OCEANS 2008最新文献

{"title":"Study on wireless data transmission of an autonomous water vehicle for ocean observation","authors":"W. Gu, Jianhua Wang, Jianxin Chu, Xixia Huang","doi":"10.1109/OCEANS.2008.5151840","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5151840","url":null,"abstract":"In this paper, a wireless data transmission system used in unmanned surface vehicles is presented. To improve reliability, wireless local network based on IP is employed. Through interface protocol, multi-modal data from different observation instruments or equipments are converted into the uniform specification suitable for transmission. Different control methods of data transmission are discussed. Experiment results from a unmanned surface vehicle sailing in the Yangtze River estuary show that the wireless data transmission system is suitable for applicable use.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133094457","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":"OpenCV based computer vision of deep-sea visual exploration system","authors":"Liu Jing-biao, Cai Wen-yu","doi":"10.1109/OCEANS.2008.5151842","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5151842","url":null,"abstract":"Deep-sea visual exploration system plays an important role in the area of deep-sea expedition. Because of the harsh ocean environment, the deep-sea visual exploration system may face many problems such as high press of deep sea, instantaneous impact, deep-sea surge, local high temperature etc. Therefore, most current deep-sea visual exploration systems are not practicable. In this paper, considering the strongpoint of MPEG-4 coding and decoding technology with G.SHDSL modulation and demodulation technology, we designed a deep-sea visual exploration device based on 10000 m coaxial cable and MPEG-4 video server. Moreover, as a step up, computer vision based on OpenCV development kit has been introduced in this deep-sea visual exploration device. As a scientific discipline, computer vision is concerned with the theory for building artificial systems that obtain information from images, on the other hand, computer vision technology studies and describes artificial vision system that is implemented in software and/or hardware. With computer vision technology, deep-sea visual exploration system can obtain better performance and is intelligent enough to deal with some simply instance. As a consequence, the proposed deep-sea visual exploration device has been working on the ship named as ocean-one for many years, and has obtained many wonderful deep-sea video material, as a result, has made important contributions to ocean investigation enterprise of China.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134311709","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":"Analytical techniques for the calculation of leeway as a basis for search and rescue planning","authors":"J. Morris, V. Osychny, A. Turner","doi":"10.1109/OCEANS.2008.5152022","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5152022","url":null,"abstract":"Leeway, defined as the movement of the search object through water caused by the action of wind on the exposed surfaces of the object, is fundamental to search planning. Over the past several years, the U.S. Coast Guard (USCG) Research and Development Center (R&DC) and the Canadian Coast Guard (CCG) have participated in leeway studies of various drift targets such as life rafts, evacuation vessels, sailboats, and other targets of interest. The leeway coefficients computed for each drift target generated from these leeway studies will be used in the new USCG Search and Rescue (SAR) planning software, the Search and Rescue Optimal Planning System (SAROPS), to define potential search areas during SAR operations. In the fall of 2005, the R&DC conducted leeway testing of two specific drift objects on behalf of the U.S. Naval Submarine Medical Research Laboratory: the Mark-10 Submarine Escape and Immersion Equipment (SEIE) life raft, and the Submarine Emergency Position Indicating Radio Beacon (SEPIRB). These studies were performed off the coast of St. John's, Newfoundland, Canada where open ocean conditions can be obtained within several miles from shore. Multiple drift runs were completed for each type of object to evaluate their behavior in response to various wind and sea conditions, producing object drift data under a wide variety of conditions. During the course of the study, each target was tracked by an on-board GPS receiver and data logger to yield high-resolution speed and direction over ground data. Wind velocity and sea conditions were measured by meteorological and wave rider buoys deployed within the study area to characterize environmental forcing conditions. The leeway of one SEIE raft was measured directly by a 1200 kHz acoustic Doppler current profiler (ADCP) gimbal-mounted and in a down-looking orientation, as well as multiple Self Locating Datum Marker Buoys (SLDMBs) that reported their respective positions via satellite at 30-minute intervals. Leeway of the remaining objects was determined indirectly by subtracting the surface current vector of adjacent SLDMBs from the drift object vector motion recorded by its onboard GPS receiver. Because all search objects were in the vicinity of the SLDMB field, a comparison between the direct and indirect leeway motion could be made for the ADCP-equipped SEIE raft. This value was then correlated to recorded wind speed and direction, and subjected to error analysis and statistical validation. This paper focuses on the methodology employed during the field study and provides a detailed description of the post-processing routines used to derive leeway coefficients for the SEIE for U.S. Navy search planning, and for use by the USCG in its SAROPS planning software. Estimates of the surface current for each drift target to support indirect leeway calculations relied on a statistical interpolation technique and consisted of steps described in the paper below. The resulting time series constituted a d","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133840478","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":"A wedge diffraction based scattering model for acoustic scattering from rough littoral seafloors","authors":"R. Keiffer, R. Zingarelli","doi":"10.1109/OCEANS.2008.5152131","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5152131","url":null,"abstract":"Models for acoustic scattering from rough surfaces based on Biot and Tolstoy's (BT) exact wedge diffraction theory have proven accurate and useful in a number of experimental and numerical studies [1]. Because the BT solution is restricted to impenetrable wedges (acoustically hard or soft boundary conditions), scattering models based on the BT solution have thus far been limited to the rough air/sea interface where the actual boundary conditions are very nearly pressure-release (soft). Recently, important theoretical work [2,3] has extended the exact BT theory to density-contrast but isospeed wedges. This new development makes possible the application of wedge diffraction based scattering models to the roughness at the sea floor where the change in the acoustic impedance at the boundary is dominated by changes in density and only weakly affected by changes in sound speed. However, it is important to confirm that small amounts of sound speed contrast do not perturb the diffraction too much. To contribute to the understanding of how the diffracted wave is affected by sound speed contrast and get some idea as to the practical limitations of wedge-diffraction based scattering models for littoral seafloors, a simple numerical experiment involving a highly accurate Finite-Difference Time-Domain (FDTD) solution to the acoustic wave equation and a wedge-shaped boundary has been explored. This paper presents the results of FDTD experiments designed to quantify any changes in the diffracted field brought about by sound speed contrast. An ad hoc treatment of sound speed contrast is developed based on the requirement that the diffracted wave must smooth out the reflection discontinuity and preserve the continuity of the total field.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115710388","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":"Shallow water height mapping with interferometric synthetic aperture sonar","authors":"S. Silva, S. Cunha, A. Matos, N. Cruz","doi":"10.1109/OCEANS.2008.5151972","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5151972","url":null,"abstract":"Height mapping of shallow water areas is an important task for many commercial and scientific applications like river navigability, infrastructure maintenance or natural resource monitoring. The use of an autonomous boat presents several advantages that ease the use of synthetic aperture images to create three-dimensional topographic maps through interferometric techniques. Sample data obtained during test trials illustrate how synthetic aperture can be used to generate imagery and bathymetry data.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116707236","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":"DSAAV - A distributed software architecture for autonomous vehicles","authors":"M. Chitre","doi":"10.1109/OCEANS.2008.5151848","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5151848","url":null,"abstract":"Autonomous Underwater Vehicle (AUV) technology has matured over the past few decades but commercial AUVs today remain complex, proprietary and expensive. Modularity in AUVs at a software, electronics and mechanical level allows users to configure AUVs for specific missions by only including the required components. With multiple base AUVs, users may easily configure heterogeneous teams of AUVs for collaborative missions. Modular AUVs are also easier to maintain. We expect that open-architecture AUVs with open software/hardware interfaces, changeable modules and open source components will become widely available in the future. However AUV configuration management and module compatibility are issues that arise with modularity. An initiative at the Acoustic Research Laboratory (ARL) of the National University of Singapore (NUS) has yielded an open- architecture collaborative prototype AUV known as STARFISH. The software components in this AUV are based on the DSAAV architecture. DSAAV has been designed ground up with modular AUVs in mind. In a DSAAV compliant AUV, each module provides a uniform software interface that other AUV modules can access. This interface allows configuration of the module, logging of critical information, discovery of services, access to sensor & actuator services, health monitoring and automated software update functionality. The interface is rich in functionality, yet light weight and portable to ensure that even low power micro-controllers can easily implement it. DSAAV can be implemented on any underlying communication backbone such as Ethernet, UDP/IP, etc. The software components running under DSAAV are independent of the underlying communication backbone and function without change in various AUVs and simulation environments. In this paper, we describe the basic philosophy and concepts behind DSAAV. We also outline the Application Programming Interface (API) for DSAAV compliant systems and describe its key functionality. It is our hope that DSAAV will be adopted and extended by other AUVs in the future.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117055062","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":"A 20 KW open ocean current test turbine","authors":"F. Driscoll, G. Alsenas, P. Beaujean, S. Ravenna, J. Raveling, E. Busold, C. Slezycki","doi":"10.1109/OCEANS.2008.5152104","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5152104","url":null,"abstract":"Florida is faced with an energy crisis with respect to capacity, supply, cost, emissions, and stability. The untapped energetic waters of the Florida Current could provide a clean, reliable, base-load local renewable energy source for Florida. To facilitate the successful commercial harvesting of this hydrokinetic resource, Florida Atlantic University's Center for Ocean Energy Technology is designing, fabricating, deploying, and operating an experimental small-scale turbine. This 20 kW Ocean Current Turbine Testbed (OCTT) is an open-blade axial-flow horizontal underwater turbine driven by a 3 m diameter 3-blade rotor. It is intended to operate in the open ocean near the core of the Florida Current, offshore Ft. Lauderdale, for long periods of time. This turbine is not intended to be a scaled prototype of a commercial model, but it is intended to be an experimental system to assess technology, identify gaps, investigate and collect data about potential environmental impacts, and provide a foundation for commercial and policy development.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124961003","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":"Interpolation methods for vertical linear array element localization","authors":"T. K. Chandrayadula, K. Wage","doi":"10.1109/OCEANS.2008.5151910","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5151910","url":null,"abstract":"Array element localization is crucial for applications such as ocean acoustic tomography. Loss of navigation data makes it difficult to compensate for array motion when implementing operations such as mode filtering or beamforming. This paper presents a method for estimating missing array navigation data using an empirical orthogonal function (EOF) model. The method can be applied to estimate the location of some vertical array elements based on the location of the other elements. It assumes that second order statistics can be estimated from a set of navigation measurements for the full array. The paper applies the EOF-based method to estimate missing navigation data for the long range ocean acoustic propagation experiment (LOAPEX). The results are evaluated by examining how the errors in mooring motion estimation affect mode processing. In particular the paper analyzes the degradation in array gain and the errors in time of arrival for the low order modes. The error statistics indicate that use of the EOF method has a negligible effect on mode processing.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124267414","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":"The international Arctic buoy programme (IABP): A cornerstone of the Arctic observing network","authors":"I. Rigor, P. Clemente-Colon, E. Hudson","doi":"10.1109/OCEANS.2008.5152136","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5152136","url":null,"abstract":"The Arctic has undergone dramatic changes in weather, climate and environment. It should be noted that many of these changes were first observed and studied using data from the IABP (http://iabp.apl.washington.edu). For example, IABP data were fundamental to Walsh et al. (1996) showing that atmospheric pressure has decreased (Figure 1), Rigor et al. (2000) showing that air temperatures have increased (Figure 2), and to Proshutinsky and Johnson (1997); Steele and Boyd, (1998); Kwok, (2000); and Rigor et al. (2002) showing that the clockwise circulation of sea ice and the ocean has weakened (Figure 1). All these results relied heavily on IABP data.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126227539","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":"Large-area visual mapping of an underwater vent field using the AUV “Tri-Dog 1”","authors":"T. Maki, H. Kondo, T. Ura, T. Sakamaki","doi":"10.1109/OCEANS.2008.5152049","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5152049","url":null,"abstract":"In August 2007, the Autonomous Underwater Vehicle (AUV) Tri-Dog 1 succeeded in visually mapping the seafloor of Tagiri underwater vent field, Kagoshima Bay in Japan to create a large photomosaic with an area of around 3,000 square meters. This is one of the largest underwater photomosaic ever reported. The photomosaic revealed distribution of detailed features of the field such as tube-worm colonies, bacteria mats and bubble plumes. This paper describes the autonomous navigation method implemented on the vehicle and then reports the experimental results.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125789278","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}