Proceedings of OCEANS '93最新文献_第8页

Slope and hydrodynamic modulation of radar scatter from the sea 海上雷达散射的坡度和水动力调制

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326203

V. Hesany, R. Moore, S. Haimov

{"title":"Slope and hydrodynamic modulation of radar scatter from the sea","authors":"V. Hesany, R. Moore, S. Haimov","doi":"10.1109/OCEANS.1993.326203","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326203","url":null,"abstract":"Microwave backscatter from the ocean surface is largely due to Bragg scattering from short surface ripples. Modulation of the signal results from changes in the local angle of incidence as the local slope changes, and from variations in Bragg ripple amplitude. The slope (tilt) modulation can be modeled as a memoryless nonlinear system. The hydrodynamic modulation results from a nonuniform distribution of the amplitude of the small-scale ripples over the large-scale waves. For azimuthally traveling waves the hydrodynamic modulation dominates, while for waves propagating in other directions, both tilt and hydrodynamic modulation are significant. The authors developed a 35-GHz radar vector slope gauge (VSG) to measure the orthogonal components of the surface slopes within the radar footprint. Simultaneous measurements of the surface slope and radar cross section permit determination of the relative contribution of slope and hydrodynamic modulations to the overall fluctuation of the radar signal. The authors present a method for separating effects due to the surface tilting from hydrodynamic effects. They include a sample result based on this approach with data from the SAXON-FPN experiment in November, 1990.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129444770","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

Reconstruction and enhancement of sea-bed topography by using 2-D signal processing 基于二维信号处理的海底地形重建与增强

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326123

H. Wong, A. Antoniou

引用次数: 2

Passive acoustical measurements of scale, probability, and intensity of wave breaking 波破碎的尺度、概率和强度的被动声学测量

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326090

Li Ding, D. Farmer

引用次数: 3

Cloud masking for CoastWatch satellite imagery 海岸观察卫星图像的云掩蔽

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326122

E. Maturi, W. Pichel

引用次数: 5

Research on an oscillating fin propulsion control system 摆动鳍推进控制系统的研究

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326197

I. Yamamoto, Y. Terada, T. Nagamatu, Y. Imaizumi

引用次数: 19

Acoustic thermometry for Arctic Ocean climate 北冰洋气候的声测温

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326001

P. Mikhalevsky, R. Muench, A. Baggeroer

引用次数: 0

Validation of a real-time cable deployment control system for slack cable laying 松弛电缆布放实时电缆布放控制系统的验证

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326131

J. Andres, S. Jefferies, G. Gillenwaters

{"title":"Validation of a real-time cable deployment control system for slack cable laying","authors":"J. Andres, S. Jefferies, G. Gillenwaters","doi":"10.1109/OCEANS.1993.326131","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326131","url":null,"abstract":"The validation of a real-time control system for the deployment of submarine communication cables presented. The control system allows the user accurately control cable bottom slack and position the cable along a pre-planned route. The system was successfully used to lay an underwater acoustic tracking range for the US Navy. A total of eight, 40 mile long cables, each having eight in-line hydrophones and several repeaters were laid in water depths of 40 m to 1800 m off San Clemente Island, California. The hydrophones were placed within specific targets along the cable route despite multiple abrupt turns in the paths, and a fully functional acoustic range is now in place. The flexibility and accuracy of the system in controlling cable bottom slack and cable bottom placement are presented using data from this Navy cable lay. The importance of properly measuring drag coefficient and forecasting currents for deep ocean cable lays is also discussed. The cable deployment control system proved that it can provide proper ship and cable engine commands to recover from unexpected full ship stops and resume deployment operations with no adverse effects on the cable lay.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126829387","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

Experiments in dynamic positioning of a towed pipe 拖曳管道动态定位试验

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326237

F. Hover

引用次数: 4

Monitoring corrosion in submarine sonar domes 监测潜艇声纳穹顶的腐蚀情况

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326045

C. Sandwith, R.L. Ruedisueli, K. Booth, J.P. Papageorge, B. Eng

{"title":"Monitoring corrosion in submarine sonar domes","authors":"C. Sandwith, R.L. Ruedisueli, K. Booth, J.P. Papageorge, B. Eng","doi":"10.1109/OCEANS.1993.326045","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326045","url":null,"abstract":"The Applied Physics Laboratory at the University of Washington (APL-UW) and the Naval Sea Systems Command (NAVSEA) are involved in a long-term study to reduce corrosion in submarine sonar domes. Besides periodically inspecting the structures in tile domes and recommending improvements in their design, materials, and maintenance, APLUW has recently developed an instrument package to monitor selected parameters of the dome water in situ. Previously, analyses of dome-water corrosivity combined information from three sources: water samples collected as the dome was pumped out, pierside measurements, and laboratory tests of the electrochemical corrosion rate of typical materials used in the dome. With this procedure, dome water samples were obtained only at the end points of the operation cycle, i.e., during maintenance prior to and following patrol. The new instrument package (called the Dome Water Monitoring Instrumentation System, or DWMIS) monitors and records dame-water parameters such as salinity, conductivity, pH, temperature, dissolved oxygen, and galvanic potential periodically each day to establish changes and trends. The goals of this monitoring program are to understand dome water corrosivity and how the corrosivity is affected by the exchange rates between the dome and surrounding, external seawater. The knowledge gained will be used to formulate recommendations for reducing the corrosivity of the dome water.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127128235","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

Computing ship resolution gain for horizontal towed arrays in realistic ocean environments 实际海洋环境下水平拖曳阵列舰船分辨率增益计算

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326201

D. W. Craig

引用次数: 0