Proceedings of OCEANS '93最新文献_第3页

Using neural nets to identify marine mammals 用神经网络来识别海洋哺乳动物

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326169

I.J. Booth, K. Booth

引用次数: 3

Passive damping to attenuate snap loading on a ROV umbilical cable 被动阻尼可以减弱ROV脐带电缆上的瞬时载荷

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.325968

R. Driscoll, L. Iggins

引用次数: 1

Evaluation of an ADCP fish-bias rejection algorithm 一种ADCP鱼偏差抑制算法的评价

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326127

H. Freitag, P.E. Plimpton, M. Mcphaden

{"title":"Evaluation of an ADCP fish-bias rejection algorithm","authors":"H. Freitag, P.E. Plimpton, M. Mcphaden","doi":"10.1109/OCEANS.1993.326127","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326127","url":null,"abstract":"Downward-looking surface-moored Acoustic Doppler Current Profiler (ADCP) data is at times biased towards lower values when compared to mechanical current meters (MCM). This bias has been shown to be caused by the attraction of large pelagic fish to surface moorings. RD Instruments ADCPs have an optional algorithm which attempts to limit velocity bias due to fish. The algorithm compares echo intensity amplitude among the four beams of the instrument and rejects samples in which the highest and lowest echo intensity amplitude differ by more than a given level. The performance of the algorithm was evaluated at deployments in the eastern and western equatorial Pacific. Bias was found to be reduced in some cases, but remained in others. The cause of residual bias is shown to be the presence of fish in all four acoustic beams-a condition not considered by the algorithm. A post-processing method of correcting fish bias in ADCP velocity data is presented. The method involved computing vertical modes of the bias from ADCP-MCM differences using empirical orthogonal functions (EOFs). The vertical structure of the EOFs was interpolated to the higher vertical resolution of the ADCP and then applied as a correction to the ADCP data. The quality of ADCP data was significantly improved by this correction.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"4 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":"121179221","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

A model for simulating currents in eastern Juan de Fuca Strait and and the southern Strait of Georgia 模拟胡安·德·富卡海峡东部和乔治亚海峡南部洋流的模式

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.325987

M. Foreman, R. Walters, R. Henry

引用次数: 7

Application of high-resolution beamforming to multibeam swath bathymetry 高分辨率波束形成在多波束条测深中的应用

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326070

D. Pantzartzis, C. D. de Moustier, D. Alexandrou

引用次数: 9

Performance limitations on travel time and phase data extraction for bathymetry side-scan sonars 测深侧扫声纳行程时间和相位数据提取的性能限制

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326069

J. Sun, R. Tyce

引用次数: 1

Statistical properties of horizontal, vertical and omnidirectional underwater noise fields at low frequency 低频水平、垂直和全向水下噪声场的统计特性

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326199

M. Wilmut, N. Chapman, S. Anderson

引用次数: 3

Simplified dynamics and stochastic controller for underwater robots 水下机器人的简化动力学与随机控制器

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326113

B. Lévesque, M. Richard

引用次数: 4

High rate shallow water acoustic communication 高速率浅水水声通信

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326228

A. Zielinski, R. Coates, L. Wang, A. Saleh

引用次数: 17

Test and evaluation of a midwater three dimensional underwater tracking array 一种中水三维水下跟踪阵列的试验与评价

Proceedings of OCEANS '93 Pub Date : 1993-10-18 DOI: 10.1109/OCEANS.1993.326145

W. Venezia, J.N. Aycock

{"title":"Test and evaluation of a midwater three dimensional underwater tracking array","authors":"W. Venezia, J.N. Aycock","doi":"10.1109/OCEANS.1993.326145","DOIUrl":"https://doi.org/10.1109/OCEANS.1993.326145","url":null,"abstract":"A continuing need exists for accurate three dimensional tracking of submerged targets on instrument ranges. The common problems faced by developers of acoustic underwater tracking systems range from launch, recovery, and structure life to telemetry and real time processing of source signals. The Naval Surface Warfare Center controls an underwater test site that ranges from shore to a water depth of 600 meters. To support long term growth, an underwater tracking system capable of operating over the majority of the range with a serviceable life of twenty years was developed and is described. The system design goals included long term compatibility with the marine environment and stringent tracking accuracy requirements. Environmentally compatible materials selection included fiber reinforced plastics for structures, glass spheres for pressure vessels, and titanium for fasteners. Tracking accuracy is achieved using a synchronous tracking system consisting of four hydrophones on an eight meter baseline. Pulse detection and arrival time are determined using a combination of in band and out of band energy detection with replica correlation of the apex channel. The system has single bit digitizing using zero crossing detectors. Differential arrival times for two adjacent channels are determined using cross correlation with the apex channel. This paper contributes an overview of the underwater tracking system and of the Fort Lauderdale facilities and test capabilities. A summary of experimentally obtained data on the tracking accuracy from deployments in 180 and 450 meters is given. Tracking resolutions are given as a function of environmental parameters including range from the array, depth, and ambient sound velocity profiles. Array performance characteristics are extrapolated over usable water depth based on evaluation of the arrays at the two test sites.<<ETX>>","PeriodicalId":130255,"journal":{"name":"Proceedings of OCEANS '93","volume":"45 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":"132421691","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: 0