Pub Date : 2015-10-01DOI: 10.23919/OCEANS.2015.7404488
Richard Mills, Øyvind Hegrenæs
The majority of cruising Autonomous Underwater Vehicles (AUVs) rely on similar technologies for navigation and positioning solutions. This paper examines the traditional approach and some enhancements designed to improve autonomous operations that are available today. Finally it will explore some new techniques under current development. Examples of equipment and performance will be provided from Kongsberg Maritime's experience as the leading manufacturer of survey class AUVs.
{"title":"Improving Autonomous navigation and positioning for commercial AUV operations","authors":"Richard Mills, Øyvind Hegrenæs","doi":"10.23919/OCEANS.2015.7404488","DOIUrl":"https://doi.org/10.23919/OCEANS.2015.7404488","url":null,"abstract":"The majority of cruising Autonomous Underwater Vehicles (AUVs) rely on similar technologies for navigation and positioning solutions. This paper examines the traditional approach and some enhancements designed to improve autonomous operations that are available today. Finally it will explore some new techniques under current development. Examples of equipment and performance will be provided from Kongsberg Maritime's experience as the leading manufacturer of survey class AUVs.","PeriodicalId":403976,"journal":{"name":"OCEANS 2015 - MTS/IEEE Washington","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116096762","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}
Pub Date : 2015-10-01DOI: 10.23919/OCEANS.2015.7404566
A. Gangopadhyay, Kevin Lydon, Jeffrey A. Rezendes, R. Balasubramanian, I. Valova
Developing computational methods to automatically identify the Gulf Stream North Wall (GSNW) and similar currents in the ocean is a long-standing need for many types of operational ocean models. Specifically, the Feature-Oriented regional modeling system requires an accurate digitization of the GSNW and Rings (eddies) on a regular basis. Typical methods to determine its position and boundaries require skilled human operators to do a time-consuming manual extraction of visualized features. These experts are performing a feature extraction task that can be automated to save time, guarantee objectivity, and potentially increase precision.In this paper we present first-results from two independent approaches of addressing this issue. In one of the approaches, the dynamical approach, the methodology begins by finding the most-likely bounds of iso-sea-surface-height contours within which the Gulf Stream north wall might fall. Other features, such as eddies, which are also captured, will be set aside after a round of shape analysis. Any gap in the isoheight contours is filled with segments that are generated by combining the slopes from different heights.The second, a machine-learning approach uses an artificial neural network over a GSNW dataset, which has been generated weekly over past six years (2009-2015) by analysts. An artificial neural network is a type of learning algorithm designed as a system of neurons with connections among them. This neural network will first use the analyst-designated GSNW paths to determine the neural weights of the radial basis functions. Then the network will use the concurrent sea-surface height and temperature data that were used to identify those lines, and train itself to develop a smart network which will be able to identify GSNW paths from the concurrent satellite images on its own, with little to no human intervention.In the long-term, we expect to merge the two techniques in a unique and unifying construct to be used operationally. A general approach of this methodology has the potential of being used for other similar operational modeling, reanalysis and skill assessment of numerical model system with data assimilation.
{"title":"Towards an automated detection of the Gulf Stream North Wall from concurrent satellite images","authors":"A. Gangopadhyay, Kevin Lydon, Jeffrey A. Rezendes, R. Balasubramanian, I. Valova","doi":"10.23919/OCEANS.2015.7404566","DOIUrl":"https://doi.org/10.23919/OCEANS.2015.7404566","url":null,"abstract":"Developing computational methods to automatically identify the Gulf Stream North Wall (GSNW) and similar currents in the ocean is a long-standing need for many types of operational ocean models. Specifically, the Feature-Oriented regional modeling system requires an accurate digitization of the GSNW and Rings (eddies) on a regular basis. Typical methods to determine its position and boundaries require skilled human operators to do a time-consuming manual extraction of visualized features. These experts are performing a feature extraction task that can be automated to save time, guarantee objectivity, and potentially increase precision.In this paper we present first-results from two independent approaches of addressing this issue. In one of the approaches, the dynamical approach, the methodology begins by finding the most-likely bounds of iso-sea-surface-height contours within which the Gulf Stream north wall might fall. Other features, such as eddies, which are also captured, will be set aside after a round of shape analysis. Any gap in the isoheight contours is filled with segments that are generated by combining the slopes from different heights.The second, a machine-learning approach uses an artificial neural network over a GSNW dataset, which has been generated weekly over past six years (2009-2015) by analysts. An artificial neural network is a type of learning algorithm designed as a system of neurons with connections among them. This neural network will first use the analyst-designated GSNW paths to determine the neural weights of the radial basis functions. Then the network will use the concurrent sea-surface height and temperature data that were used to identify those lines, and train itself to develop a smart network which will be able to identify GSNW paths from the concurrent satellite images on its own, with little to no human intervention.In the long-term, we expect to merge the two techniques in a unique and unifying construct to be used operationally. A general approach of this methodology has the potential of being used for other similar operational modeling, reanalysis and skill assessment of numerical model system with data assimilation.","PeriodicalId":403976,"journal":{"name":"OCEANS 2015 - MTS/IEEE Washington","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122694230","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":"Optimal design for consensus of second order multi-agent systems with damping term","authors":"Jiajia Zhou, Peng Shi, Xinqian Bian, Lanyong Zhang, Wei Zhang","doi":"10.23919/oceans.2015.7404370","DOIUrl":"https://doi.org/10.23919/oceans.2015.7404370","url":null,"abstract":"","PeriodicalId":403976,"journal":{"name":"OCEANS 2015 - MTS/IEEE Washington","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122469577","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}
Pub Date : 2015-10-01DOI: 10.23919/OCEANS.2015.7404480
Jingpeng Liu, Bing Zheng, Lifeng Zhao, Zhaoyang Gong
Underwater laser communication has been developed in the field of deep-sea exploration, also become a highlight of modern communication technology research. It has the edges of hidden, safe, non-contact and rapid mobility. By now, most data exchange and transmission between underwater sensors and devices are achieved by RS-232 serial ports communication. But it is not able to meet the demands of present underwater communication due to the limitations of transmitting rate and distance. For the first version of our laser system the signals flowing through the RS-232 ports had not been modulated. Therefore, the bit error rate of our previous work was adversely high. In this paper, we progress our system by introducing in a novel signal modulating module, which mainly consists of FPGAs and PPM method. Considering with the effect of absorption and scattering [1], a series of experiments are performed in this paper: unmodulated and modulated underwater laser communication experiments under different visibility water. By comparing the bit error rate results, we suggest that the whole underwater laser communication system is compact, efficient and reliable. Finally, we based on multiple of visibility, the theoretical communication distance of the system can be estimated.
{"title":"A design of underwater wireless laser communication system based on PPM modulating method","authors":"Jingpeng Liu, Bing Zheng, Lifeng Zhao, Zhaoyang Gong","doi":"10.23919/OCEANS.2015.7404480","DOIUrl":"https://doi.org/10.23919/OCEANS.2015.7404480","url":null,"abstract":"Underwater laser communication has been developed in the field of deep-sea exploration, also become a highlight of modern communication technology research. It has the edges of hidden, safe, non-contact and rapid mobility. By now, most data exchange and transmission between underwater sensors and devices are achieved by RS-232 serial ports communication. But it is not able to meet the demands of present underwater communication due to the limitations of transmitting rate and distance. For the first version of our laser system the signals flowing through the RS-232 ports had not been modulated. Therefore, the bit error rate of our previous work was adversely high. In this paper, we progress our system by introducing in a novel signal modulating module, which mainly consists of FPGAs and PPM method. Considering with the effect of absorption and scattering [1], a series of experiments are performed in this paper: unmodulated and modulated underwater laser communication experiments under different visibility water. By comparing the bit error rate results, we suggest that the whole underwater laser communication system is compact, efficient and reliable. Finally, we based on multiple of visibility, the theoretical communication distance of the system can be estimated.","PeriodicalId":403976,"journal":{"name":"OCEANS 2015 - MTS/IEEE Washington","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121975684","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}
Pub Date : 2015-10-01DOI: 10.23919/OCEANS.2015.7404592
M. Hoeberechts, D. Owens, D. J. Riddell, A. D. Robertson
This paper describes initiatives underway at Ocean Networks Canada (ONC) in using video data as a tool for public engagement and education: live video streams from cameras on the seafloor, citizen science using video data, audience participation in deep-sea expeditions, and K-12 engagement through the Ocean Sense program. Live and archived video attract the majority of user traffic on ONC's website and can be leveraged to direct the viewers to other content and messaging, enhancing their engagement with the deep-sea environment. Public interest in scientific discovery creates a user base for citizen science initiatives, while educational audiences can be connected to both realtime and asynchronous learning materials. The power of live connections is also harnessed during research expeditions, which can be extended from the ship and the seafloor directly into the classroom.
{"title":"The Power of Seeing: Experiences using video as a deep-sea engagement and education tool","authors":"M. Hoeberechts, D. Owens, D. J. Riddell, A. D. Robertson","doi":"10.23919/OCEANS.2015.7404592","DOIUrl":"https://doi.org/10.23919/OCEANS.2015.7404592","url":null,"abstract":"This paper describes initiatives underway at Ocean Networks Canada (ONC) in using video data as a tool for public engagement and education: live video streams from cameras on the seafloor, citizen science using video data, audience participation in deep-sea expeditions, and K-12 engagement through the Ocean Sense program. Live and archived video attract the majority of user traffic on ONC's website and can be leveraged to direct the viewers to other content and messaging, enhancing their engagement with the deep-sea environment. Public interest in scientific discovery creates a user base for citizen science initiatives, while educational audiences can be connected to both realtime and asynchronous learning materials. The power of live connections is also harnessed during research expeditions, which can be extended from the ship and the seafloor directly into the classroom.","PeriodicalId":403976,"journal":{"name":"OCEANS 2015 - MTS/IEEE Washington","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117022406","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}
Pub Date : 2015-10-01DOI: 10.23919/OCEANS.2015.7401847
H. Haines, N. Thomas
Winds at 80 m elevation have been estimated with a stability-based height adjustment scheme to study the feasibility of utility-scale wind energy offshore of North Carolina. Data sources are the daily ASCAT 10 m wind field as measured by the METOP-A satellite, the North American Regional Reanalysis (NARR) estimates of near-surface atmospheric temperature, pressure and humidity and the National Climate Data Center's optimally-interpolated Advanced Very High Resolution Radiometer (AVHRR-OI) sea surface temperature (SST). The study focuses on the 2008-2012 time period. The COARE V3.0 algorithm is used to provide the stability-based height adjustment scheme. Data from six buoys have been used to establish validity of the remotely-sensed and modeled fields. A variety of results were produced, including long-term average wind speeds, wind power density and capacity factor at hub height, and a monthly climatology of these quantities. In this note the focus is on seasonal variations utilizing the monthly climatologies. Using the climatologies the largest differences between the neutral and stability-based schemes occur in winter and spring when and where stable atmospheric conditions are most common. There is a significant difference in the annual variation of atmospheric stability north and south of Cape Hatteras. Only the inner shelf region is prone to stable conditions during winter and spring south of Cape Hatteras, whereas the full width of the shelf is prone to stable conditions from fall into early summer north of Cape Hatteras. Where stable conditions occur the stability-based 80 m wind speeds are 2-3 m/s greater than 80 m neutral wind speeds, and where unstable conditions occur the stability-based 80 m wind speeds are 0.5-1 m/s less than the 80 m neutral wind speeds. The result is a pattern in the 80 m stability-based winds with notably greater speeds near the coastline than expected from a neutral height adjustment.
{"title":"An observational, stability-based estimate of 80 m wind speed offshore of North Carolina - seasonal patterns","authors":"H. Haines, N. Thomas","doi":"10.23919/OCEANS.2015.7401847","DOIUrl":"https://doi.org/10.23919/OCEANS.2015.7401847","url":null,"abstract":"Winds at 80 m elevation have been estimated with a stability-based height adjustment scheme to study the feasibility of utility-scale wind energy offshore of North Carolina. Data sources are the daily ASCAT 10 m wind field as measured by the METOP-A satellite, the North American Regional Reanalysis (NARR) estimates of near-surface atmospheric temperature, pressure and humidity and the National Climate Data Center's optimally-interpolated Advanced Very High Resolution Radiometer (AVHRR-OI) sea surface temperature (SST). The study focuses on the 2008-2012 time period. The COARE V3.0 algorithm is used to provide the stability-based height adjustment scheme. Data from six buoys have been used to establish validity of the remotely-sensed and modeled fields. A variety of results were produced, including long-term average wind speeds, wind power density and capacity factor at hub height, and a monthly climatology of these quantities. In this note the focus is on seasonal variations utilizing the monthly climatologies. Using the climatologies the largest differences between the neutral and stability-based schemes occur in winter and spring when and where stable atmospheric conditions are most common. There is a significant difference in the annual variation of atmospheric stability north and south of Cape Hatteras. Only the inner shelf region is prone to stable conditions during winter and spring south of Cape Hatteras, whereas the full width of the shelf is prone to stable conditions from fall into early summer north of Cape Hatteras. Where stable conditions occur the stability-based 80 m wind speeds are 2-3 m/s greater than 80 m neutral wind speeds, and where unstable conditions occur the stability-based 80 m wind speeds are 0.5-1 m/s less than the 80 m neutral wind speeds. The result is a pattern in the 80 m stability-based winds with notably greater speeds near the coastline than expected from a neutral height adjustment.","PeriodicalId":403976,"journal":{"name":"OCEANS 2015 - MTS/IEEE Washington","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128223030","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}
Pub Date : 2015-10-01DOI: 10.23919/OCEANS.2015.7404446
Masanori Muto
This paper shows the results of studies focusing on interaction between ocean governance and ocean-related data & information. This will include, first of all, the international comparison of the integrated marine information system (clearing house, and Marine Cadastre or Marine Spatial Data Infrastructure: MSDI), marine policy, and Marine Spatial Planning (MSP), as an effective decision making tool or process for science-based marine management and governance. This paper also shows the results of study on the needs of ocean survey conducted for emerging countries mainly in the Asia and Pacific region which are trying to expand ocean-related activities and demanding the ocean management or “governance” capabilities. The results showed the great needs for conducting ocean survey as the first step to understand their oceans, as well as the needs for the database management (e.g. integrated marine information system), application (including the interest in Marine Spatial Planning: MSP), and capacity building in marine-related government agencies/research institutions. Upon all these analysis on the dynamics of how the scientific tools (i.e. ocean survey and integrated information system) are linked to the decision making mechanism (i.e. MSP) which could ultimately assist the possible legislation necessary for the ocean administration, this paper illustrates the possible ways to strengthen the “ocean governance” capabilities to manage the sustainable exploitation, development, and conservation of our oceans by the ocean-related data & information management, especially focusing on Japan and Asia and Pacific region.
{"title":"Ocean governance with data and information management","authors":"Masanori Muto","doi":"10.23919/OCEANS.2015.7404446","DOIUrl":"https://doi.org/10.23919/OCEANS.2015.7404446","url":null,"abstract":"This paper shows the results of studies focusing on interaction between ocean governance and ocean-related data & information. This will include, first of all, the international comparison of the integrated marine information system (clearing house, and Marine Cadastre or Marine Spatial Data Infrastructure: MSDI), marine policy, and Marine Spatial Planning (MSP), as an effective decision making tool or process for science-based marine management and governance. This paper also shows the results of study on the needs of ocean survey conducted for emerging countries mainly in the Asia and Pacific region which are trying to expand ocean-related activities and demanding the ocean management or “governance” capabilities. The results showed the great needs for conducting ocean survey as the first step to understand their oceans, as well as the needs for the database management (e.g. integrated marine information system), application (including the interest in Marine Spatial Planning: MSP), and capacity building in marine-related government agencies/research institutions. Upon all these analysis on the dynamics of how the scientific tools (i.e. ocean survey and integrated information system) are linked to the decision making mechanism (i.e. MSP) which could ultimately assist the possible legislation necessary for the ocean administration, this paper illustrates the possible ways to strengthen the “ocean governance” capabilities to manage the sustainable exploitation, development, and conservation of our oceans by the ocean-related data & information management, especially focusing on Japan and Asia and Pacific region.","PeriodicalId":403976,"journal":{"name":"OCEANS 2015 - MTS/IEEE Washington","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128957693","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}
Pub Date : 2015-10-01DOI: 10.23919/OCEANS.2015.7404507
R. Perry, K. Satterlee, L. Brzuzy, Kevin M. Martin, R. Vandermeulen, S. Howden, P. Leung, M. Vogel, N. Sharma, W. McCall, R. Hervey, B. Kirkpatrick, S. Watson, Hyun‐Sook Kim
Shell Exploration & Production Company is working with academic, non-profit, and federal stakeholders in the Gulf of Mexico to develop and implement long term environmental monitoring programs. One such program uses autonomous underwater gliders to collect near real-time oceanographic data for enhancing the understanding of the offshore physical environment and to improve estimates of upper ocean heat content for enhanced hurricane prediction and forecast models. Through a Memorandum of Agreement in 2008 between Shell and the National Oceanic and Atmospheric Administration, this partnership leverages the strengths of each collaborator to build a comprehensive and sustainable data collection program to better assess environmental conditions and assure the environmental sustainability of Shell's activities in the Gulf of Mexico. An important element of the collaboration includes sharing data and results with the broader Gulf of Mexico stakeholder community by working with regional partners such as the Gulf of Mexico Coastal Ocean Observing System. In this paper, we focus on 2014 physical environment and glider results and public-private partnership model benefits to expanding regional ocean observing capacity in the Gulf of Mexico.
{"title":"Ocean observing collaboration to improve hurricane forecasting and modeling in the Gulf of Mexico","authors":"R. Perry, K. Satterlee, L. Brzuzy, Kevin M. Martin, R. Vandermeulen, S. Howden, P. Leung, M. Vogel, N. Sharma, W. McCall, R. Hervey, B. Kirkpatrick, S. Watson, Hyun‐Sook Kim","doi":"10.23919/OCEANS.2015.7404507","DOIUrl":"https://doi.org/10.23919/OCEANS.2015.7404507","url":null,"abstract":"Shell Exploration & Production Company is working with academic, non-profit, and federal stakeholders in the Gulf of Mexico to develop and implement long term environmental monitoring programs. One such program uses autonomous underwater gliders to collect near real-time oceanographic data for enhancing the understanding of the offshore physical environment and to improve estimates of upper ocean heat content for enhanced hurricane prediction and forecast models. Through a Memorandum of Agreement in 2008 between Shell and the National Oceanic and Atmospheric Administration, this partnership leverages the strengths of each collaborator to build a comprehensive and sustainable data collection program to better assess environmental conditions and assure the environmental sustainability of Shell's activities in the Gulf of Mexico. An important element of the collaboration includes sharing data and results with the broader Gulf of Mexico stakeholder community by working with regional partners such as the Gulf of Mexico Coastal Ocean Observing System. In this paper, we focus on 2014 physical environment and glider results and public-private partnership model benefits to expanding regional ocean observing capacity in the Gulf of Mexico.","PeriodicalId":403976,"journal":{"name":"OCEANS 2015 - MTS/IEEE Washington","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130486517","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}
Pub Date : 2015-10-01DOI: 10.23919/OCEANS.2015.7401905
Derek Alley, B. Cochenour, L. Mullen
Conventional optical imaging systems have limited performance in Degraded Visual Environments (DVE) such as dust, fog, sand, and turbid water due to multiple scattering of the light on the path from the source to the target. Their large platform size also makes them unfavorable for compact, autonomous systems. In recent years, researchers at NAVAIR in Patuxent River, MD have developed a compact submersible laser imaging system based on a multistatic system architecture, allowing the source and multiple receivers to reside on separate, smaller, independent platforms. The system geometry can be better optimized for the environment, allowing it to obtain high quality imagery through much higher attenuation lengths (between the target and receiver) when compared to conventional imaging systems. The smaller source also lends itself to integration into an autonomous underwater vehicle (AUV). A compact, multistatic imaging system designed for integration into a REMUS 600 AUV has been developed and is currently being tested in a laboratory environment. System design and laboratory test plans will be presented.
{"title":"Multistatic optical imaging system compatible with AUV platforms","authors":"Derek Alley, B. Cochenour, L. Mullen","doi":"10.23919/OCEANS.2015.7401905","DOIUrl":"https://doi.org/10.23919/OCEANS.2015.7401905","url":null,"abstract":"Conventional optical imaging systems have limited performance in Degraded Visual Environments (DVE) such as dust, fog, sand, and turbid water due to multiple scattering of the light on the path from the source to the target. Their large platform size also makes them unfavorable for compact, autonomous systems. In recent years, researchers at NAVAIR in Patuxent River, MD have developed a compact submersible laser imaging system based on a multistatic system architecture, allowing the source and multiple receivers to reside on separate, smaller, independent platforms. The system geometry can be better optimized for the environment, allowing it to obtain high quality imagery through much higher attenuation lengths (between the target and receiver) when compared to conventional imaging systems. The smaller source also lends itself to integration into an autonomous underwater vehicle (AUV). A compact, multistatic imaging system designed for integration into a REMUS 600 AUV has been developed and is currently being tested in a laboratory environment. System design and laboratory test plans will be presented.","PeriodicalId":403976,"journal":{"name":"OCEANS 2015 - MTS/IEEE Washington","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130512324","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}
Pub Date : 2015-10-01DOI: 10.23919/OCEANS.2015.7401949
Liqin Fu, Yiru Wang, Zhebin Zhang, Rui Nian, T. Yan, A. Lendasse
The point feature detection is one of the most essential and fundamental tasks for underwater objects in ocean investigations. In this paper, a streamline AUV system that adopts the side scan sonar on board has been set up to explore our underwater visual tasks. Before attempting to detect the point features, the raw underwater sonar images must be preprocessed by shadow removal. The saliency map will be further explored with the contrast determination filter at various scales and then the point feature detection model can be completed on the basis of the saliency map. It is shown from the simulation experiments that the proposed model could achieve great performances in the point feature detection with both robustness and effectiveness.
{"title":"A shadow-removal based saliency map for point feature detection of underwater objects","authors":"Liqin Fu, Yiru Wang, Zhebin Zhang, Rui Nian, T. Yan, A. Lendasse","doi":"10.23919/OCEANS.2015.7401949","DOIUrl":"https://doi.org/10.23919/OCEANS.2015.7401949","url":null,"abstract":"The point feature detection is one of the most essential and fundamental tasks for underwater objects in ocean investigations. In this paper, a streamline AUV system that adopts the side scan sonar on board has been set up to explore our underwater visual tasks. Before attempting to detect the point features, the raw underwater sonar images must be preprocessed by shadow removal. The saliency map will be further explored with the contrast determination filter at various scales and then the point feature detection model can be completed on the basis of the saliency map. It is shown from the simulation experiments that the proposed model could achieve great performances in the point feature detection with both robustness and effectiveness.","PeriodicalId":403976,"journal":{"name":"OCEANS 2015 - MTS/IEEE Washington","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130528569","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}
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