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IEEE INFOCOM solicits research papers describing significant and innovative researchcontributions to the field of computer and data communication networks. We invite submissionson a wide range of research topics, spanning both theoretical and systems research.
OCEANS 2020 - SINGAPORE
An OCEANS conference is a major forum for scientists, engineers, and end-users throughout the world to present and discuss the latest research results, ideas, developments, and applications in all areas of oceanic science and engineering. Each conference has a specific theme chosen by the conference technical program committee. All papers presented at the conference are subsequently archived in the IEEE Xplore online database. The OCEANS conference comprises a scientific program with oral and poster presentations, and a state of the art exhibition in the field of ocean engineering and marine technology. In addition, each conference can have tutorials, workshops, panel discussions, technical tours, awards ceremonies, receptions, and other professional and social activities.
To promote awareness, understanding, advancement and application of ocean engineering and marine technology. This includes all aspects of science, engineering, and technology that address research, development, and operations pertaining to all bodies of water. This includes the creation of new capabilities and technologies from concept design through prototypes, testing, and operational systems to sense, explore, understand, develop, use, and responsibly manage natural resources.
The conference will provide a forum for discussions and presentations of advancements inknowledge, new methods and technologies relevant to industrial electronics, along with their applications and future developments.
The general scope of the conference ranges from signal and image processing to telecommunication, and applications of signal processing methods in biomedical and communication problems.
IEEE Communications Magazine was the number three most-cited journal in telecommunications and the number eighteen cited journal in electrical and electronics engineering in 2004, according to the annual Journal Citation Report (2004 edition) published by the Institute for Scientific Information. Read more at http://www.ieee.org/products/citations.html. This magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications ...
Design and analysis of algorithms, computer systems, and digital networks; methods for specifying, measuring, and modeling the performance of computers and computer systems; design of computer components, such as arithmetic units, data storage devices, and interface devices; design of reliable and testable digital devices and systems; computer networks and distributed computer systems; new computer organizations and architectures; applications of VLSI ...
Bayes procedures; buried-object detection; dielectric measurements; Doppler measurements; geomagnetism; sea floor; sea ice; sea measurements; sea surface electromagnetic scattering; seismology; sonar; acoustic tomography; underwater acoustics; and underwater radio communication.
Applications, review, and tutorial papers within the scope of the Systems, Man and Cybernetics Society. Currently, this covers: (1) Integration of the theories of communication, control cybernetics, stochastics, optimization and system structure towards the formulation of a general theory of systems; (2) Development of systems engineering technology including problem definition methods, modeling, and stimulation, methods of systems experimentation, human factors ...
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control was the number-three journal in acoustics in 2002, according to the annual Journal Citation Report (2002 edition) published by the Institute for Scientific Information. This publication focuses on the theory, design, and application on generation, transmission, and detection of bulk and surface mechanical waves; fundamental studies in physical acoustics; design of sonic ...
IEEE Journal of Oceanic Engineering, 1989
Specific methods and equipment used to modify, power, and hand-deploy AN/SSQ- 57A sonobuoys in the Arctic are discussed. The methods and suggestions can be easily extended for use with other types of sonobuoys. The modified sonobuoys transmit continuously for up to 30 days from a remote unmanned site to a manned base camp over a range of 20 km. Sample ...
OCEANS 2008, 2008
This paper explores the coherent processing of an array of GPS sonobuoys as an effective method for enhancing target tracking capabilities and improving the bearing estimation accuracy. The paper mainly focuses on underwater target detection using an array of DIFAR sonobuoys. Currently the bearing estimation of underwater targets using DIFAR sonobuoys field is based on individual element processing. However the ...
IEEE Journal of Oceanic Engineering, 2015
This paper summarizes the results of an experiment whose primary goal was to demonstrate that reliable geoacoustic inversion results can be obtained in shallow water by postprocessing acoustic data acquired by Global Positioning System (GPS)-capable sonobuoys. The experiment was conducted aboard the R/V Sharp on March 5-18, 2011 off the coast of New Jersey using AN/SSQ-53F sonobuoys with a GPS ...
IEE Colloquium on Heading Sensors for Sonar and Marine Applications, 1994
Airborne submarine warfare (ASW) relies extensively on acoustic sonobuoys to locate targets. Presently the only means of locating these buoys after deployment is a very crude radiolocation technique using the buoy VHF transmitter, and involves undesirable delays. GPS has been proposed as a means of broadcasting buoy position back to the aircraft. Conventional GPS receivers in standalone mode cannot provide ...
OCEANS 2009, 2009
The focus of military activity has recently shifted from large area engagements to regional conflicts. Consequently, supportive Naval maritime operations have continued to evolve toward littoral warfare in complicated shallow-water, near-shore environments. This evolution requires new sensors, advanced Concept of Operations, and improved data-analysis capabilities, among others. Planning operations in these harsh-environment areas is difficult because accurate predictions of tactical ...
Specific methods and equipment used to modify, power, and hand-deploy AN/SSQ- 57A sonobuoys in the Arctic are discussed. The methods and suggestions can be easily extended for use with other types of sonobuoys. The modified sonobuoys transmit continuously for up to 30 days from a remote unmanned site to a manned base camp over a range of 20 km. Sample acoustic data from the ALPIS 87 ice station are presented.<>
This paper explores the coherent processing of an array of GPS sonobuoys as an effective method for enhancing target tracking capabilities and improving the bearing estimation accuracy. The paper mainly focuses on underwater target detection using an array of DIFAR sonobuoys. Currently the bearing estimation of underwater targets using DIFAR sonobuoys field is based on individual element processing. However the low levels of signal to noise ratio (SNR) jeopardize the bearing estimation accuracy. The main factor influence the performance is imposed by the deployment strategy of DIFAR sonobuoys and is related to the inter-element distance between sonobuoys which may exceed the minimum distance requirement for array processing. Other factors are the inter-element distances changes over time as well as sonobuoys initial deployed constellation. In this research, we modified the conventional Bartellet beamforming technique in order to accommodate array processing of a group of GPS sonobuoys. Moreover the paper demonstrates the implication of employing virtual array synthesis method to eliminate the current processing limitations. The proposed methods were tested using simulated data developed for two different scenarios with different underwater environmental conditions. A comparative analysis is presented for Bartellet beamforming application on GPS sonobuoys field using current basic processing techniques versus array processing techniques based on the method proposed in this study. The results show that the proposed method is capable of enhancing the accuracy of target bearing estimation especially in cases of very low SNR. Merits and limitations of the proposed method is discussed and analyzed in this study.
This paper summarizes the results of an experiment whose primary goal was to demonstrate that reliable geoacoustic inversion results can be obtained in shallow water by postprocessing acoustic data acquired by Global Positioning System (GPS)-capable sonobuoys. The experiment was conducted aboard the R/V Sharp on March 5-18, 2011 off the coast of New Jersey using AN/SSQ-53F sonobuoys with a GPS capability as well as GPS-equipped research buoys originally developed under the Modal Mapping Experiment (MOMAX) project, which provided reliable geoacoustic information to which the sonobuoy results could be compared. It is shown that when low-frequency ( 500 Hz) continuous-wave (CW) signals are acquired on the two types of buoys in a colocated configuration, the geoacoustic models inferred from the sonobuoy data are very similar to those obtained from the MOMAX buoy data. The inversion results also compare favorably with bottom models for the region obtained from other experiments. This work is an important milestone toward achieving the ultimate goal of transitioning a basic research method to an operational scenario in which sonobuoy data are routinely used to infer geoacoustic parameters of the seabed.
Airborne submarine warfare (ASW) relies extensively on acoustic sonobuoys to locate targets. Presently the only means of locating these buoys after deployment is a very crude radiolocation technique using the buoy VHF transmitter, and involves undesirable delays. GPS has been proposed as a means of broadcasting buoy position back to the aircraft. Conventional GPS receivers in standalone mode cannot provide adequate accuracy, have relatively slow acquisition times and are still too expensive for a disposable application. This paper summarises an innovative GPS sensor to address these problems. The sensor, the TIDGET, also lends itself to other similar applications such as weather balloon (radiosonde) location, marine buoy positioning, towed-array tailbuoy positioning etc.<<ETX>>
The focus of military activity has recently shifted from large area engagements to regional conflicts. Consequently, supportive Naval maritime operations have continued to evolve toward littoral warfare in complicated shallow-water, near-shore environments. This evolution requires new sensors, advanced Concept of Operations, and improved data-analysis capabilities, among others. Planning operations in these harsh-environment areas is difficult because accurate predictions of tactical sensor performance depend on detailed knowledge of the local environmental conditions. Tactical mission planning is thus seldom optimal or efficient, often resulting in coverage gaps, increased risk, and reduced mission success. According to a Navy Mission Need Statement, "Air ASW tactical execution, especially in littoral seas, requires in-situ environmental updates for preflight mission planning. In the conduct of ASW operations, an urgent need for explicit knowledge of environmental variables is required to optimize the effectiveness of operational acoustic sensors, as well as acoustic sensors in development " The Naval Air Systems Command has considered extended-life environmental sonobuoy concepts to better characterize the littoral environment. Most designs contain a thermistor string to measure ocean temperatures and also hydrophones to measure ambient noise. This type of complex sonobuoy would be more expensive than a traditional single-measurement AXBT but it could provide a more thorough littoral environment assessment. This paper examines the trade-off between increased sensor complexity and improved ASW performance, in terms of cumulative detection probability. Some advantages of an extended-life combined thermistor string/hydrophone approach, compared to AXBTs and tactical hydrophones, are: 1) higher accuracy of the raw data; 2) temporal averaging to smooth out fluctuations; 3) extended area coverage during drift; 4) less chance for surface temperature anomalies (e.g., mixed-layer-depth errors) caused by various electronic and mechanical variability upon impact; 5) opportunities to discover thermal and acoustic feature boundaries during drift; and 6) less need to re-seed thus allowing longer tactical mission times. These advantages are evaluated relative to the following disadvantages: 1) increased cost; 2) potential drift outside the mission area; and 3) need for increased battery life for longer durations. The analysis is tempered by considering how a potential new system might be used. One assumption is that an environmental sampling decision aid is available to determine the minimum number and best initial locations of drifting sensors to meet performance objectives. The November 2007 Requirements Document from the Naval Oceanographic Office states ?Sampling guidance: Development of guidance on the best way to deploy, spatially and temporally, observation systems in order to meet various forecasting, model assimilation, and model evaluation objectives is needed.? Work in this area is reported in this Oceans '09 Conference in a paper entitled ?Uncertainty-based Adaptive AXBT Sampling with SPOTS?, which addresses optimal sampling requirements. For this trade-off analysis, temperature data from watersampling flights in the Sea of Japan off the east coast of Korea were used to simulate expected capability of a long-term drifting thermistor string. Then optimal initial positions for three notional buoys were determined followed by a simulation of drifting positions and data collected over 12 days. Ocean nowcasts were constructed and used to determine acoustic performance of a notional tactical sonobuoy field. The analysis shows that a drifting extended-life thermistor string can provide significant improvement in environmental characterization, tactical planning, and ASW detection performance.
Navigation algorithms needed to accomplish the deployment of sonobuoys are discussed. A simulation computer program was written to implement the algorithms that is flexible enough to allow for development of current and future sonobuoys. The primary goal of the algorithms is to provide maximum outer-zone coverage, so that acoustic signals emanating from the 1990s ASW threat can be detected by a multisensor sonobuoy screen. Precise deployment is accomplished by using the algorithms in conjunction with the Doppler navigation radar and the satellite global positioning system hardware planned for the SV-22 aircraft. Deployment of sonobuoys by the SV-22 extends the outer zone of defense.<<ETX>>
A system has been developed to track arrays consisting of several sonobuoys deployed for acoustic detection. This navigation technique can be used to track the position of any free-drifting hydrophones. The method, employing bottom-moored acoustic transponders, can provide relative hydrophone positions to within 20 meters. Ultimate geographical positioning is dependent on the accuracy of the primary navigation system available; satellite navigation can yield absolute positions to within 200 meters. The system operates in real time, yielding a hydrophone fix every 20-30 seconds. Sonobuoy arrays have been deployed for acoustic detection and localization of microearthquakes in the median valley of the Mid-Atlantic Ridge.
A design for underwater network management is proposed in this paper. The underwater network is a tree-shaped construction and has several sub-networks. Being a hierarchy network, every sub-network has a center node that is the gateway of the network, and the sonobuoy is played as center node. Autonomous Underwater Vehicles (AUVs) are the common nodes, and equipped with sonar and underwater acoustic communication modern. The multiple tasks can be assigned to different sub-network, or accomplished cooperatively. With communication and detection range constraints, AUVs move in the survey area to get maximum range that obeys the rule of Voronoi participation algorithm. When some mobile node moves away from the prevenient center, the sub-network should be reconstructed, and the node would join in other nearer sub-network. The flexible and robust construction can be used to cooperative target detection and environment inspection.
Sonobuoy is a sensory device collecting underwater acoustic signals and transmitting them to some base stations via RF waveforms. In this paper, newly developed Turkish sonobuoy project's sea performance is presented. The proposed system architecture has been developed as a prototype in the lab environment. Lab experiments have been conducted successfully over a test bench representing typical submarine detection case. These experiments are designed to calibrate sensory system and optimize the RF transmission. The sonobuoy system has been used in open sea environment for the similar submarine scenario. The bearing angle representing submarine position has been detected within ± 10° accuracy as required. We, then, compared the lab and experimental open sea results that were identical.
Optimal monostatic sonobuoy fields were developed during the Cold War for deep, uniform undersea environments, where a simple median detection range defined a fixed spacing between sonobuoys. Oceanographic and acoustic conditions in littoral environments are so complex and dynamic that spatial and temporal variability destroys the basic homogeneous assumption associated with standard tactical search concepts. There have been several attempts to design near-optimal placements of passive and monostatic-active sonobuoys. Most of these are evaluation algorithms, as opposed to true planning algorithms. Recently, Genetic Algorithms (GA) were successfully applied to monostatic mobile sensors to produce near-optimal, non-standard search tracks for multiple searchers in complicated environments (Kierstead and DelBalzo, Military Operations Research Journal (March/April 2003)). For the present work, we developed a new capability, SCOUT (Sensor Coordination for Optimal Utilization and Tactics) to optimize the locations and ping times of multistage active sonobuoys in a complex, littoral environment. We made two major modifications to the mobile-sensor GA approach to account for bistatic sonobuoy fields. The first was in the structure, where we added a new chromosome to describe the bistatic search plan. It has one gene for each sonobuoy, consisting of a location and two ping times. Positions and times in the new chromosome mutate independently. The second modification was in detection modeling, where we incorporated a model for bistatic detection. For this work, we postulated that all sonobuoys could be monitored simultaneously, and that each was capable of bistatic detection from any of the other sonobuoy's sources. The SCOUT algorithms are an extension to our previous GA work and to the best of our knowledge they represent the only solution that designs sonobuoy placements in complicated environments from scratch, as opposed to recommending general effort allocations or simply evaluating standard patterns with different parameters. This paper discusses the new chromosome structure and initial simulation results. The results show a) that standard patterns are not optimal even for a homogeneous environment and b) that standard patterns are grossly ineffective in inhomogeneous environments where 20% improvements in detection are achieved with SCOUT.
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