Pub Date : 1993-10-18DOI: 10.1109/OCEANS.1993.326203
V. Hesany, R. Moore, S. Haimov
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.<>
{"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}
Pub Date : 1993-10-18DOI: 10.1109/OCEANS.1993.326123
H. Wong, A. Antoniou
The application of 2D signal processing to profiles collected in airborne laser bathymetry is investigated. The processing involves a type of 2D filtering for the suppression of impulsive noise and the application of a sophisticated 2D interpolation technique for the reconstruction of bathymetric data. The reconstructed profiles are further enhanced by two adaptive procedures: one involves 2D power spectral analysis of the data on a block-by-block basis and the other concerns the estimation of the data on a point-by-point basis. Results show that each type of filtering enhances the accuracy of bathymetric measurement quite significantly.<>
{"title":"Reconstruction and enhancement of sea-bed topography by using 2-D signal processing","authors":"H. Wong, A. Antoniou","doi":"10.1109/OCEANS.1993.326123","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326123","url":null,"abstract":"The application of 2D signal processing to profiles collected in airborne laser bathymetry is investigated. The processing involves a type of 2D filtering for the suppression of impulsive noise and the application of a sophisticated 2D interpolation technique for the reconstruction of bathymetric data. The reconstructed profiles are further enhanced by two adaptive procedures: one involves 2D power spectral analysis of the data on a block-by-block basis and the other concerns the estimation of the data on a point-by-point basis. Results show that each type of filtering enhances the accuracy of bathymetric measurement quite significantly.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"34 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":"130363039","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 : 1993-10-18DOI: 10.1109/OCEANS.1993.326090
Li Ding, D. Farmer
New observations of breaking surface waves have recently been acquired with a novel acoustic instrument during the Surface Wave Processes Program. Several breaking wave parameters have been measured. This paper focuses on breaking scale, breaking probability, and radiated acoustic power from breaking waves. The breaking scale is derived from the travel speed of breaking waves. It is found that the mean scale is 46%-75% of the dominant wave phase speed, and that the radiated acoustic power is well correlated with the mean scale. The breaking probability is found to be consistent with a linear statistical model. Potential application of these results in estimating wave energy dissipation is discussed.<>
{"title":"Passive acoustical measurements of scale, probability, and intensity of wave breaking","authors":"Li Ding, D. Farmer","doi":"10.1109/OCEANS.1993.326090","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326090","url":null,"abstract":"New observations of breaking surface waves have recently been acquired with a novel acoustic instrument during the Surface Wave Processes Program. Several breaking wave parameters have been measured. This paper focuses on breaking scale, breaking probability, and radiated acoustic power from breaking waves. The breaking scale is derived from the travel speed of breaking waves. It is found that the mean scale is 46%-75% of the dominant wave phase speed, and that the radiated acoustic power is well correlated with the mean scale. The breaking probability is found to be consistent with a linear statistical model. Potential application of these results in estimating wave energy dissipation is discussed.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"28 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":"130538737","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 : 1993-10-18DOI: 10.1109/OCEANS.1993.326122
E. Maturi, W. Pichel
A cloud mask program is available for masking out all clouds present on CoastWatch satellite imagery products. CoastWatch satellite imagery are operational NOAA polar-satellite 1 km Advanced Very High Resolution Radiometer (AVHRR) data that are remapped for designated U.S. coastal regions. Sea surface temperature imagery is one of the current CoastWatch products; however, the product contains cloudy pixels. A cloud mask product is necessary to determine cloud free areas for sea surface temperature identification. The Clouds from AVHRR (CLAVR) cloud detection algorithm is being tested on both day and night AVHRR imagery. An explanation of the cloud masking tests and examples of their application to the analysis of sea surface temperature imagery for the coastal U.S. on a near-real time basis are presented.<>
{"title":"Cloud masking for CoastWatch satellite imagery","authors":"E. Maturi, W. Pichel","doi":"10.1109/OCEANS.1993.326122","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326122","url":null,"abstract":"A cloud mask program is available for masking out all clouds present on CoastWatch satellite imagery products. CoastWatch satellite imagery are operational NOAA polar-satellite 1 km Advanced Very High Resolution Radiometer (AVHRR) data that are remapped for designated U.S. coastal regions. Sea surface temperature imagery is one of the current CoastWatch products; however, the product contains cloudy pixels. A cloud mask product is necessary to determine cloud free areas for sea surface temperature identification. The Clouds from AVHRR (CLAVR) cloud detection algorithm is being tested on both day and night AVHRR imagery. An explanation of the cloud masking tests and examples of their application to the analysis of sea surface temperature imagery for the coastal U.S. on a near-real time basis are presented.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"1 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":"130954161","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 : 1993-10-18DOI: 10.1109/OCEANS.1993.326197
I. Yamamoto, Y. Terada, T. Nagamatu, Y. Imaizumi
The purpose of this paper is to describe the feasibility research on an oscillating fin propulsion control system as a vehicle actuator. The system was designed and constructed in order to be combined with ship models. Tank cruising tests were conducted to confirm the system's feasibility. As a result, several advantages were found. The effectiveness of a neural network was successfully proven for an advanced control system.<>
{"title":"Research on an oscillating fin propulsion control system","authors":"I. Yamamoto, Y. Terada, T. Nagamatu, Y. Imaizumi","doi":"10.1109/OCEANS.1993.326197","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326197","url":null,"abstract":"The purpose of this paper is to describe the feasibility research on an oscillating fin propulsion control system as a vehicle actuator. The system was designed and constructed in order to be combined with ship models. Tank cruising tests were conducted to confirm the system's feasibility. As a result, several advantages were found. The effectiveness of a neural network was successfully proven for an advanced control system.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"11 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":"124642244","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 : 1993-10-18DOI: 10.1109/OCEANS.1993.326001
P. Mikhalevsky, R. Muench, A. Baggeroer
Several climate models suggest that the Arctic Ocean may be one of the more sensitive indicators of global climate change. In addition to changes in the Arctic Ocean temperature, the ice pack will also respond to these changes; for example, its mean thickness, roughness and the percentage of open water will all be modulated. Low frequency acoustic propagation in the Arctic is strongly influenced by the ice pack properties since the SOFAR axis is at or near the surface. In addition to the travel time and phase changes that could be observed due to changes in the Arctic Ocean temperature; phase and amplitude coherence, travel times, transmission losses, modal coupling are just a few of the observables which would respond to changes in the pack ice. Current understanding as well as future work and possibilities for acoustic thermometry of Arctic Ocean climate are reviewed.<>
{"title":"Acoustic thermometry for Arctic Ocean climate","authors":"P. Mikhalevsky, R. Muench, A. Baggeroer","doi":"10.1109/OCEANS.1993.326001","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326001","url":null,"abstract":"Several climate models suggest that the Arctic Ocean may be one of the more sensitive indicators of global climate change. In addition to changes in the Arctic Ocean temperature, the ice pack will also respond to these changes; for example, its mean thickness, roughness and the percentage of open water will all be modulated. Low frequency acoustic propagation in the Arctic is strongly influenced by the ice pack properties since the SOFAR axis is at or near the surface. In addition to the travel time and phase changes that could be observed due to changes in the Arctic Ocean temperature; phase and amplitude coherence, travel times, transmission losses, modal coupling are just a few of the observables which would respond to changes in the pack ice. Current understanding as well as future work and possibilities for acoustic thermometry of Arctic Ocean climate are reviewed.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"14 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":"128104495","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 : 1993-10-18DOI: 10.1109/OCEANS.1993.326131
J. Andres, S. Jefferies, G. Gillenwaters
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.<>
{"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}
Pub Date : 1993-10-18DOI: 10.1109/OCEANS.1993.326237
F. Hover
The concept of dynamic positioning for deeply-towed cables and pipes is considered experimentally, using a laboratory scale model and several well-known design techniques. Applications include ROV operations where a clump weight or heavy steel cable is used, and the mating of drillpipes with subsea assemblies. An important factor is that actuation is only available at the top end, and position measurement is available only at either end.<>
{"title":"Experiments in dynamic positioning of a towed pipe","authors":"F. Hover","doi":"10.1109/OCEANS.1993.326237","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326237","url":null,"abstract":"The concept of dynamic positioning for deeply-towed cables and pipes is considered experimentally, using a laboratory scale model and several well-known design techniques. Applications include ROV operations where a clump weight or heavy steel cable is used, and the mating of drillpipes with subsea assemblies. An important factor is that actuation is only available at the top end, and position measurement is available only at either end.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"31 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":"127747046","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 : 1993-10-18DOI: 10.1109/OCEANS.1993.326045
C. Sandwith, R.L. Ruedisueli, K. Booth, J.P. Papageorge, B. Eng
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.<>
华盛顿大学应用物理实验室(APL-UW)和海军海上系统司令部(NAVSEA)参与了一项减少潜艇声纳圆顶腐蚀的长期研究。除了定期检查瓦状圆顶的结构，并对其设计、材料和维护提出改进建议外，APLUW最近还开发了一个仪器包，用于监测圆顶水的选定参数。在此之前，穹顶水腐蚀分析结合了三个来源的信息:穹顶泵出时收集的水样、码头测量以及穹顶中典型材料的电化学腐蚀速率的实验室测试。使用此程序，圆顶水样仅在运行周期的终点获得，即在巡逻之前和之后的维护期间。新的仪器包(称为Dome Water Monitoring Instrumentation System，简称DWMIS)每天定期监测和记录Dome - Water参数，如盐度、电导率、pH值、温度、溶解氧和电势，以确定变化和趋势。该监测项目的目标是了解穹顶水的腐蚀性，以及穹顶与周围外部海水之间的交换率如何影响腐蚀性。所获得的知识将用于制定降低穹顶水腐蚀性的建议
{"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}
Pub Date : 1993-10-18DOI: 10.1109/OCEANS.1993.326201
D. W. Craig
Previous experimental measurements of beam noise have shown that spectrum levels measured with towed line arrays have considerable temporal and spatial variability. In the ambient noise region dominated by shipping noise (a few Hz to a few hundred Hz), variations in spectral levels of over 30 dB can occur. Attempts to model the predicted beam noise cumulative distribution function (R.M. Heitmeyer, L.T. Davis and N. Yen, NRL Report 8863, February 1985) required approximations for both the beam pattern and transmission loss to achieve an analytic solution. The computed detection gain in regions of reduced noise resulting from resolution of individual noise-interferers, termed "ship resolution gain" (SRG), is dependent on source distribution, acoustic transmission loss and beam pattern approximation. The paper uses numerical computation of SRG to treat arbitrary hydrophone shading and realistic ocean environments. Results are compared to earlier analytic predictions to show dependence on system and environmental parameters.<>
{"title":"Computing ship resolution gain for horizontal towed arrays in realistic ocean environments","authors":"D. W. Craig","doi":"10.1109/OCEANS.1993.326201","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326201","url":null,"abstract":"Previous experimental measurements of beam noise have shown that spectrum levels measured with towed line arrays have considerable temporal and spatial variability. In the ambient noise region dominated by shipping noise (a few Hz to a few hundred Hz), variations in spectral levels of over 30 dB can occur. Attempts to model the predicted beam noise cumulative distribution function (R.M. Heitmeyer, L.T. Davis and N. Yen, NRL Report 8863, February 1985) required approximations for both the beam pattern and transmission loss to achieve an analytic solution. The computed detection gain in regions of reduced noise resulting from resolution of individual noise-interferers, termed \"ship resolution gain\" (SRG), is dependent on source distribution, acoustic transmission loss and beam pattern approximation. The paper uses numerical computation of SRG to treat arbitrary hydrophone shading and realistic ocean environments. Results are compared to earlier analytic predictions to show dependence on system and environmental parameters.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"3 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114023843","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：