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GAPS, combined USBL + INS + GPS tracking system for fast deployable & high accuracy multiple target positioning GAPS，结合USBL + INS + GPS跟踪系统，用于快速部署和高精度多目标定位
Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513270
F. Napolitano, F. Cretollier, H. Pelletier
{"title":"GAPS, combined USBL + INS + GPS tracking system for fast deployable & high accuracy multiple target positioning","authors":"F. Napolitano, F. Cretollier, H. Pelletier","doi":"10.1109/OCEANSE.2005.1513270","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1513270","url":null,"abstract":"The common threat among MCM operations and concept is the need for a clear and concise battle space picture enabling the on-scene commander to maneuver naval forces from the sea into the littorals. The timely collection of data (REA) and accurate positioning of subsea targets must be possible anywhere in the world, in a potentially rapid approaching and hostile environment, in coastal regions where access is often limited. EXPLORA 05 is a live REA demonstration organised by the French Navy in Morgat bay (close to Brest, France) using subsea remote instrumentation. The iXSea GAPS (Global Acoustic Positioning System) has been used for tracking of several vehicles. In this paper we present it and demonstrate its attractive features for MCM/REA applications including fast deployable, high accuracy, plug and play and easy to use multiple targets positioning system. We also discuss several future new concepts and solutions for subsea positioning iXSea in currently developing, and how they contribute to solve positioning issues on the subsea battlefield.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"30 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":"129695026","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: 16
On the analysis of buried objects by processing 3-D acoustic images 三维声图像处理对地埋物的分析
Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511740
M. Palmese, A. Caiti, A. Trucco
{"title":"On the analysis of buried objects by processing 3-D acoustic images","authors":"M. Palmese, A. Caiti, A. Trucco","doi":"10.1109/OCEANSE.2005.1511740","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1511740","url":null,"abstract":"Investigation of man-made objects relying on the seafloor or embedded into the bottom can be carried out by acoustic imaging techniques and subsequent data processing. In this paper, a processing chain that, starting from a 3-D acoustic image of the object to be examined and requiring a minimal interaction with the user, results in an augmented reality model is described. Essentially, the chain includes blocks devoted to noise reduction, statistical 3-D segmentation, semi-automatic surface fitting, extraction of measurements, and virtual reality modeling.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"10 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":"130365496","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
Characterisation of improved polyester fibres for offshore mooring lines 近海系泊缆绳用改良聚酯纤维的特性
Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513245
C. Lechat, A. Piant, A. Bunsell, P. Davies, B. Forest
{"title":"Characterisation of improved polyester fibres for offshore mooring lines","authors":"C. Lechat, A. Piant, A. Bunsell, P. Davies, B. Forest","doi":"10.1109/OCEANSE.2005.1513245","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1513245","url":null,"abstract":"This paper describes tests performed to evaluate the properties of improved polyester fibres for marine rope applications. First the static and cyclic properties of single fibres have been measured. Then yarn and rope yarn specimens have been tested. Finally, sub-rope samples of 36 ton break load have been characterized. The data collected are now being used to validate rope performance analyses.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"87 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":"129875225","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
Multibeam sub-bottom profiler: exploitation of experimental data 多波束海底剖面仪:实验数据的开发
Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511800
A. Pacault, G. Theuillon, J. Le Gac, X. Lurton, B. Langli
{"title":"Multibeam sub-bottom profiler: exploitation of experimental data","authors":"A. Pacault, G. Theuillon, J. Le Gac, X. Lurton, B. Langli","doi":"10.1109/OCEANSE.2005.1511800","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1511800","url":null,"abstract":"The use of a SBP 120 multibeam sub-bottom profiler (Kongsberg Maritime) during recent sea trials enabled us to acquire data in various sedimentary areas and to test the influence of different acquisition parameters. In the first section of this article, we describe the SBP 120 main features. Studying the oblique beams, we then show that the recorded signal mainly comes from coherent reflection. The use of large arrays provides a high source level and increases the directivity index at emission and reception, but we show that to image complex structures, it can be interesting to limit the arrays' length and to use a less directive device. In the last section, we show preliminary results of the exploitation of SBP 120 data to characterize the geological environment.","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":"129276299","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
Maximum likelihood estimates of a spread-spectrum source position using a tetrahedral ultra-short baseline array 使用四面体超短基线阵列的扩频源位置的最大似然估计
Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511699
P. Beaujean, A. I. Mohamed, R. Warin
{"title":"Maximum likelihood estimates of a spread-spectrum source position using a tetrahedral ultra-short baseline array","authors":"P. Beaujean, A. I. Mohamed, R. Warin","doi":"10.1109/OCEANSE.2005.1511699","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1511699","url":null,"abstract":"An ultra-short baseline acoustic positioning system has been made compatible with the FAU Dual Purpose Acoustic Modem network to provide azimuth and elevation of modem-type sources. The acoustic antenna is composed of four transducers arranged as a tetrahedron. The position estimation is performed using the detection sequence of each message transmitted by the modem source. This spread-spectrum detection sequence is a series of frequency-hopped pulses. The estimation technique is based on the maximum-likelihood estimation technique originally described by Quazi and Lerro. A simulation has been implemented and experiments have been performed in a calibration tank specifically built for this purpose. Model and experiments confirm that the accuracy of this system improves with the number of pulses and the signal-to-noise ratio, and that a high positioning accuracy can be achieved using the proposed method. This work is sponsored in part by the Office of Naval Research, Code # ONR 321OM, Dr. Tom Swean.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"62 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":"130464267","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
Gabor atomic decomposition of Green's functions for geoacoustic inversion and segmentation of a shallow water environment 浅水环境地球声反演与分割的Gabor原子分解格林函数
Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513241
P. Oonincx, J. Hermand
{"title":"Gabor atomic decomposition of Green's functions for geoacoustic inversion and segmentation of a shallow water environment","authors":"P. Oonincx, J. Hermand","doi":"10.1109/OCEANSE.2005.1513241","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1513241","url":null,"abstract":"This paper introduces a method that identifies acoustic transmission data with feature vectors for the segmentation of range-dependent shallow water areas. The measurement geometry consists of sonobuoy-like receivers drifting away from a fixed sound source. The data consist of the medium impulse response measured repeatedly along each buoy track (frequency-dependent Green's function). The feature vector entries are parameters obtained from a sparse, tree-based, matching pursuit decomposition of each response into Gabor atoms. The mutual distance of neighbor feature vectors is used to detect and localise main variations of the bottom geoacoustic properties and eventually isolate subareas of moderate variability. The method is tested with data from experiments of rapid environmental assessment (REA) ENVERSE 97-98.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"232 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":"131117137","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
All Electric Ship electromagnetic signature. A twenty megawatts podded ship 全电动船电磁信号。一艘20兆瓦的吊舱船
Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511713
B. Lucas, H. Henocq, Trokourey Albert
{"title":"All Electric Ship electromagnetic signature. A twenty megawatts podded ship","authors":"B. Lucas, H. Henocq, Trokourey Albert","doi":"10.1109/OCEANSE.2005.1511713","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1511713","url":null,"abstract":"Today, many ships, cruise liners and Navy vessels, use an electric podded propulsion. These \"All Electric Ships\" (AES) need an important electric power. Consequently, high currents in extremely low frequencies (ELFE), flow through cables and equipment. These alternative currents could generate important underwater electromagnetic field. We have to quantify the level of this field and its impact on the signature of this kind of ship. Then, GESMA carried out electromagnetic measurements using a multisensors underwater and autonomous facility named AMI. It was placed on the route of a few megawatts podded ship, at one hundred meters depth from the surface. We observed a non negligible radiated electric field.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"7 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":"125009562","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
Experimental study and numerical modelling of a cod-end 冷端实验研究与数值模拟
Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511677
D. Priour, G. Germain
{"title":"Experimental study and numerical modelling of a cod-end","authors":"D. Priour, G. Germain","doi":"10.1109/OCEANSE.2005.1511677","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1511677","url":null,"abstract":"The selectivity of trawls is conditioned by the net structure and flow characteristics which substantially affect the fish behaviour and the catch geometry in the cod-end. With the aim of a better understanding of interaction in presence in these flexible structures, we first carried out an experimental study to determine and to analyse the flow over a cod-end. In a second part, we describe a Finite Element Method modelling devoted to flexible structures made of nets, cables and bars, such as trawls.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"3 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113967422","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
Spatial resolution enhancement of microwave scanning radiometer data 微波扫描辐射计数据的空间分辨率增强
Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511793
M. Migliaccio, A. Gambardella, D. Theis
{"title":"Spatial resolution enhancement of microwave scanning radiometer data","authors":"M. Migliaccio, A. Gambardella, D. Theis","doi":"10.1109/OCEANSE.2005.1511793","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1511793","url":null,"abstract":"In this paper we present a new numerical procedure to enhance the spatial resolution of microwave radiometers. The approach is physically based on the occurrence of multiple partially correlated measurements in the microwave scanning radiometers. Mathematically the approach is equivalent to a linear inversion problem and its solution is pursued by means of two numerical methods both based on the singular value decomposition (SVD). A set of numerical examples illustrates the first results of the study in which reference test-cases have been considered.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"13 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":"114333654","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
Measurement of deepwater ocean waves from a subsurface mooring 从地下系泊处测量深海海浪
Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511703
J. Wood, E. Terray, B. Strong, B. Singh
{"title":"Measurement of deepwater ocean waves from a subsurface mooring","authors":"J. Wood, E. Terray, B. Strong, B. Singh","doi":"10.1109/OCEANSE.2005.1511703","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1511703","url":null,"abstract":"We measured wave height and directional spectra in the open ocean from a subsurface mooring in 1400 meters water depth. Six months of data were recovered successfully at a site south of Australia where high-energy waves (with periods greater than 10 seconds) dominated the spectrum. Nondirectional wave height spectra were estimated from measurements of velocities made with an upward-looking ADCP mounted at the top of the mooring. Additional estimates of the nondirectional spectrum were obtained from a pressure sensor inside the ADCP, and from echo-location of the surface derived from the acoustic backscatter intensities measured by the ADCP. Mooring motion was removed using measurements from a second downward-looking ADCP mounted on the bottom of the float. Wave direction was determined from the velocities measured by the upward-looking ADCP using a variant of single point UVW processing, which permitted heading variations to be compensated continuously. We verified that the resulting horizontal and vertical velocities within the frequency bands containing appreciable wave energy are in quadrature, and that their coherence is close to unity. This paper describes the technique and assesses the quality of the resulting wave spectra and moments.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"37 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114085958","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
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