations. The network currently being developed for use by individual fishermen will use these relatively inexpensive, personal buoys to record and share information about the ocean water temperatures reported by his buoy with other fishermen. The buoy presented in this report is not only for providing users with an actual visualization of the seawater temperature distribution, but also given the useful information for the prediction against the suddenly change of the seawater temperature to fishermen by sharing the information at numerous locations and multiple layers. Ten buoys have already been installed at locations on the coast of Hokkaido, mainly in scallop cultivation sea areas.","PeriodicalId":214543,"journal":{"name":"OCEANS 2007","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133075616","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}

{"title":"Autonomous recognition of bubble plumes for navigation of underwater robots in active shallow vent areas","authors":"H. Mizushima, T. Maki, T. Ura, T. Sakamaki, H. Kondo, M. Yanagisawa","doi":"10.1109/OCEANS.2007.4449284","DOIUrl":"https://doi.org/10.1109/OCEANS.2007.4449284","url":null,"abstract":"Although underwater vent fields are of great scientific interest, little is understood concerning their influence on the underwater ecosystem due to the great difficulties involved in their underwater survey. The authors propose an underwater survey method using AUVs. In previous works, the authors proposed a practical method to survey the \"Tagiri\" vent area in Kagoshima, in southern Japan [1] [2], and carried out experiments. The field experiments in Tagiri were at some degree successful, but the system also encountered some difficulties. One of the problems was that the AUV could not identify the type of landmarks used to support accurate positioning. In this paper, we propose an autonomous recognition method of bubble plumes using a sheet laser and a camera by image processing. The performance of the proposed method was verified with data obtained in tank experiments, and then implemented in the AUV Tri-Dog 1. Using the proposed method, Tri-Dog 1 performed seafloor observations of the Tagiri vent area in March 2007. Tri-Dog 1 succeeded in distinguishing between bubble plumes and artificial acoustic reflectors, and localizing itself with sufficient accuracy to create a vast, high resolution visual map of the area.","PeriodicalId":214543,"journal":{"name":"OCEANS 2007","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128647967","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}

{"title":"An Efficient Algorithm for the Radar Recognition of Ships on the Sea Surface","authors":"Kun-Chou Lee, Lan-Ting Wang, Jhih-Sian Ou, Chih-Wei Huang","doi":"10.1109/OCEANS.2007.4449263","DOIUrl":"https://doi.org/10.1109/OCEANS.2007.4449263","url":null,"abstract":"In this paper, an efficient algorithm is proposed to the angular-diversity radar recognition of ships with noise effects taken into consideration. The goal is to identify the similarity between the unknown target ship and known ships. The content of this paper is divided into two parts. In the first part, the angular-diversity radar recognition of ships is given by transformation based approaches, i.e., the principal components analysis (PCA), with noise effects taken into consideration. The goal is to identify the similarity between the unknown target ship and known ships. In the second part, the linear discriminant algorithm (LDA) is utilized to increase the recognition rate. Initially, the angular-diversity radar cross sections (RCS) from a ship are collected to constitute RCS vectors (usually large-dimensional). By changing the elevation angle or the ship type, different RCS vectors are obtained to produce a high-rank covariance matrix. By choosing some of the largest eigenvalues and their corresponding eigenvectors, all the RCS vectors are projected onto the eigenspace (usually small-dimensional). Similarity between the unknown target ship and known ships can be identified in the eigenspace with high recognition rate. This will reduce the complexity for radar recognition of RCS characteristics from ships. However, the separating ability for such an elementary recognition is usually poor. This poor separation of radar target recognition will make the prediction results unreliable. The PCA gives the major features for the projected data of the two classes. While the LDA gives the best separation for the projected data of the two classes. To enhance the separating ability of radar target recognition, the projection features on the PCA space are further projected onto the LDA space and the recognition is performed on the LDA space. Our simulation shows that the separating ability for RCS based recognition of targets is greatly increased by using the LDA in the radar recognition process. In addition, the use of LDA in the recognition process increases the ability to tolerate noise effects. This study will be helpful in many applications of radar target recognition.","PeriodicalId":214543,"journal":{"name":"OCEANS 2007","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130943472","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}

{"title":"Properties of HF RADAR Compact Antenna Arrays and Their Effect on the MUSIC Algorithm","authors":"T. de Paolo, T. Cook, E. Terrill","doi":"10.1109/OCEANS.2007.4449265","DOIUrl":"https://doi.org/10.1109/OCEANS.2007.4449265","url":null,"abstract":"Detailed analysis of the compact antenna array patterns and the internal signal processing within the MUSIC algorithm leads to a goodness-of-fit quality metric for the output radial current velocities and bearings produced by the HF RADAR system. To achieve this, some theory behind the MUSIC direction finding algorithm, describing its Direction of Arrival (DO A) metric, is first presented. MATLAB simulations are conducted and statistics are collected on the DOA metrics. The magnitudes of these metrics are directly related to the quality of the bearings produced by the MUSIC algorithm. Quality of measured antenna patterns is paramount to the accuracy of the MUSIC algorithm bearing output. Ambiguities, as well as other aspects of the measured antenna patterns that are detrimental to quality, are discussed. This research provides HF RADAR users with a practical quality metric for the radial current velocities and their associated bearings produced by the HF RADAR system.","PeriodicalId":214543,"journal":{"name":"OCEANS 2007","volume":"190 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124054081","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}

{"title":"Initial Deployments of the Rover, an Autonomous Bottom-Transecting Instrument Platform for Long-Term Measurements in Deep Benthic Environments","authors":"P. McGill, A. Sherman, B. Hobson, R. Henthorn, A. Chase, K. Smith","doi":"10.1109/OCEANS.2007.4449315","DOIUrl":"https://doi.org/10.1109/OCEANS.2007.4449315","url":null,"abstract":"Rover is a bottom-crawling, autonomous vehicle capable of making continuous time-series measurements at abyssal depths up to 6000 m for periods exceeding six months. The Rover control system and instrumentation suite are being designed at the Monterey Bay Aquarium Research Institute (MBARI), building on the earlier rover work of Smith and associates at the Scripps Institution of Oceanography. The vehicle weighs 68 kg in water and crawls on two wide tracks with a combined surface contact area of about one square meter; this provides good traction while minimizing the disturbance to benthic sediments. A typical mission scenario is to take measurements for a few days at each site before picking up the instruments and moving forward ~10 m to a new site. Up to fifty sites may be visited in a single mission. Engineering field tests have been performed with the Rover in the Monterey Bay in California (890 m depth), and at Station M, 220 km west of the central California coast (4200 m depth). Rover operations have been observed with the ROVs Ventana and Tiburon, and with the manned submersible DSV Alvin. Knowledge gained from these engineering deployments has resulted in numerous modifications and improvements to The Rover.","PeriodicalId":214543,"journal":{"name":"OCEANS 2007","volume":"346 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115291025","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}

{"title":"Ocean Outfall Mapping Using an Autonomous Underwater Vehicle","authors":"H. Niu, T. Husain, B. Veitch, N. Bose, S. Adams, M. He, K. Lee","doi":"10.1109/OCEANS.2007.4449238","DOIUrl":"https://doi.org/10.1109/OCEANS.2007.4449238","url":null,"abstract":"Ocean outfalls are difficult to observe and the traditional monitoring methods are expensive and can only provide limited information. As an alternative, Autonomous Underwater Vehicles (AUVs) have proved to be an effective tool for outfall mapping. This paper describes an outfall mapping mission by the MUN Explorer AUV off the east coast of Canada. A submerged freshwater outfall with Rhodamine WT dye was discharged into a bay and the MUN Explorer AUV equipped with a fluorometer was used to measure the dye concentration and the extent of the dispersed plume. The results have shown that the AUV can be effectively used to map the outfall and future work is needed to provide more detailed plume information.","PeriodicalId":214543,"journal":{"name":"OCEANS 2007","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115412193","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}