Europe Oceans 2005最新文献_第6页

Real time sperm whale depth estimation using passive acoustics 实时抹香鲸深度估计使用被动声学

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511698

C. Laplanche, O. Adam, M. Lopatka, J. Motsch

{"title":"Real time sperm whale depth estimation using passive acoustics","authors":"C. Laplanche, O. Adam, M. Lopatka, J. Motsch","doi":"10.1109/OCEANSE.2005.1511698","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1511698","url":null,"abstract":"Sperm whales (Physeter macrocephalus) make series of transient echolocation sounds (clicks), when foraging. Clicks reflect to the sea surface and the seafloor when propagating towards a receiver. The detection of the once reflected surface and seafloor echoes of a click, and the measurement of the delays of both echoes to the direct path transmitted signal, make possible the localization in depth and in range of the sperm whale which emitted the click, by using a single receiver. Repeating this process click after click then leads to the plotting of the whale depth/range variations while diving. The main difficulty when automating this process is usually to correctly identify direct path signals and echoes. The authors compute the a priori probability density functions of both surface/floor echo delays, improving this click echo identification process. The authors then use an adaptive filter, detecting simultaneously direct path signals with surface echoes. A visual estimation of the range of the whale when starting a dive is used to initiate the detection process. The detection of seafloor echoes then leads to the depth/range estimation of the whale while diving. The detection process works fine (84%, considering a 45-minute dive recording) assuming that a single sperm whale is clicking. The localization process works correctly when seafloor echoes are detected. This method is non-invasive, as it uses neither tags nor active acoustics, and easy to set, as requiring a single hydrophone and a CTD meter, and makes possible an unbiased, inexpensive, automated survey of the diving behavior of single sperm whales in a given area.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"77 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132913656","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: 3

Unsupervised registration of textured images: applications to side-scan sonar 纹理图像的无监督配准:侧向扫描声纳的应用

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511786

P. Mignotte, M. Lianantonakis, Y. Pétillot

{"title":"Unsupervised registration of textured images: applications to side-scan sonar","authors":"P. Mignotte, M. Lianantonakis, Y. Pétillot","doi":"10.1109/OCEANSE.2005.1511786","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1511786","url":null,"abstract":"Sonar images are highly textured images and therefore mislead most of the classical registration algorithms. Registration is a critical step for the creation of high-resolution accurate mosaic images of the seafloor required for seabed analysis and classification. In the past concurrent mapping and localisation have successfully been used but the detection and association of landmarks have been proved difficult and been done manually. However, such methods are time consuming and lack robustness. Landmarks are not regularly present in the images and their localisation is prone to errors. As a consequence, global methods using whole images are preferable. These methods were extensively studied in the recent years and successfully applied to multimodal medical image registration. Unfortunately, the similarity metric between images they rely upon cannot cope with highly textured images. To overcome this issue, textural features must be extracted to highlight similar regions of the images. Registration of these feature maps works but remains sensible to the feature selection and their relation from one modality to the other. An alternative approach is proposed in this paper. Mutual information is calculated from all the features and global registration can be achieved directly. Solely an approximation of MI can be obtained but the performance of this algorithm are equivalent to exact approach and robust to feature selection. This method has been successfully applied to textured images (side-scan sonar) but is also applicable to multimodal images such as bathymetric and sonar data.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133614598","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: 8

Remote data access through Ethernet. Virtual instrument for oceanographic instrumentation supervision and analysis 通过以太网进行远程数据访问。海洋仪器监控与分析的虚拟仪器

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511756

A. Lázaro, J. del Río, S. Shariat

引用次数: 0

Simulation of climate significant nonlinear tidal phenomena in the Euro Arctic seas 欧洲北极海域气候显著非线性潮汐现象的模拟

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511748

R. May

{"title":"Simulation of climate significant nonlinear tidal phenomena in the Euro Arctic seas","authors":"R. May","doi":"10.1109/OCEANSE.2005.1511748","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1511748","url":null,"abstract":"A contribution of nonlinear tidal phenomena to formation and long-term variability of climatically significant fields of the Euro Arctic seas (Norwegian, Greenland, Barents, White and Pechora seas) is estimated in our research. Characteristics of residual tidal phenomena are received by numerical simulations: residual tidal level achieves significant values (up to 16 cm) in several regions of Euro Arctic seas (White Sea, areas around Svalbard, Spitsbergen bank, and along the sea side of the Russian Arctic). Maps of residual tidal currents were built: intensive residual currents are observed in the White Sea, Pechora Sea, regions near Svalbard, Spitsbergen bank, and Bear and Hope islands. A possibility for adjunction of long-period tides by energy of main diurnal and semidiurnal tides is reported; amplitudes of nonlinear long-period tidal waves were evaluated. The impact of nonlinear components of motion and continuity equations on formation of different oceanographic phenomena was determined by means of numerical experiments: it was found that convective nonlinearity noticeably contributes into formation of climatically significant nonlinear tidal phenomena (residual tidal level and currents, and low-frequency tidal waves). An example of the White Sea, it was determined that the tidal phenomena play important role in formation of thermohaline structure of tidal sea waters.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124676423","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: 3

In-situ optical fibre sensors for temperature and salinity monitoring 用于温度和盐度监测的原位光纤传感器

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513243

L. Marrec, T. Bourgerette, E. Datin, N. Ferchaud, B. Pucel, L. Quetel, C. Renault, D. Tregoat

引用次数: 13

A new dimensionality reduction method for seabed characterization: supervised Curvilinear Component Analysis 一种新的海底特征降维方法:监督曲线分量分析

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511737

Hicham Lanaaya, Arnaud Martin, D. Aboutajdine, Ali Khenchaf

引用次数: 8

The effect of space-time joint correlation on the underwater acoustic MIMO capacity 空时联合相关对水声MIMO容量的影响

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511750

Dazhi Piao, Biao Jiang, Huabing Yu, Chang-yu Sun, Qihu Li

{"title":"The effect of space-time joint correlation on the underwater acoustic MIMO capacity","authors":"Dazhi Piao, Biao Jiang, Huabing Yu, Chang-yu Sun, Qihu Li","doi":"10.1109/OCEANSE.2005.1511750","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1511750","url":null,"abstract":"The joint effect of space and time correlation on the underwater acoustic Multiple-Input-Multiple-Output (MIMO) channel capacity is studied using the multipath space-time correlation model with a moving transmit array and a stationary receive array. The space-time correlation function of the uniform liner array is generated, which can be expressed as the production of the space correlation function and the time correlation function, so the space-time joint correlated complex Gaussian variates can be generated by firstly generating n/sub T/*n/sub R/ independent random variates with the desired autocorrelation function, and then multiplied by the square root of their cross-correlation matrix. Using Monte Carlo simulations, the effect of space and time correlation on the underwater acoustic MIMO capacity is studied by the parameters of transmitter velocity, array element spacing, and elevation angle spread. It is shown from the simulation results that in the case of a poor scattering environment and not sufficiently large element spacing, when n transmitter elements and n receiver elements are employed, the outage capacity will not increase linearly with the increasing of n, and large capacity gains can only be obtained in a rich scattering environment and with sufficiently large element spacing, and the effect of transmitter velocity on the capacity depends on the block length T, when T/spl Gt/T/sub coh/, capacities with different transmitter velocity will be the same.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129110654","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: 4

The Litto3D project Litto3D项目

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513237

L. Louvart, C. Grateau

{"title":"The Litto3D project","authors":"L. Louvart, C. Grateau","doi":"10.1109/OCEANSE.2005.1513237","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1513237","url":null,"abstract":"In 2003 the French Institut Geographique National (IGN) and Service Hydrographique et Oceanographique de la Marine (SHOM) have been tasked by the Prime Minister to join efforts to produce together a seamless, modern, precise topographic and bathymetric model, including possibly the tides, of the entire French coasts. The area envisaged should extend from the 10 metres contour line inland to the distance of 10 kilometres seaward, or 6 nautical miles from the coastal baselines. This project was created to meet hundred or more requirements expressed by coastal managers concerned by the protection and exploitation of the littoral and by users of geo-referenced data; it should become the core of all future integrated coastal management projects. The preliminary study conducted in the Golfe du Morbihan, Southern Brittany, has already proven that France should be spared the strenuous geodetic problems met elsewhere. Thanks to the Napoleonic tradition of keeping common geodetic references inland and at sea, the historical database \"Histolitt\" could be assembled fairly quickly, leaving in the poorly surveyed areas gaps that could be filled efficiently by modern technologies (laser bathymetry and topography, MBES, RTK, aerial orthophotos, permanent digital tide gauges), allowing metric accuracy on the plane and decimetric precision of heights and depths. A first lidar survey has already been planned in the summer of 2005 in the Golfe du Morbihan to conduct further tests and generate a precise Digital Terrain Model (DTM) at different resolutions (2 /spl times/ 2 m and 4 /spl times/ 4 m). The survey strategy comprises three different approaches, depending on the bathymetric interest, the near shore seabed complexity and the Rapid Environment Assessment military program requirements.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134376221","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: 17

Sea surface slicks characterization in SAR images 海面浮油在SAR图像中的表征

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511797

T. Kanaa, G. Mercier, E. Tonyé

引用次数: 4

Simulation-based ship design 基于仿真的船舶设计

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511693

V. Bertram, G. Thiart

引用次数: 6