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Measurement-based underwater acoustic physical layer simulation 基于测量的水声物理层模拟
OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664378
B. Borowski, D. Duchamp
{"title":"Measurement-based underwater acoustic physical layer simulation","authors":"B. Borowski, D. Duchamp","doi":"10.1109/OCEANS.2010.5664378","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664378","url":null,"abstract":"Simulation is important in the study of underwater networking because of the difficulty and expense of performing experiments. Underwater acoustic propagation is influenced by a wide variety of environmental factors, rendering analytic models complex, inaccurate, or both. Therefore, simulations based on models are of uncertain utility. In contrast, this simulator uses measured impulse response, CTD, noise, and transmission loss data in an effort to more realistically simulate the channel. The application layer generates data packets whose modulated waveforms are “mixed” with the channel's properties and sent to a receiver implemented fully in software, where the simulated bit error rate (BER) is measured. For a shallow time-invariant test channel, this process results in a simulated BER that is, on average, within 3.34% of the true BER.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114928189","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: 20
Limits to the predictability of tidal current energy 对潮汐能量可预测性的限制
OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664588
B. Polagye, J. Epler, J. Thomson
{"title":"Limits to the predictability of tidal current energy","authors":"B. Polagye, J. Epler, J. Thomson","doi":"10.1109/OCEANS.2010.5664588","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664588","url":null,"abstract":"The predictability of tidal currents in the context of hydrokinetic power generation are assessed using current data from a series of surveys in Admiralty Inlet, Puget Sound, Washington, USA. Both current speed and kinetic power density are shown to be well-described by harmonic analysis. Three challenges to predictability are identified. First, non-sinusoidal fluctuations over time scales on the order of hours are observed but cannot be replicated by conventional harmonic analysis. Second, turbulent fluctuations over time scales on the order of seconds are relatively large and inherently unpredictable. Third, for this site, predictions may not be extrapolated more than 100 m from the location of measurement. While none of these issues are insurmountable, they contribute to a degree of unpredictability for tidal hydrokinetic power.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133681548","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: 44
Feature-oriented acoustic tomography of a coastal thermal front 海岸热锋特征导向声波层析成像
OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664528
J. Hermand, O. Carrière, Y. Stéphan
{"title":"Feature-oriented acoustic tomography of a coastal thermal front","authors":"J. Hermand, O. Carrière, Y. Stéphan","doi":"10.1109/OCEANS.2010.5664528","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664528","url":null,"abstract":"The continuous monitoring of coastal processes presents a great interest both from the environmental and economic viewpoints. Passive acoustic tomography can be a good candidate to provide synoptic measurements over wide areas while a range-dependent inversion scheme allows to achieve a reasonable spatial resolution along each vertical slice section. This work develops a feature-oriented parameterization scheme for acoustic tomography purposes, enabling the tracking of the main structure of a thermal front. A Kalman algorithm filters sequentially acoustic data recorded on a vertical array, in a frequency regime corresponding to a useful part of ship noise spectrum.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127181221","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: 0
Effective noise correlation matrix structure for equalization of shallow water channels 用于浅水航道均衡的有效噪声相关矩阵结构
OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5663851
B. Blair, J. Preisig
{"title":"Effective noise correlation matrix structure for equalization of shallow water channels","authors":"B. Blair, J. Preisig","doi":"10.1109/OCEANS.2010.5663851","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5663851","url":null,"abstract":"Shallow water acoustic communication is challenging due to the delay and Doppler spread resulting from acoustic scattering from surface gravity waves. A channel estimate based decision feedback equalizer (CEB-DFE) has been shown to be very effective at mitigating these channel effects. One component of the DFE that is often overlooked is the effective noise correlation matrix. In much of the literature, the effective noise correlation matrix is approximated by a scaled identity matrix, where the scaling is assumed to be near the reciprocal of the signal to noise ratio (SNR). For the underwater channel, explicitly estimating the full effective noise correlation matrix leads to a reduction of the residual data estimation error. In this paper we show that correlated changes in channel impulse response coefficients cause the effective noise correlation matrix to have off-diagonal terms. Since the correlated changes tend to occur slowly over time, the effective noise correlation matrix is Toeplitz. An algorithm which exploits this fact to reduce computational complexity is presented and is demonstrated using experimental data.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130748794","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: 0
Standard-target calibration of an acoustic backscatter system 声学后向散射系统的标准目标标定
OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664362
K. Foote, M. Martini
{"title":"Standard-target calibration of an acoustic backscatter system","authors":"K. Foote, M. Martini","doi":"10.1109/OCEANS.2010.5664362","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664362","url":null,"abstract":"The standard-target method used to calibrate scientific echo sounders and other scientific sonars by a single, solid elastic sphere is being adapted to acoustic backscatter (ABS) systems. Its first application, to the AQUAscat 1000, is described. The on-axis sensitivity and directional properties of transducer beams at three operating frequencies, nominally 1, 2.5, and 4 MHz, have been determined using a 10-mm-diameter sphere of tungsten carbide with 6% cobalt binder. Preliminary results are reported for the 1-MHz transducer. Their application to measurements of suspended sediment made in situ with the same device is described. This will enable the data to be expressed directly in physical units of volume backscattering.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130771055","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: 9
Design and development of a Giga-bit Ethernet based high speed broadband data acquisition system for an underwater imaging array 基于千兆以太网的水下成像阵列高速宽带数据采集系统的设计与开发
OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664104
K. Subash, R. Amogh, P. Venugopalan
{"title":"Design and development of a Giga-bit Ethernet based high speed broadband data acquisition system for an underwater imaging array","authors":"K. Subash, R. Amogh, P. Venugopalan","doi":"10.1109/OCEANS.2010.5664104","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664104","url":null,"abstract":"Ambient Noise Imaging (ANI) has been an active area of research at the Acoustic Research Laboratory (ARL). The ARL under Tropical Marine Science Institute (TMSI) of National University of Singapore (NUS) had designed an ambient noise imaging array in 2003 and tested them in the field. To cater for a high data-rate of 1.6 Gbps, Fibre Channel Arbitrated Loop technology was employed. Although this arrangement satisfied the data-rate requirement, the resulting complexity, size, and huge power requirements of the system along with a lack of reliability still needed to be addressed. The recent availability of relatively low cost, small form-factor, multi-channel off the shelf data acquisition cards and low power PC104+ embedded platforms along with Giga-bit Ethernet technology has been used to address the limitations of earlier system. The use of embedded Linux operating system has helped in improving the reliable operation of the system. In this paper we give a detailed account of the new hardware & software design and implementation followed a performance assessment of the system through evaluation in the field.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131403425","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: 5
Hydrological and physical characterization of Cinque Terre Marine Protected Area (Ligurian Sea) and evaluation of current velocity and direction by AUV navigation tracks 五渔村海洋保护区(利古里亚海)水文物理特征及AUV航迹对水流速度和方向的评价
OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664052
M. Locritani, O. Chiappini, R. Chiarabini, F. Bruni, V. Ciccarelli, L. Natale, R. De Paulis
{"title":"Hydrological and physical characterization of Cinque Terre Marine Protected Area (Ligurian Sea) and evaluation of current velocity and direction by AUV navigation tracks","authors":"M. Locritani, O. Chiappini, R. Chiarabini, F. Bruni, V. Ciccarelli, L. Natale, R. De Paulis","doi":"10.1109/OCEANS.2010.5664052","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664052","url":null,"abstract":"The integrated study, concerning the experimental observations, was performed during the oceanographic cruises on-board the two NURC research vessels, in the period between 2008 and 2010 in the Marine Protected Area of Cinque Terre (North-West Mediterranean Sea, Italy). The aim of the research is to describe the environmental features using both hydrological parameters and AUV navigation tracks, acquired respectively by a multi-parametric platform (MEDUSA) and AUV MUSCLE. The innovative contribution of this work is the possibility to evaluate the bottom stream without direct current measurements, but using the navigation data recorded by AUV. This work is a complementary analysis to environmental support of the ENI S.p.A. Exploration and Production Division project.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"52 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133036563","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: 1
An integrated application for geostatistical analysis of sea outfall discharges based on R software 基于R软件的海口排放地统计分析集成应用
OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664282
N. Abreu, P. Ramos
{"title":"An integrated application for geostatistical analysis of sea outfall discharges based on R software","authors":"N. Abreu, P. Ramos","doi":"10.1109/OCEANS.2010.5664282","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664282","url":null,"abstract":"This paper describes an integrated application that performs a geostatistical analysis of data acquired by an AUV in monitoring missions to sewage outfalls. This comes as an effort for automating the procedures of a monitoring campaign from data acquisition to data processing. This application is based on the R statistical software and uses the Gstat package for the geostatistical prediction. R is a console based application that uses software packages developed by the community. The application interfaces with R guiding the user through several steps that perform the geostatistical analysis. It was not our intention to cover all geostatistical procedures but only the ones that are needed for the data processing concerned. The major advantage of this application is that the user does not need to be familiar with methods and data structures associated with the base software, allowing the processing and analysis to be more simple, fast and efficient which is particularly important for routine monitoring. This software application also enables us to give a quicker response in case of contamination to near-by beaches.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133038313","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: 5
Mola Mola, NIUST's low-altitude photo and multibeam AUV Mola Mola, NIUST的低空照片和多波束AUV
OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664411
M. Woolsey, A. Diercks, V. Asper
{"title":"Mola Mola, NIUST's low-altitude photo and multibeam AUV","authors":"M. Woolsey, A. Diercks, V. Asper","doi":"10.1109/OCEANS.2010.5664411","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664411","url":null,"abstract":"Mola Mola is a seafloor mapping AUV owned and operated by the National Institute for Undersea Science and Technology (NIUST). Its primary sensor is a downward-facing camera producing color-corrected seafloor imagery which, with proper navigation and post processing, can be converted to a photo mosaic. It also uses a multibeam sonar to gather bathymetry encompassing the photo coverage. Since its delivery in May of 2009 Mola Mola has been modified in the areas of its imaging and navigation systems as well as several mechanical systems.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131824325","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: 2
Determining anchoring systems for ocean energy harvesting devices off the coast of southeast Florida 确定佛罗里达东南海岸海洋能量收集装置的锚定系统
OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664615
M. Seibert, James H. VanZwieten, K. V. von Ellenrieder
{"title":"Determining anchoring systems for ocean energy harvesting devices off the coast of southeast Florida","authors":"M. Seibert, James H. VanZwieten, K. V. von Ellenrieder","doi":"10.1109/OCEANS.2010.5664615","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664615","url":null,"abstract":"Confirmed ocean current and thermal resources off the coast of south east Florida have the potential to mitigate Florida's increasing energy needs with the deployment of marine renewable energy (MRE) technologies. Potential anchors have been selected in this work for use in mooring MRE systems in specific energy dense locations. Simulations of single point moored hydrokinetic turbines were created to extract anchor loading data for prototype to commercial sized systems enduring hurricane conditions. A basis for the environmental conditions occurring during storms with 100-year return periods was created for this location with the combination of offshore standards in the Gulf of Mexico and local maximum current measurements. High uplift angles and large vertical anchor loads of the taut moorings used in simulation create a difficult anchoring scenario in a location assumed to have stratified seafloors. As MRE systems move from prototype to commercial systems, increased drag due to increasing turbine rotor diameters create anchor loads that require anchor embedment or multiple anchor systems.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124338322","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: 1
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