2012 OceansPub Date : 2012-10-01DOI: 10.1109/OCEANS.2012.6405125
Ruiqin Zhao, Xiaohong Shen, Jing-Jie Gao, Yuzhi Zhang, Haiyan Wang
{"title":"Localization in underwater acoustic networks based on double rates","authors":"Ruiqin Zhao, Xiaohong Shen, Jing-Jie Gao, Yuzhi Zhang, Haiyan Wang","doi":"10.1109/OCEANS.2012.6405125","DOIUrl":"https://doi.org/10.1109/OCEANS.2012.6405125","url":null,"abstract":"Localization is a major issue and a challenging task for underwater acoustic networks. The characteristics of underwater acoustic networks are fundamentally different from that of terrestrial networks. For example, it is not easy to get GPS into water and underwater acoustic networks often just have few anchors. Thus many of the localization schemes for terrestrial networks cannot be used directly in underwater acoustic networks. In this paper, we present a localization scheme based on double rates which competes node localization with only one anchor. It is a range-based localization scheme which separates data transmission into two modes by changing the symbol durations at physical layer. Based on the double rates schemes, our method completes acoustic ranging among the whole network with only one hop, which eliminates the accumulated inaccuracy caused by multi-hop ranging in localization schemes based on single rate. Simulation results show that our method has the highest positioning accuracy compared with MSL and DV-Hop.","PeriodicalId":434023,"journal":{"name":"2012 Oceans","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128887003","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}
2012 OceansPub Date : 2012-10-01DOI: 10.1109/OCEANS.2012.6404902
F. O. Donncha, E. Ragnoli, S. Zhuk, F. Suits, M. Hartnett
{"title":"Surface flow dynamics within an exposed wind-driven bay: Combined HF radar observations and model simulations","authors":"F. O. Donncha, E. Ragnoli, S. Zhuk, F. Suits, M. Hartnett","doi":"10.1109/OCEANS.2012.6404902","DOIUrl":"https://doi.org/10.1109/OCEANS.2012.6404902","url":null,"abstract":"In this study, observations from a high-frequency radar (HFR) deployment are combined with numerical model simulations to investigate the relative contributions of surface current forcing. A tidal decomposition of the relevant datasets was applied by fitting the flow profile to a finite set of sinusoids at specific frequencies related to astronomical parameters. The resultant time-series pair comprised tidal harmonic constituents and residuals composed of primarily wind-driven surface flows. Complex correlation coefficients between these data and both numerical simulations and winds were used to further investigate both bay dynamics and numerical model performance. Results of analysis demonstrate good agreement between HFR and model data, particularly for tidal harmonics. Analysis of wind driven surface currents illustrate the complex nature of flow dynamics and the many factors requiring consideration.","PeriodicalId":434023,"journal":{"name":"2012 Oceans","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130862355","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}
2012 OceansPub Date : 2012-10-01DOI: 10.1109/OCEANS.2012.6405056
F. Dalgleish, B. Ouyang, A. Vuorenkoski, B. Metzger, B. Ramos, W. Britton
{"title":"Extended range distributed laser serial imaging in turbid estuarine and coastal conditions","authors":"F. Dalgleish, B. Ouyang, A. Vuorenkoski, B. Metzger, B. Ramos, W. Britton","doi":"10.1109/OCEANS.2012.6405056","DOIUrl":"https://doi.org/10.1109/OCEANS.2012.6405056","url":null,"abstract":"One pressing need in the drive to better secure the coastal environment and associated natural and manmade assets is the ability to rapidly identify suspicious undersea objects. Typically murky harbor and coastal waters render this task nearly impossible, even with the most sophisticated underwater camera technologies. However, simpler system architectures that can extend operational range and also rapidly transmit high-quality imagery and other information to remote locations could be realized if a serial laser illuminator and single element detector sub-systems are operated in a distributed configuration, possibly among multiple undersea robotic platforms. To gain a better understanding of the potential performance of this distributed undersea imaging technique in natural waters, and also to determine if precise alignment is required between laser illuminator and detector sub-systems during such operations, the Ocean Visibility and Optics Laboratory at Harbor Branch Oceanographic Institute recently developed a prototype distributed laser imager. The system was tested recently in a range of very turbid estuarine conditions off the east coast of Florida. Results from these experiments as well as a description of this distributed laser imager prototype will be presented and discussed in this paper.","PeriodicalId":434023,"journal":{"name":"2012 Oceans","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128798346","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}
2012 OceansPub Date : 2012-10-01DOI: 10.1109/OCEANS.2012.6404829
Weimin Huang, E. Gill, Zhifeng Zhong
{"title":"Enhancement of the normalized scalar product method for surface current measurement using nautical radar","authors":"Weimin Huang, E. Gill, Zhifeng Zhong","doi":"10.1109/OCEANS.2012.6404829","DOIUrl":"https://doi.org/10.1109/OCEANS.2012.6404829","url":null,"abstract":"An algorithm to improve the normalized scalar product (NSP) method of extracting sea surface currents from X-band nautical radar image sequences is presented. In the NSP method, two-dimensional searching over a suitable range of current velocities with an appropriate resolution is required to determine the velocity that maximizes the normalized scalar product. The search may take an extremely long time if the range is wide or a high resolution is sought. In order to reduce the computation involved in the procedure, the proposed algorithm uses variable ranges and resolutions instead of fixed ones. Simulated inversion results for a variety of current velocities are obtained in order to check the internal consistency of the algorithm. With this algorithm, it is observed that the search time can be reduced significantly while obtaining high precision. The performance of the algorithm is also validated using real radar data collected on the east coast of Canada.","PeriodicalId":434023,"journal":{"name":"2012 Oceans","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125376465","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}
2012 OceansPub Date : 2012-10-01DOI: 10.1109/OCEANS.2012.6404951
I. Sultan, B. Wells, S. Wood
{"title":"Development of a wireless control and monitoring system for wave energy converters","authors":"I. Sultan, B. Wells, S. Wood","doi":"10.1109/OCEANS.2012.6404951","DOIUrl":"https://doi.org/10.1109/OCEANS.2012.6404951","url":null,"abstract":"The Ocean, inherently unstable and uncertain, is one of the harshest environments to test engineering designs; and with the increasing interest in ocean renewable energies, methods and tools must be developed for faster, reliable, low cost, and effective evaluation of the ocean energy technologies. This paper proposes one such tool/system, a small-scale, portable, wireless and universal Power Control and Monitoring Unit (PCMU) for the design and performance evaluation of wave energy converters (WECs). A prototype PCMU system was successfully deployed on June 8th, 2012 with wave energy convertor systems developed at Florida Institute of Technology (Florida Tech).","PeriodicalId":434023,"journal":{"name":"2012 Oceans","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126606753","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}
2012 OceansPub Date : 2012-10-01DOI: 10.1109/OCEANS.2012.6405004
C. Evans, H. Roarty, J. Kohut, S. Glenn
{"title":"Examination of the SeaSonde wave processing settings and the effects of shallow water on wave measurements","authors":"C. Evans, H. Roarty, J. Kohut, S. Glenn","doi":"10.1109/OCEANS.2012.6405004","DOIUrl":"https://doi.org/10.1109/OCEANS.2012.6405004","url":null,"abstract":"Derivation of wave measurements from the SeaSonde high frequency (HF) radar software is challenging when applied to the U.S. East Coast continental shelf. Shallow water depths have the capability of saturating the 1st and 2nd order Bragg, inevitably leading to imprecise estimates of the wave height conditions. This paper looks to examine the settings defined in the SeaSonde in an environment where water depth is less than 30 m within the first few range cells off of the coast of New Jersey. Wave measurements were taken from a 13 MHz standard range CODAR (Coastal Ocean Dynamics Applications Radar) antenna and compared with NDBC (National Data Buoy Center) 3-meter discuss buoys located outside New York Harbor and Delaware Bay.","PeriodicalId":434023,"journal":{"name":"2012 Oceans","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126635627","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}
2012 OceansPub Date : 2012-10-01DOI: 10.1109/OCEANS.2012.6404993
Shuangshuang Fan, A. Wolek, C. Woolsey
{"title":"Stability and performance of underwater gliders","authors":"Shuangshuang Fan, A. Wolek, C. Woolsey","doi":"10.1109/OCEANS.2012.6404993","DOIUrl":"https://doi.org/10.1109/OCEANS.2012.6404993","url":null,"abstract":"Underwater gliders are efficient mobile sensor platforms that can be deployed for months at a time, traveling thousands of kilometers. As with any vehicle, different applications impose different mission requirements which impact vehicle design. In this paper, we consider a conventional glider configuration and investigate the relationship between geometry and the stability and performance characteristics. We consider two specific flight conditions: minimum drag and maximum horizontal speed. Configuration parameters of interest include the fineness ratio of the hull; the wing position, wingspan, and aspect ratio; and the area and position of the vertical stabilizer.","PeriodicalId":434023,"journal":{"name":"2012 Oceans","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122544822","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}
2012 OceansPub Date : 2012-10-01DOI: 10.1109/OCEANS.2012.6404997
Liling Jin, Jianlong Li, Wen Xu
{"title":"Tracking sound speed field under internal wave perturbation with the unscented Kalman filter","authors":"Liling Jin, Jianlong Li, Wen Xu","doi":"10.1109/OCEANS.2012.6404997","DOIUrl":"https://doi.org/10.1109/OCEANS.2012.6404997","url":null,"abstract":"Model-based signal processing methods, such as matched-field processing, are concerned with exploiting the combination of the sound propagation physics in an ocean waveguide and the observation data. As such, they require accurate knowledge of the ocean acoustic environment. Tracking of environmental uncertainties is of great interest for model-based signal processing. This paper further develops the approach of acoustic data assimilation (ADA) for tracking the sound speed field under internal wave perturbations. Specifically, the sequential method of the UKF is used to implement the ADA for solving the nonlinear tracking problem. The simulation results demonstrate the validity of the developed approach.","PeriodicalId":434023,"journal":{"name":"2012 Oceans","volume":"566 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123118582","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}
2012 OceansPub Date : 2012-10-01DOI: 10.1109/OCEANS.2012.6404807
Y. Hejazin, W. Jones, S. El-Nimri
{"title":"An ocean roughness correction algorithm for retrieving salinity on Aquarius","authors":"Y. Hejazin, W. Jones, S. El-Nimri","doi":"10.1109/OCEANS.2012.6404807","DOIUrl":"https://doi.org/10.1109/OCEANS.2012.6404807","url":null,"abstract":"Aquarius/SAC-D is a joint NASA/CONAE (Argentine Space Agency) Earth Sciences satellite mission to measure the global sea surface salinity (SSS) using an L-band radiometer to measure ocean blackbody emissions also known as brightness temperature (Tb). The application of L-band radiometry to measure SSS is a difficult task, and there are many corrections that must be made correctly to obtain accurate SSS data. One of the major error sources is the effect of ocean roughness that “warms” the ocean brightness temperature (Tb). The Aquarius baseline approach uses the radar scatterometer to provide this ocean roughness correction through the correlation of radar backscatter with the excess ocean emissivity without directly measuring the surface wind speed. This paper provides an alternative approach using a theoretical Radiative Transfer Model (RTM) driven by numerical weather forecast model surface winds. The theoretical basis of our algorithm is described and results are compared with the AQ baseline scatterometer method.","PeriodicalId":434023,"journal":{"name":"2012 Oceans","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126590259","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}
2012 OceansPub Date : 2012-10-01DOI: 10.1109/OCEANS.2012.6405108
K. Shepherd, V. Auger, K. Tamburri
{"title":"Observatory challenges solved: Increased capabilities and potential through innovative solutions and high operational efficiency in a climate of shrinking budgets","authors":"K. Shepherd, V. Auger, K. Tamburri","doi":"10.1109/OCEANS.2012.6405108","DOIUrl":"https://doi.org/10.1109/OCEANS.2012.6405108","url":null,"abstract":"In a time where the increasing need for better knowledge of our oceans contrasts with a climate of tightening budgets, CSSF and HTI present a complete complement of innovative and cost-efficient solutions to many of the challenges faced in the installation and maintenance of ocean networks infrastructure from the subsea nodes out to all of the peripheral instruments.","PeriodicalId":434023,"journal":{"name":"2012 Oceans","volume":"49 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120915953","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}