Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)最新文献

{"title":"Optimum design on time domain wideband beamformer with constant beamwidth for sonar systems","authors":"Jiansheng Tang, Chao Sun, Yixin Yang, Jie Zhuo","doi":"10.1109/OCEANS.2004.1405487","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1405487","url":null,"abstract":"In this paper, a new method is presented to design low-sidelobe wideband constant beamwidth beamformers (WCBB) in time domain, which alleviates the effect caused by array mismatch errors by applying the measured array models into the design procedure. A combination of FIR filters and digital delay lines is used in the beamformer structure to reduce the order of FIR filters. In FIR filter design, the semi-definite programming is utilized which is able to constrain both the mainlobe shapes and the sidelobe levels within the whole design frequency band. Results from lake experiments with a practical sonar system verified the effectiveness of the proposed method.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114802698","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}

{"title":"An analytic solution of steady Stokes flow on a rotating spherical cap","authors":"H. Kitauchi, H. Simmons, M. Ikeda","doi":"10.1109/OCEANS.2004.1406346","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1406346","url":null,"abstract":"An analytic solution of two-dimensional steady, linear, viscous flow on a spherical cap - the region of a sphere which lies above (or below) a given plane - rotating about its center is obtained. An inflow and an outflow on the boundary of the spherical section drive the fluid motion. The solution of the stream function is expressed as the Fourier series in longitude and the first-kind associated Legendre functions of complex degrees in cosine of colatitude. The results support the previous study on the approximation analysis and laboratory experiment","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117114191","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}

{"title":"Beam patterns of an underwater acoustic vector hydrophone located near a reflecting boundary","authors":"H. Keshavarz","doi":"10.1109/OCEANS.2004.1405463","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1405463","url":null,"abstract":"A vector hydrophone consists of two or three spatially collocated but orthogonally oriented velocity hydrophones plus an optional collocated pressure hydrophone. A vector hydrophone may form azimuth-elevation beams that are invariant with respect to the source frequencies, bandwidths and radial location (in the near field or the far field). This paper characterizes the spatial matched filter beam patterns (i.e. fixed or conventional or maximum signal-to-noise ratio beam patterns) associated with a single underwater acoustic vector hydrophone located near a reflecting boundary. Furthermore, the beam pattern's main peak deviation is investigated for different constructions.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124833989","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}

{"title":"Neptune: a hil simulator for multiple UUVs","authors":"P. Ridao, E. Batlle, D. Ribas, M. Carreras","doi":"10.1109/OCEANS.2004.1402970","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1402970","url":null,"abstract":"This paper overviews the field of graphical simulators used for AUV development, presents the taxonomy of these applications and proposes a classification. It also presents Neptune, a multivehicle, real-time, graphical simulator based on OpenGL that allows hardware in the loop simulations.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125043616","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}

{"title":"New proposal of evaluation method for cargo handling efficiency on mega float container terminal facility","authors":"Y. Sukeyasu, S. Shiraishi, N. Nagatomi, A. Nitta, M. Ohta, S. Inoue","doi":"10.1109/OCEANS.2004.1405659","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1405659","url":null,"abstract":"The Japanese government is developing its logistical capacity of international hub port in order to improve Japan's global economic competitiveness. One of the most important issues is to develop international container terminal network. However, since it is expected that coming aging society would give some limitation to spending share for the projects which are strongly required, the reduction of construction cost is urgent task. Inland sea area, which is often characterized by deep soft-ground and deep sea, generally tends to be preferred as container terminal site, because its calm oceanographic condition could guarantee cargo-handling efficiency on container terminal, however we often find that deep soft-ground and deep of inland sea become significant obstacles to realize the projects, because they are cost spending factors in the construction. Although construction engineering is highly improved for conventional facility i.e. the facility with fixed type structure, an application of floating type structure could be a useful substitute to reduce the construction cost due the removal of expensive foundation. Instead, container terminal as well as vessel are always subjected to sea wave motion, so that successful application of floating type structure needs to assure its cargo-handling efficiency, which is preferably more than or equal to that of conventional facility. The authors proposed a method to evaluate cargo-handling efficiency, including the operationality of the crane, in relative oscillation between vessel and MFCT, i.e. mega float container terminal meaning floating type container terminal. The proposal was based on the extensive utilization of the existing criteria, i.e. allowable oscillations of vessel and related facility, which guarantee approximately 100% cargo-handling efficiency and comfortable operationality on fixed type quay wall. Computing simulation showed that the influence of the cargo motion due to the terminal oscillation was significantly small enough to sustain cargo-handling efficiency. Moreover the operationality represented by the dwelling comfortability in operation room was also investigated by comparative study between the obtained simulation results and the related standards.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121536943","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}

{"title":"Model tests of ocean nutrient enhancer \"TAKUMI\" in deep-sea basin","authors":"K. Maeda, K. Tamura, K. Kokubun, Y. Ohkawa, R. Takai, K. Shintomi","doi":"10.1109/OCEANS.2004.1402937","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1402937","url":null,"abstract":"Ocean nutrient enhancer \"TAKUMI\" is a SPAR type floating structure with a riser pipe with a diameter of 1m, and a length of 175m. By pumping up the deep ocean water containing rich nutrient salt, and sprinkling near the sea surface, plankton is made to increase and it aims at forming a good fishing ground. \"TAKUMI\" was installed in the Sagami Bay in May 2003 and is also working now. Previous to set up, two kinds of model tests were carried out in the deep-sea basin of National Maritime Research Institute for the performance check. One of the model tests is the enforced oscillation test of a riser model and the other is a test that investigates the response of the whole floating structure in regular waves, irregular waves and current. In this paper, the results of both tests are shown. With the frequency of oscillation, a riser pipe exercises at circular motion or for the form of the figure of 8. Although both results show good coincidence, the position of a node of the enforced oscillation test moves upper a little. About a hull motion and the occurrence frequency of strain, comparison between the result in the actual floating structure and model test was performed.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"232 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124291422","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}

{"title":"An integrated approach to U.S. Navy shipboard navigation","authors":"S. Murphy","doi":"10.1109/OCEANS.2004.1405553","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1405553","url":null,"abstract":"This paper explores how a state-of-the-art integrated shipboard navigation system significantly supports the U.S. Navy's effort to consolidate resources, reduce manning, and eliminate isolated systems aboard its ships. The Space and Naval Warfare Systems Command and Space and Naval Warfare Systems Center, San Diego has embarked on a spiral development and shipboard installation of the Navigation Sensor System Interface (NAVSSI) to meet this need. NAVSSI collects, processes, integrates, and distributes navigation data and precise time to weapon systems, combat support system, C4ISR systems, and other information systems users. The integration philosophy of NAVSSI has been one of continued growth towards a single source of navigation for a platform. NAVSSI analyzes multiple sources of data from a variety of sensors such as a Global Positioning System (GPS) receiver and the ship's Inertial Navigation System (INS) and integrates that data into a near optimal navigation solution. These data are distributed to shipboard user systems by a combination of point-to-point and local area network connections. Discussions here covers how the integration of navigation sensors such as a standardized GPS receiver reduces logistics requirements, saves extensive efforts in repeated topside design, more readily incorporates emerging technologies (multichannel receivers, AntiJam antennas, etc.), and reduces design efforts and costs. Examples would be given from at sea tests that show how the integration of ship sensors in NAVSSI provide a more accurate and robust solution to current position than any particular sensor alone could do. As a result, an integrated shipboard navigation system such as NAVSSI is able to distribute a common navigation and time solution to modern weapons and combat support systems with the precise accuracy that is critical in maintaining the war-fighting edge.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125183797","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}

{"title":"Acoustic camera image mosaicing and super-resolution","authors":"K. Kim, N. Neretti, N. Intrator","doi":"10.1109/OCEANS.2004.1405500","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1405500","url":null,"abstract":"This paper presents an algorithm for image registration and mosaicing on video sequences acquired by an underwater acoustic camera. The sonar images of our interest can be characterized by a high noise level, inhomogeneous illumination and low frame rate. Imaging geometry of acoustic cameras is significantly different from that of pinhole cameras. For a planar surface viewed through a pinhole camera undergoing translational and rotational motion, registration can be obtained via a projective transformation. We show that, under the same condition, an affine transformation is a good approximation for an acoustic camera. We introduce image fusion algorithms which reduce the geometrical distortions which are caused by sharp camera movement. This reduces image blur and increases image resolution.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129971790","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}

{"title":"An integrated navigation system for autonomous underwater vehicles with two range sonars, inertial sensors and Doppler velocity log","authors":"P.M. Lee, B. Jeon, S.M. Kim, H.T. Choi, C. Lee, T. Aoki, T. Hyakudome","doi":"10.1109/OCEANS.2004.1406359","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1406359","url":null,"abstract":"This work presents an integrated navigation system for autonomous underwater vehicles with inertial and acoustic sensors. The integrated navigation system is based on a strap-down inertial measurement unit (IMU), where auxiliary navigation sensors are two range sonars, a Doppler velocity log (DVL), a magnetic compass and a depth sensor. The main idea of the paper is to improve the performance of the IMU-DVL navigation system by introducing additional range information. The range sonars can measure the distance and the incident angle from a reference transponder on an underwater station. The range sonars are modeled to improve the navigation algorithm, which could provide valuable information for the IMU-DVL navigation to reduce estimation error, especially when the DVL cannot detect the bottom reflection. Simulation was conducted with the 6-d.o.f. nonlinear numerical model of an AUV in lawn-mowing survey mode at tidal flow, where the bottom reflected DVL information is unavailable. Simulations illustrate the effectiveness of the integrated navigation system assisted by the additional range measurements.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"148 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130107453","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}

{"title":"Measurement of fish school volume by multi-beam sonar. Directional resolution and estimation error","authors":"K. Iida, Yong Tang, T. Mukai, Y. Nishimori","doi":"10.1109/OCEANS.2004.1402950","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1402950","url":null,"abstract":"Multibeam sonar is very useful for estimating fish abundance because of its wide detection area. In this study, we propose a method for measuring acoustical volume for different modes of a multibeam sonar. We also tried to measure the shape and volume of a model fish school in a tank using an ultrasound scanner and then measured the shape and volume of an actual fish school in the field using semicircular scanning sonar. However, the measured shape was distorted, and an error was contained in the estimated volume of the fish school. Therefore, we used a computer simulation to consider the error in the measurement volume using a spherical scattering object under various beam widths and distances. The characteristics of the error are presented and the possibility of reducing the error was confirmed.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128058069","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}