2014 Oceans - St. John's最新文献_第10页

Coherence estimation for repeat-pass interferometry 重复通道干涉测量的相干估计

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003197

J. Dillon, V. Myers

{"title":"Coherence estimation for repeat-pass interferometry","authors":"J. Dillon, V. Myers","doi":"10.1109/OCEANS.2014.7003197","DOIUrl":"https://doi.org/10.1109/OCEANS.2014.7003197","url":null,"abstract":"Repeat-pass interferometry is an extension of Synthetic Aperture Sonar (SAS) that exploits the temporal characteristics of seafloor reverberation by coherently combining echoes from multiple passes of the sonar platform. In order to achieve pass-to-pass coherence, the spatial separation between passes must be less than a value known as the critical baseline, which depends on the sonar parameters and the range-dependent imaging geometry. The temporal separation between passes must also be less than the coherence time of the seabed, which is highly environmentally dependent and which defines the maximum time interval between passes. It is also necessary to coregister the complex seabed images to within a fraction of a pixel (usually on the order of several millimeters for the centimeter resolution SAS used in mine countermeasures). This imposes strict requirements on the navigation accuracy of the sonar platform that cannot be met using inertial or underwater positioning sensors alone. This paper presents a data-driven method for estimating the repeat-pass coherence map using local coregistration of the complex SAS images from each pass. The method can be applied to any SAS without requiring access to raw acoustic data or post-processing of data from a high grade inertial navigation system. Experimental results are presented for a repeat-pass survey using AquaPix, a wideband 300 kHz interferometric SAS, installed on an ISE Arctic Explorer AUV during recent sea trials with Defence Research and Development Canada.","PeriodicalId":368693,"journal":{"name":"2014 Oceans - St. John's","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114409394","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: 9

Low-cost coastal mapping using Kinect v2 time-of-flight cameras 使用Kinect v2飞行时间相机的低成本沿海地图

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003084

T. Butkiewicz

引用次数: 80

Gliderpalooza 2013 to modelpalooza 2014: Joint U.S. & Canadian ocean glider operations supporting multidisciplinary scientific research and education 2013年滑翔机嘉年华到2014年滑翔机嘉年华:美国和加拿大海洋滑翔机联合运营，支持多学科科学研究和教育

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003124

M. Crowley, O. Schofield, S. Glenn, F. Whoriskey

{"title":"Gliderpalooza 2013 to modelpalooza 2014: Joint U.S. & Canadian ocean glider operations supporting multidisciplinary scientific research and education","authors":"M. Crowley, O. Schofield, S. Glenn, F. Whoriskey","doi":"10.1109/OCEANS.2014.7003124","DOIUrl":"https://doi.org/10.1109/OCEANS.2014.7003124","url":null,"abstract":"Gliderpalooza represented a grass-roots coordinated field demonstration of ocean observing technologies spanning the eastern seaboard of North America. The overarching goal was to coordinate disparate ocean research efforts, funded by disparate programs from a variety of agencies to demonstrate continental scale coordination of various ocean observing technologies to sample ecologically relevant scales. The coordinated data from satellites, HF-Radar surface currents [1], moorings, drifters and models was focused on and around the distributed deployment of Slocum gliders. The seven science and technical goals were to: 1) provide a unique data set the modelers can use for years to come (real-time & hindcast) 2) provide a standardized dataset over ecological scales and information on fish/mammal migrations 3) provide a 3-D snapshot of the MAB cold pool 4) provide an extensive distributed instrumented network through the peak period of fall storms, demonstrating a community \"surge\" capacity 5) provide one, of many demonstrations, of the potential U.S. national glider network 6) proof of data flow throughput to the Global Telecommunications System (GTS) via DMAC and 7) engage undergraduates in ocean observing efforts. During the summer and fall of 2014, the Gliderpalooza team will once again work together, but with several additions to the group, the geographical scope will cover Texas to Newfoundland. There will be more than 30 glider deployments that will be assimilated by seven numerical ocean models. Acquisition of this massive data set of water column profiles will permit evaluation of the accuracy of the models, especially in the coastal zone. Additionally, new online educational tools developed through the NSF's Ocean Observatory Initiative (OOI) will be used to by students in the undergraduate classroom to analyze, compare and contrast the glider data in real-time during the fall 2014 semester.","PeriodicalId":368693,"journal":{"name":"2014 Oceans - St. John's","volume":"274 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127551405","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

Modeling and operation of an interior permanent magnet motor drive for electric submersible pumps 电潜泵内置式永磁电机驱动的建模与运行

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003016

S. Rabbi, M. Rahman, S. Butt

引用次数: 8

The bottom reverberation suppression algorithm for side scan sonar 侧扫声纳底部混响抑制算法

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003052

Liu Jia, Xu Feng, Yang Juan, An Xu-dong

引用次数: 0

Effect of damping on galloping of circular cylinders 阻尼对圆柱驰动的影响

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003254

E. M. Garcia, C. Chang, Hongrae Park, M. Bernitsas

引用次数: 0

Multibeam echosounder calibration with split-aperture transmission 分孔径传输多波束测深仪标定

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003280

C. D. de Moustier, P. Fox, R. Huxtable, J. C. Peterson

{"title":"Multibeam echosounder calibration with split-aperture transmission","authors":"C. D. de Moustier, P. Fox, R. Huxtable, J. C. Peterson","doi":"10.1109/OCEANS.2014.7003280","DOIUrl":"https://doi.org/10.1109/OCEANS.2014.7003280","url":null,"abstract":"Results are described for a multibeam echosounder calibration experiment in which the elevation angle of a standard spherical target was estimated using a split aperture geometry on the transmit array. This is an extension of the two transmitters - one receiver concept described by Messer et al. (IEEE TAES 32-3, 1158-1164, 1996). Here, three transmitters and one receiver were used to obtain elevation angle estimates from the difference in time delays or phase delays across each baseline. The tests were conducted from a barge at dockside in about 10 m of water depth. A 500-kHz multibeam echosounder was mounted on a pan and tilt unit and deployed at the end of a pole. The tests were done using a standard tungsten-carbide sphere, 38.1 mm in diameter, suspended on a monofilament nylon line, in the far field of the transducer arrays vertically below the sonar head. Quasi-orthogonal linearly frequency modulated pulses with about 96 kHz bandwidth were transmitted in pairs (downchirp then upchirp) from each baseline. When the target remains stationary relative to the sonar for the duration of a ping pair cycle (<;0.1 s) elevation angles estimates were self-consistent within ±0.2° for the time delay method as well as for the phase delay method. Results of the two methods agreed to within 0.2° -0.3°.","PeriodicalId":368693,"journal":{"name":"2014 Oceans - St. John's","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126090877","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

Comparison of spectral estimation methods for current estimation by an HF surface wave radar 高频表面波雷达电流估计的频谱估计方法比较

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003001

Wen Wang, E. Gill

引用次数: 2

Low probability of detection for underwater acoustic communication 水声通信的探测概率低

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003005

R. Diamant, L. Lampe, E. Gamroth

引用次数: 5

Localization of impulsive sources in the ocean using the method of images 基于图像的海洋脉冲源定位方法

2014 Oceans - St. John's Pub Date : 2014-09-01 DOI: 10.1109/OCEANS.2014.7003175

Too Yuen Min, M. Chitre

{"title":"Localization of impulsive sources in the ocean using the method of images","authors":"Too Yuen Min, M. Chitre","doi":"10.1109/OCEANS.2014.7003175","DOIUrl":"https://doi.org/10.1109/OCEANS.2014.7003175","url":null,"abstract":"Impulsive transient signals produced by snapping shrimp dominate the high frequency ambient noise in warm shallow waters. A receiver not only observes the direct arrival of the snap from the shrimp, but also multipath reflections from scattering boundaries such as the sea surface, seabed, etc. We formulate a geometric model corresponding to one direct arrival and one surface reflection. The originating location of a snap can be extracted from the model if the exact position of each element in the receiver array is known. In practice, we only have coarse prior knowledge of the array depth and orientation, and the exact array element locations have to be estimated. The situation is further complicated by the fact that many snaps occur concurrently, and associating a snap with its reflection is a nontrivial problem. We use least logarithmic absolute (LLA) criteria to explore the unknown parameter in this joint estimation and association problem. The association can be further refined based on the complete geometric model. We outline our method and present a numerical simulation to test the performance of the estimator. Results from a dataset collected in Singapore waters using a broadband small-aperture phased array are illustrated. We compare the results with previous findings, demonstrating that accurate passive localization of known structures in the ocean using natural noise made by snapping shrimp inhabiting the structures can be achieved.","PeriodicalId":368693,"journal":{"name":"2014 Oceans - St. John's","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125788535","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: 5