Oceans '97. MTS/IEEE Conference Proceedings最新文献

Ocean waveguide effects on acoustic and seismic ULF propagation 海洋波导对声波和地震极低频波传播的影响

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634431

M. Nardin, F. Glangeaud, J.M. Vanpe, R. Ancey, P. Pignot, L. Royer, S. Gafet

引用次数: 1

An electronic navigational aid for pilots-designed by pilots 为飞行员设计的电子导航设备

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624219

D. Phinney

{"title":"An electronic navigational aid for pilots-designed by pilots","authors":"D. Phinney","doi":"10.1109/OCEANS.1997.624219","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.624219","url":null,"abstract":"Summary form only given, substantially as follows. There have been significant advances in wireless communications as well as increased utilization of the Global Positioning System (GPS) for commercial navigation systems. A major component in maritime applications of these technologies is a portable shipboard system that provides more that own-ship position. In addition to their own ship, users want to see local electronic charts, real-time situational information on other vessel traffic, transit schedule updates, waterway conditions, etc. With the ability to see around corners, call up information on other vessels, check currents or tidal conditions, and receive other voiceless vessel traffic services information, pilots will have a situational awareness that can directly enhance safety and reduce transit delays. The Center for Navigation at the Volpe Center has developed an advanced electronics navigational aid for use by pilots on the Panama Canal. The primary objective of this project is to provide Panama Canal pilots with a platform for evaluating new features, defining requirements for an operational system, and gaining GPS navigational experience. This paper discusses some of the preliminary results of the design and development stage of a prototype system that has been operating in the Canal for six months, and describes capabilities described as most useful by the pilots.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115608844","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

A remotely operated 6020-meter seafloor corer 远程操作的6020米海底覆盖装置

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634356

R. Petters, Y. Asakawa

引用次数: 2

Real-time bathymetric artifact flagging for the SeaBeam 2100 system SeaBeam 2100系统的实时测深信号

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624117

S.E. Spitzak, K. Talukdar

引用次数: 0

The design and testing of a free-fall device for recording seismic activity beneath the ocean floor 自由落体装置的设计和测试，用于记录海底地震活动

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624213

J.C. Jones, A. Di Meglio, R. Coates, P. Atkins

{"title":"The design and testing of a free-fall device for recording seismic activity beneath the ocean floor","authors":"J.C. Jones, A. Di Meglio, R. Coates, P. Atkins","doi":"10.1109/OCEANS.1997.624213","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.624213","url":null,"abstract":"For the last thirty years ocean bottom seismometers (OBSs) have been used to survey the oceans. However, the quality of the data they produce is often degraded due to poor coupling or high levels of ambient noise. In contrast, sensors placed beneath the seafloor avoid many of these problems. For the last two decades burials have relied on Ocean Drilling Program (ODP) boreholes. This approach is expensive and demands numerous human resources. In addition, the locations of these boreholes, determined by the ODP, are rarely desirable for monitoring seismic activity. In this paper a sub-bottom seismic acquisition system is presented that uses free-fall devices, or deep ocean seismic penetrators (DOSP), to place sensors several tens of metres beneath the seafloor. The DOSPs weigh approximately 1800 kg, achieve terminal velocities between 30-50 m/s and penetrate to depths of 20-30 metres in soft sea sediments. Once buried, they record seismic activity and transmit data back to the surface using a frequency shift keyed (FSK) modulation technique. The results of an experiment conducted in the Mediterranean using this system are presented. These confirm the predicted dynamic and kinematic behaviour of the DOSP and allow an assessment of the ambient seismic noise level at a depth of /spl ap/30 metres beneath the seafloor. In conclusion this paper discusses the potential use of free-fall devices to increase our understanding of processes in the deep oceans, with particular emphasis on their applicability to future deep ocean seismology.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117347684","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

The design and testing of a DSP, half-duplex, vertical, DPSK communication link 设计并测试了一种DSP、半双工、垂直、DPSK通信链路

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634372

J.C. Jones, A. Di Meglio, L.S. Wang, R. Coates, A. Tedeschi, R. Stoner

{"title":"The design and testing of a DSP, half-duplex, vertical, DPSK communication link","authors":"J.C. Jones, A. Di Meglio, L.S. Wang, R. Coates, A. Tedeschi, R. Stoner","doi":"10.1109/OCEANS.1997.634372","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.634372","url":null,"abstract":"Accurate in-situ studies of the oceans requires an efficient, fast and reliable method of transmitting information to and from dedicated scientific payloads. The current generation of underwater telemetry systems tend to use proven, low data rate, 'discrete-component' designs. Although these systems perform well in static environments, their performance rapidly degenerates when the environment becomes more dynamic. The next generation of underwater telemetry systems must be able to adapt automatically to the changing environment and counteract time-varying effects by means of flexible signal processing techniques and detection algorithms. This goal is hard, if not impossible, to realise using conventional 'discrete component' designs. This paper presents a vertical communication system that uses an 'Analogue Devices' digital signal processor (DSP) at its heart. This DSP controls the transmission of data and operative commands to and from a seafloor unit, using multi-phase, 2, 4 or 8, differential phase shift keying (DPSK). This system is considered to be the first step towards a completely autonomous, adaptive communications system.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121369842","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

Non-linear tanker control system parameter optimisation using genetic algorithms 基于遗传算法的非线性油轮控制系统参数优化

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634328

E. McGookin, D. Murray-Smith, Yun Li, T. Fossen

引用次数: 4

Submersible pop-up buoy for RF communication 用于射频通信的潜水式弹出式浮标

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634359

W.R. Macha, K. Rogers

{"title":"Submersible pop-up buoy for RF communication","authors":"W.R. Macha, K. Rogers","doi":"10.1109/OCEANS.1997.634359","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.634359","url":null,"abstract":"Buoy geometries for ocean applications are as varied and diverse as the programs that give rise to their needs. NRaD is designing for ONR an autonomous, battery-powered, pop-up buoy system to provide RF communications between the sea surface and a remote ship or shore terminus, or an airborne or spaceborne repeater. This buoy system will act as a communication relay, sending and receiving data over an RF link, and shuttling that information, via fiber-optic link, to and from a sensor system on the ocean floor. Unique design features include an inherently positive, variable-displacement spar; a variable-ballast chamber to regulate surface exposure; and a self-compensating tether-management/counterbalance system. Four micro-controllers distributed throughout the buoy system control all buoy parameters. An innovative antenna configuration combines several transmit and receive antennas in a smooth mast, which will reduce drag and snagging. Onboard engineering sensors will collect and store voltages, currents, pitch, roll, temperature, and other buoy performance data on a regular basis while the spar is submerged, and will send that information to the user when RF communication is established. Safety features include backup acoustic commands to the buoy and a GPS locator/beacon that will detect and report the spar's position should it break away from its mooring.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126096847","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

The drifting, rotating deep-ocean shearmeter 漂流、旋转的深海测速仪

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624095

T. Duda, D. Webb

引用次数: 4

Observations of the spatial structure of internal waves in a small mid-latitude lake 一个中纬度小湖泊内波空间结构的观测

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634368

B. Laval, J. Bird, P. D. Helland

{"title":"Observations of the spatial structure of internal waves in a small mid-latitude lake","authors":"B. Laval, J. Bird, P. D. Helland","doi":"10.1109/OCEANS.1997.634368","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.634368","url":null,"abstract":"Internal waves are features of stratified waters that vary in space and time. Traditionally, such features have been investigated using data accumulated by an array of self-recording sensors. There are typically one or more moorings located in a study area, with each mooring having sensors located at several different depths. While the temporal resolution of data logged by each sensor is excellent, the spatial resolution of data recorded by such a system of sensors is usually poor. Having a sensor move through the water column is one way of improving the spatial resolution of data, but such data tends to have poor temporal resolution at any given location. With the goal of obtaining data with adequate spatial and temporal resolution to characterise internal waves, a study was undertaken that combines the temporal resolution provided by a traditional moored sensor array, with the spatial resolution of data collected by sensors moving across the study area. This study was conducted at Loon Lake, which is a small (1.5 km long and 0.5 km wide), deep (/spl sim/50 m) lake located near Maple Ridge, British Columbia, Canada. Direct measurements of the temperature structure within the thermocline were made with moored thermistor chains, as well as with a thermistor mounted on an autonomous underwater vehicle, or AUV. Two thermistor chains, each with six thermistors within the thermocline, were moored along the major axis of the lake for six weeks. A SeaBird SBE19 CTD was mounted onboard the Underwater Research Lab's PURLII AUV. On three separate days PURLII followed a sawtooth pattern within the thermocline, and along the major axis of the lake. These data were compared and contrasted to provide a comprehensive description of the internal temperature field.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126776618","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