OCEANS 2010 MTS/IEEE SEATTLE最新文献_第8页

A study on network coding in underwater networks 水下网络中网络编码的研究

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664326

N. Chirdchoo, M. Chitre, Wee-Seng Soh

引用次数: 8

Review of literature and studies on electro magnetic fields (EMF) generated by undersea power cables and associated influence on marine organisms 海底电缆产生的电磁场及其对海洋生物的相关影响的文献和研究综述

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664611

T. Switzer, D. Meggitt

引用次数: 1

Characteristics of underwater ambient noise at a proposed tidal energy site in puget sound 普吉特湾拟建潮汐能场水下环境噪声特征

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664380

Christopher Bassett, Jim Thomson, B. Polagye

{"title":"Characteristics of underwater ambient noise at a proposed tidal energy site in puget sound","authors":"Christopher Bassett, Jim Thomson, B. Polagye","doi":"10.1109/OCEANS.2010.5664380","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664380","url":null,"abstract":"Ambient underwater acoustics data are presented for one year at a potential tidal energy site in Admiralty Inlet, WA (USA) with maximum currents exceeding 3 m/s. The site, at a depth of approximately 60 meters, is located near shipping lanes, a local ferry route, and a transit area for many cetacean species. A key finding is that the statistical distribution of total sound pressure levels are dependent on tidal currents at the site. Pseudosound, cobbles shifting on the sea bed, and vibrations induced by forces on the equipment are possible explanations. Non-propagating turbulent pressure fluctuations, termed pseudosound, can mask ambient noise, especially in highly energetic environments suitable for tidal energy development. A statistical method identifies periods during which changes in the mean and standard deviation of the one-third octave band sound pressure levels are statistically significant and thus suggestive of pseudosound contamination. For each deployment, recordings with depth averaged tidal currents greater than 1 m/s are found to be contaminated, and only recordings with currents below this threshold are used in the subsequent ambient noise analysis. Mean total sound pressure levels (0.156 - 30 kHz) over all recordings are 117 dB re 1μPa. Total sound pressure levels exceed 100 dB re 1μPa 99% of the time and exceed 135 dB re 1μPa 4% of the time. Commercial shipping and ferry traffic are found to be the most significant contributors to ambient noise levels at the site, with secondary contributions from rain, wind, and marine mammal vocalizations. Post-processed data from an AIS (Automatic Identification System) receiver is used to determine the location of ships during each recording. Referencing 368 individual recordings with the distance between the ferry and the site obtained from AIS data, the source level of the ferry is estimated to be 179 ± 4 dB re 1μPa at 1m with a logarithmic spreading loss coefficient of 18.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"7 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":"125839991","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: 24

Projection-based tapering for conventional beamforming on nonlinear sonar arrays 非线性声纳阵列上传统波束形成的基于投影的变细方法

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5663849

R. Otnes, N. Skjei

引用次数: 1

Developing experience and gaining knowledge for Naval Operations in an ice free Arctic Ocean 为海军在无冰北冰洋的行动积累经验和知识

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5663926

S. McLaughlin, M. McCallister, T. Higbee

{"title":"Developing experience and gaining knowledge for Naval Operations in an ice free Arctic Ocean","authors":"S. McLaughlin, M. McCallister, T. Higbee","doi":"10.1109/OCEANS.2010.5663926","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5663926","url":null,"abstract":"Preparing to Introduce U.S. Navy Forces into the Arctic. Scientific data indicate that global climate change is warming the Arctic Ocean Basin at a greater rate than other regions of the Earth. Assuming this pattern continues, within this decade both the northeastern and northwestern passages through the Arctic Basin will be clear for a significant part of the year, and indeed the entire Arctic Ocean may be essentially ice free for several months every year. Arctic nations and some U.S. peer competitors are already demonstrating significant interest in arctic exploration and exploiting the projected vast mineral resources that lie on or under the seafloor in the Arctic basin. A multitude of enabling actions should be completed to ensure that our understanding of the Arctic environment allows the United States Navy to successfully operate in that harsh, remote environment. First, data that were gathered during the Cold War years must be resurrected, geo-located, and analyzed to establish a foundation upon which to build. From those results, new studies can be defined to fill gaps in the available data and to evaluate the changes that are occurring, including the potential impact of human activities. Necessary studies include seafloor mapping, sub-bottom profiling, bathymetric analysis, acoustic performance modeling and basing studies. From those studies, enhanced models can be developed to better predict accelerating environmental changes and guide collection of the data necessary to prepare for deployment of systems necessary for national security. A first use of those data and models should be to plan and install a test surveillance array and to conduct studies to support basing vessels in Northern Alaska or at sea in deeper water. This paper summarizes the types of data that can be expected from an array installation and it describes enabling tasks the must be completed in order to effectively operate in the Arctic.","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":"126767237","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

Marine hydrokinetic turbine technology and the environment: Device-biota interactions 海洋水动力涡轮机技术与环境:设备-生物群相互作用

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664055

Souder Heidi Crevison, Ye Li, R. Thresher

{"title":"Marine hydrokinetic turbine technology and the environment: Device-biota interactions","authors":"Souder Heidi Crevison, Ye Li, R. Thresher","doi":"10.1109/OCEANS.2010.5664055","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664055","url":null,"abstract":"Because marine hydrokinetic (MHK) turbine technologies are still in their infancy, their impacts on the environment remain largely unknown. Although few empirical data exist for MHK technologies, more data are available for other man-made structures. This paper discusses fish, mammal, bird, and benthic organism interactions with MHK devices and other man-made structures that may be analogous to these MHK technologies. In experiments conducted on the Mississippi River Lock and Dam No. 2, the survival of several species of small and large fish that passed through an MHK turbine was 99%. No data on mammal, sea turtle, or bird interactions with MHK turbines were available, but other types of anthropogenic mortality and traumatic injuries to these groups of animals have been well documented. Collisions with ships and fishing gear have greatly impacted most groups of marine mammals. Large whales that inhabit shallow coastal waters and diving birds that use sight to pursue prey underwater are at risk for collision. However, many devices have a positive impact on fish or benthic organism populations because they act as fish aggregation devices or artificial reefs.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"42 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":"121443947","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

Detection and classification of marine mammal clicks 海洋哺乳动物咔哒声的检测与分类

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664576

D. McGaughey, D. Marcotte, M. Korenberg, J. Theriault

引用次数: 5

A high data-rate, software-defined underwater acoustic modem 一个高数据速率，软件定义的水声调制解调器

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664474

N. Nowsheen, C. Benson, M. Frater

{"title":"A high data-rate, software-defined underwater acoustic modem","authors":"N. Nowsheen, C. Benson, M. Frater","doi":"10.1109/OCEANS.2010.5664474","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664474","url":null,"abstract":"Most underwater acoustic modems offer only low data rates. This is largely because they operate at low frequency, which limits the channel bandwidth available, and hence the symbol rate. The low frequency acoustic channel suffers from substantial multipath and doppler effects, which constrain the signal quality at the receiver. As a result only 1 or 2 bits per symbol are achieved, with the effective data rate further reduced by error control coding. High frequency acoustic signals are heavily attenuated in water, severely constraining the range of high frequency links. High frequency signals however offer substantially greater signal bandwidth, and probably improved channel quality which guides our design choice of a high frequency acoustic modem for underwater communication. Contemporary Field Programmable Gate Arrays (FPGAs) can provide good system functionality at low cost and with the flexibility to perform rapid testing and development of communication algorithms. They may also be competitive in production systems. In this paper we describe current progress in development of a high frequency, high data-rate modem which is implemented entirely in FPGA. This differs from most existing modems which are based on DSP processors. Being software defined, the modem is flexible because the parameters can be reconfigured with relative ease, minimising the cost of rework as the design evolves. This modem will not only demonstrate the feasibility of high frequency FPGA based modems, but will also be a valuable tool to provide a better understanding of the high frequency acoustic channel, and demonstrate the utility of absorption to enhance channel re-use rates in underwater acoustic networks. The modulator has been implemented in the FPGA, to produce laboratory and open water tests that conform to modelling. The demodulator has been implemented in Matlab, and recovers the carrier, code synchronisation and data from recordings of both laboratory and open water tests. Coding of the demodulator into the FPGA is currently in progress.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"30 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":"127982742","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: 47

Emerging capabilities for autonomous inspection repair and maintenance 新兴的自主检测、维修和维护能力

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664441

D. Mcleod

{"title":"Emerging capabilities for autonomous inspection repair and maintenance","authors":"D. Mcleod","doi":"10.1109/OCEANS.2010.5664441","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664441","url":null,"abstract":"Inspection Repair and Maintenance (IRM) of Deepwater Oil and Gas infrastructure is currently limited to the capability provided by today's work class Remotely Operated Vehicles. A significant portion of ROV operations underutilize their work capabilities for routine tasks such as inspection, survey, and light intervention and yet still require large dynamically positioned surface vessels and large, heavy deck spreads including umbilical winches and launch and recovery gear along with the associated costs of crew system maintenance and mobilization/demobilization. AUVs capabilities are emerging that permit deepwater autonomous inspection, repair and light intervention, eliminating the restrictions imposed by an ROV at a significantly lower cost to the operator by reducing support ship requirements, mobilization and demobilization costs, offshore crew size and skills, and greater inspection efficiency. Critical technological advancements include mature hover capable vehicles with sufficient energy to conduct deepwater operations, modular autonomous perception and response architecture, and new technologies such as 3D sonar, 3D lasers, and automated real time change detection. Similar to the revolution that occurred with ROVs in the '80s and '90s, AUVs are rapidly advancing in capability and will play a significant role in deepwater operations. While the specific policy implications of the Deepwater Horizon disaster are not predictable we can expect that deepwater drilling and production will require more frequent inspection and testing of subsea assets. Operating companies will be searching for cost effective and safe means of accomplishing deepwater inspections, and AUVs offer a compelling solution.","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":"128796311","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: 13

On the use of adaptive beam forming techniques for geoacoustic inversion of marine ambient noise 自适应波束形成技术在海洋环境噪声地球声反演中的应用

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664300

L. Muzi, M. Siderius, J. Gebbie, J. Paddock

引用次数: 5