Bibliografias temáticas / Underwater Acoustic Communicati

Literatura científica selecionada sobre o tema "Underwater Acoustic Communicati"

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Publicado: 25 de maio de 2024

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Artigos de revistas sobre o assunto "Underwater Acoustic Communicati"

Lee. "Underwater Acoustic Communication Using Nonlinear Chirp Signal". Journal Of The Acoustical Society Of Korea 33, n.º 4 (2014): 255. http://dx.doi.org/10.7776/ask.2014.33.4.255.

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Hovem, Jens M., e Hefeng Dong. "Understanding Ocean Acoustics by Eigenray Analysis". Journal of Marine Science and Engineering 7, n.º 4 (25 de abril de 2019): 118. http://dx.doi.org/10.3390/jmse7040118.

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Acoustics is important for all underwater systems for object detection, classification, surveillance systems, and communication. However, underwater acoustics is often difficult to understand, and even the most carefully conducted measurements may often give unexpected results. The use of theory and acoustic modelling in support of measurements is very important since theory tends to be better behaved and more consistent than experiments, and useful to acquire better knowledge about the physics principle. This paper, having a tutorial flair, concerns the use of ray modelling and in particular eigenray analysis to obtain increased knowledge and understanding of underwater acoustic propagation.

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Allam, Ahmed, Waleed Akbar e Fadel Adib. "An analytical framework for low-power underwater backscatter communications". Journal of the Acoustical Society of America 153, n.º 3_supplement (1 de março de 2023): A376. http://dx.doi.org/10.1121/10.0019235.

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Acoustic underwater backscatter enables ultra-low-power communication with applications in ocean exploration, monitoring, navigation, and aquaculture. Unlike traditional communication systems, acoustic backscatter does not require active signal generation. Instead, it communicates data by modulating existing acoustic signals, requiring few microwatts of power for operation. Backscatter communication enables ultra-low power sensors by switching between absorbing and reflecting acoustic waves transmitted from a central station. The energy burden is shifted to the transmitting station, and the acoustic power supplied by the station can power the sensor, allowing for battery-free operation. Initial demonstrations of underwater backscatter communication were encouraging; however, the theoretical and practical limits are still unknown. In this work, we develop a multiphysics analytical framework for the communication and power link budget of underwater backscatter. The framework calculates practical communication and power-up range, transmitter power budget, and signal-to-noise ratio, accounting for transducers’ characteristics and the underwater communication channel. The analytical predictions are validated for practical transducers using high-fidelity piezo-acoustic finite element simulations and experimental measurements. The framework will guide future backscatter systems design, identifying practical operation ranges and optimal frequencies for data transmission and batteryless operation.

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Majeed, Ishrat, e Er Jasdeep Singh. "Design and Performance Analysis of Underwater Acoustic Sensor Networks". International Journal for Research in Applied Science and Engineering Technology 10, n.º 3 (31 de março de 2022): 294–303. http://dx.doi.org/10.22214/ijraset.2022.40599.

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Abstract: The underwater acoustic sensor network (UASN) is essential for exploration missions and observation in demanding environments. The UASN'S connection route is acoustic waves, which limits its usefulness in comparison to ground sensor networks. This is the case because to its limited capacity, latency, and significant route loss. This article provides comprehensive research of the characteristics of UASN. We explore the functionality of underwater acoustic ad-hoc networks in the presence of disruptions. RF signals are used as a communication mechanism in wireless sensor networks, both terrestrial and aerial. However, in a sub-sea setting, such as deep-sea research, detecting and transmitting data needs a completely different method to underwater communication. The fact that the seas cover 70% of the earth's surface and contain massive amounts of unexplored riches cannot be ignored. The aquatic environment has largely escaped the effects of recent breakthroughs in wireless sensor networks (WSNS) and their broad application in latest studies and economic progress. Research on underwater acoustic sensor networks (UASNS) is developing at a snail's pace due to the difficulties in transferring most of the state-of-the-art of land and air based WSNS to its aquatic equivalent. The bulk of underwater activities rely on acoustic communication and specialized sensors that can endure the harsh environment of the oceans. The purpose of this study is to investigate how UASN works in different situations. End-to-end latency and energy consumption are examined in response to a variety of factors. We also investigate how well underwater acoustic ad-hoc networks perform when nodes are dispersed, and the network is large. Keywords: Under water Acoustics, Sensor, Wireless Sensor Networks, Energy Consumptions.

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Jeon, Jun-Ho, e Sung-Joon Park. "Micro-Modem for Short-Range Underwater Mobile Communication Systems". Marine Technology Society Journal 50, n.º 2 (1 de março de 2016): 48–53. http://dx.doi.org/10.4031/mtsj.50.2.4.

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AbstractRecently, there has been great interest in short-range underwater communication for applications such as water pollution monitoring, fish farming, oceanographic data collection, and underwater tactical surveillance based on underwater sensor network systems. Because underwater wireless communication relies primarily on acoustics, the development of acoustic modems has been an important topic that needs to be addressed. Furthermore, for years, underwater biomimetic fish robots have been studied in the area of biomechanics for scientific use and reconnaissance missions. In this article, we describe an underwater mobile communication system where fish robots act as sensor nodes, which is different from the conventional concept of an underwater sensor network that is static. We describe the issues that need to be resolved to provide mobility to a node, and we develop a micro-modem to meet the requirements of a moving node. Experiments conducted with prototypes in both a lake and a river verify that the proposed system provides a new degree of freedom (mobility) and is a viable approach.

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Zhou, Yuehai, Feng Tong e Xiaoyu Yang. "Research on Co-Channel Interference Cancellation for Underwater Acoustic MIMO Communications". Remote Sensing 14, n.º 19 (10 de outubro de 2022): 5049. http://dx.doi.org/10.3390/rs14195049.

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Multiple-input–multiple-output (MIMO) communication systems utilize multiple transmitters to send different pieces of information in parallel. This offers a promising way to communicate at a high data rate over bandwidth-limited underwater acoustic channels. However, underwater acoustic MIMO communication not only suffers from serious inter-symbol interference, but also critical co-channel interference (CoI), both of which degrade the communication performance. In this paper, we propose a new framework for underwater acoustic MIMO communications. The proposed framework consists of a CoI-cancellation-based channel estimation method and channel-estimation-based decision feedback equalizer (CE-DFE) with CoI cancellation functionalities for underwater acoustic MIMO communication. We introduce a new channel estimation model that projects the received signal to a specific subspace where the interference is free; therefore, the CoI is cancelled. We also introduce a CE-DFE with CoI cancellation by appending some filters from traditional CE-DFE. In addition, the traditional direct adaptive decision feedback equalization (DA-DFE) method and the proposed method are compared in terms of communication performance and computational complexity. Finally, the sea trial experiment demonstrates the effectiveness and merits of the proposed method. The proposed method achieves a more than 1 dB of output SNR over traditional DA-DFE, and is less sensitive to parameters. The proposed method provides a new approach to the design of robust underwater acoustic MODEM.

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Xu, Jie, Hui Li, You-Ling zhou, Qian Li, Liu-Xun Xue, Chong-Yue Shi e Hou Wang. "Performance analysis of vortex acoustic wave based on uniform circular array". Journal of Physics: Conference Series 2078, n.º 1 (1 de novembro de 2021): 012069. http://dx.doi.org/10.1088/1742-6596/2078/1/012069.

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Abstract As a carrier for information and energy, acoustic waves have been applied in underwater communication widely, however, the narrow band and low transmission speed are the main problems. Whether in the field of optics or electromagnetic waves, the orbital angular momentum (OAM) represents the natural properties of the spiral phase structure. By introducing the OAM into the acoustics field, the transmission capacity and spectrum efficiency of the underwater acoustic communication system can be expanded. Based on the analysis and detection of the vortex acoustic wave generated by the circular array of transducers, we studied the array generation method of the spiral acoustic beam, and gave the characteristics of the vortex acoustic beam when propagating under the water. In the direction of the main axis, the uniform circular array was used to generate different topological acoustic vortex. To determine the relationship between the OAM topology mode and the transducer array, the spiral acoustic waves in different topology modes were generated, and the number of array elements, array radius, transmission frequency, etc. were investigated to give the effects on OAM acoustic vortex.

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Lee. "Underwater Acoustic Communication of FH-MFSK Method with Multiple Orthogonal Properties". Journal of the Acoustical Society of Korea 33, n.º 6 (2014): 407. http://dx.doi.org/10.7776/ask.2014.33.6.407.

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Yun, Changho. "Underwater Multi-Channel MAC with Cognitive Acoustics for Distributed Underwater Acoustic Networks". Sensors 24, n.º 10 (10 de maio de 2024): 3027. http://dx.doi.org/10.3390/s24103027.

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The advancement of underwater cognitive acoustic network (UCAN) technology aims to improve spectral efficiency and ensure coexistence with the underwater ecosystem. As the demand for short-term underwater applications operated under distributed topologies, like autonomous underwater vehicle cluster operations, continues to grow, this paper presents Underwater Multi-channel Medium Access Control with Cognitive Acoustics (UMMAC-CA) as a suitable channel access protocol for distributed UCANs. UMMAC-CA operates on a per-frame basis, similar to the Multi-channel Medium Access Control with Cognitive Radios (MMAC-CR) designed for distributed cognitive radio networks, but with notable differences. It employs a pre-determined data transmission matrix to allow all nodes to access the channel without contention, thus reducing the channel access overhead. In addition, to mitigate the communication failures caused by randomly occurring interferers, UMMAC-CA allocates at least 50% of frame time for interferer sensing. This is possible because of the fixed data transmission scheduling, which allows other nodes to sense for interferers simultaneously while a specific node is transmitting data. Simulation results demonstrate that UMMAC-CA outperforms MMAC-CR across various metrics, including those of the sensing time rate, controlling time rate, and throughput. In addition, except for in the case where the data transmission time coefficient equals 1, the message overhead performance of UMMAC-CA is also superior to that of MMAC-CR. These results underscore the suitability of UMMAC-CA for use in challenging underwater applications requiring multi-channel cognitive communication within a distributed network architecture.

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Yoon, Jong Rak. "Performance of Convolution Coding Underwater Acoustic Communication System on Frequency Selectivity Index". JOURNAL OF THE ACOUSTICAL SOCIETY OF KOREA 32, n.º 6 (2013): 494. http://dx.doi.org/10.7776/ask.2013.32.6.494.

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Teses / dissertações sobre o assunto "Underwater Acoustic Communicati"

Garin, Raphaël. "Communication et positionnement simultanés pour les drones sous-marins autonomes". Electronic Thesis or Diss., Brest, 2023. http://www.theses.fr/2023BRES0097.

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Cette thèse porte sur la navigation des drones sous-marins autonomes (AUV) en l’absence de signaux GPS sous l’eau. Pour résoudre ce problème, elle propose une approche innovante qui combine la localisation de l’AUV avec la communication acoustique sous-marine avec une balise en surface. Cette méthode utilise l’estimation du décalage Doppler requis pour le décodage des signaux de communication afin d’estimer la vitesse relative de l’AUV. De plus, le temps de vol de la communication est utilisé pour mesurer la distance entre l’AUV et la balise. Le système final nécessite seulement des capteurs peu onéreux, tels qu’une centrale inertielle, un capteur de pression, un GPS pour l’initialisation, et un transpondeur acoustique pour le drone, combine avec un capteur de profilage de la vitesse du son. Une balise fixe communique avec le drone et est équipée d’un transpondeur acoustique. Cette approche offre une précision comparable à l’état de l’art, avec une faible empreinte spatiale et un cout réduit. Des simulations et des essais en bassin de 6 m3 ont été effectués avec succès, confirmant la faisabilité du système. De plus, des expérimentations en mer dans des conditions réelles ont montré une précision d’environ 3 mètres, démontrant l’efficacité de l’algorithme. En comparaison avec l’état de l’art, le système proposé est plus rapide à mettre en place, ne nécessite pas de calibration, est plus économique, et consomme moins d’énergie, bien qu’il soit légèrement moins précis
This thesis focuses on the navigation of autonomous underwater drones (AUVs) in the absence of underwater GPS signals. To address this issue, it proposes an innovative approach that combines AUV localization with underwater acoustic communication to a surface beacon. This method utilizes the Doppler shift estimation required for communication signal demodulation in order to estimate the relative velocity of the AUV. Additionally, the communication’s time of flight is used to measure the distance between the AUV and the beacon. The final system requires only affordable components, such as an inertial navigation system, a pressure sensor, a GPS for initialization, and an acoustic transponder for the drone, combined with a sound velocity profiling sensor. A fixed beacon communicates with the drone and is equipped with an acoustic transponder. This approach offers accuracy comparable to the state-of-the-art, with a small spatial footprint and reduced cost. Successful simulations and tests were conducted in a 6 m3 test tank, confirming the feasibility of the system. Furthermore, real-world sea trialsdemonstrated an accuracy of approximately 3 meters, showcasing the algorithm’s effectiveness.Compared to the state-of-the-art, the proposed system is quicker to set up, requires no calibration, is more cost-effective, and consumes less power, although it is slightly less accurate

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Keeser, Christopher Corson. "Shallow under water communication with passive phase conjugation and iterative demodulation and decoding". Pullman, Wash. : Washington State University, 2008. http://www.dissertations.wsu.edu/Thesis/Fall2008/c_keeser_112408.pdf.

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Thesis (M.S. in electrical engineering)--Washington State University, December 2008.
Title from PDF title page (viewed on Jan. 21, 2009). "School of Electrical Engineering and Computer Science." Includes bibliographical references (p. 51-53)

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Tate, William R. "Full-duplex underwater networking". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03sep%5FTate.pdf.

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Thottappilly, Arjun. "OFDM for Underwater Acoustic Communication". Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/34873.

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Communicating wirelessly underwater has been an area of interest for researchers, engineers, and practitioners alike. One of the main reasons for the slow rate of progress in this area is that the underwater acoustic channel is in general much more hostile â in terms of multipath, frequency selectivity, noise, and the Doppler effect â than the over-the-air radio frequency channel. In this work a time warp based technique which can be used to model time-varying wideband Doppler shifts (as seen in an UWA channel) in MATLAB is proposed. A corresponding procedure to estimate the parameters from observed data, required for inverting the effect of the time warp, is also proposed. Two different Doppler correction methods are compared; both can be used to undo the Doppler effect in measured data from an experiment subject to the wideband Doppler effect. The techniques presented correct for the wideband Doppler effect as if it changed the time scale of the received signal. The first resampling based technique corrects for the average expansion/contraction over a packet, inherently assuming the relative velocity to be constant over the duration of the packet. The second time warp based technique models time-varying Doppler shift. Sinusoids, added to the beginning and end of each packet, are used to estimate the parameters required to invert the effect of the warp. The time warp based methods are demonstrated using Orthogonal Frequency Division Multiplexing (OFDM) signals, but will in principle work for other kinds of wideband signals also. The presented results â using MATLAB based simulations, and over-the-air experiments performed in such a way as to introduce the Doppler effect in the received signals â emphasize the improvements that can be attained by using the time warp based Doppler modeling and correction method. The thesis concludes with suggestions for future work.
Master of Science

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Eggen, Trym H. 1963. "Underwater acoustic communication over Doppler spread channels". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42768.

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Nykvist, Kim. "Underwater probe for deep sea exploration : Long range acoustic underwater communication system". Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80474.

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This was a thesis that was commissioned by Researcher Peter Sigray at the Royal Institute of Technology (KTH) in Stockholm and was based on an idea by Professor Thomas Rossby, University of Rhode Island (URI). The idea was to further develop the existing Expendable Bathythermograph (XBT), which has been in use since the 1960s. This by first and foremost replacing existing transfer technology, which involved using a thin copper wire when communicating with the recipient remaining on the ship. The new way in which communication is to take place, is by acoustic signals transmitted from the freely descending probe. The goal is to be able to measure down to greater depth compared to the previous type. The aim is to increase today's in-depth measuring capacity of about 900 meters, down to depth of at least 2000 meters, preferably even deeper. The thesis project was divided into several smaller parts, some of which went on in parallel, while others had to have the preceding portion completed, in order for them to take place, i.e., to begin. Initially – and in parallel during the rest of the thesis work – their were studies of two selected books and a set of documents. This to ensure the understanding of all the concepts to be used during the development of the probe. In parallel with the studies, simulations in the computer program COMSOL Multiphysics began. The model probe geometry and material parameters were programmed. An important task was to implement and verify that the so called Perfectly Matched Layer (PML) performed as expected. This was of crucial importance, as different implementations of the PML turned out to result in different outcomes of the simulations’ data. With the results from Perfectly Matched Layer tests verified, the actual simulations could be initiated. Two different pipes were evaluated; one made of stainless steel and the other made of aluminum alloy. Their proportions were slightly different regarding diameter and length. The simulations led to the makings of plots/diagrams over the Transmission Voltage Response (TVR) over a certain frequency range (3000-17000 Hz). Directivity polar plots were also created for both pipes in the program MATLAB and by using a MATLAB. The actual assessment of the probes began in the latter part of the simulation work. There were several different steps in the process of assembling the probes. Finally, the tests in the water tank at The Defense Research Institute (FOI) could take place. For three days all the simulated results were “put to test.” The results during the tests in the water tank at FOI were promising and the remaining challenges, before a complete probe is developed, are achievable. The hypothesis that initially was set got proven, and it can be argued that the thesis as a whole successfully demonstrated it to be true. The idea of the probe is definitely worth further development, in the making of the new version of the Expendable Bathythermograph.

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Haug, Ole Trygve. "Acoustic communication for use in underwater sensor networks". Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9057.

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In this study an underwater acoustic communications system has been simulated. The simulations has been performed through use of a simulation program called EasyPLR that is based on the PlaneRay propagation model. In the simulations different pulse shapes have been tested for use in underwater communication. Different types of loss have also been studied for different carrier frequencies. Changing the carrier frequency from 20 kHz to 75 kHz gives a huge difference in both absorption loss and reflection loss. This means that there will be a tradeoff between having a high frequency for high data rate and reducing the carrier frequency to reduce the loss. The modulation technique used in this study is Quadrature phase shift keying and different sound speed profiles have been tested to see how this affects the performance. The transmission distance has been tested for several distances up to 3 km. The results show a significant difference in the performances at 1 km and 3 km for the same noise level. Direct sequence spread spectrum with Quadrature phase shift keying has also been simulated for different distances with good performance. The challenge is to get good time synchronization, and the performance is much better at 1 km than at 3 km.

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Pompili, Dario. "Efficient Communication Protocols for Underwater Acoustic Sensor Networks". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16301.

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Underwater sensor networks find applications in oceanographic data collection, pollution monitoring, offshore exploration, disaster prevention, assisted navigation, tactical surveillance, and mine reconnaissance. The enabling technology for these applications is acoustic wireless networking. UnderWater Acoustic Sensor Networks (UW-ASNs) consist of sensors and Autonomous Underwater Vehicles (AUVs) deployed to perform collaborative monitoring tasks. The objective of this research is to explore fundamental key aspects of underwater acoustic communications, propose communication architectures for UW-ASNs, and develop efficient sensor communication protocols tailored for the underwater environment. Specifically, different deployment strategies for UW-ASNs are studied, and statistical deployment analysis for different architectures is provided. Moreover, a model characterizing the underwater acoustic channel utilization efficiency is introduced. The model allows setting the optimal packet size for underwater communications. Two distributed routing algorithms are proposed for delay-insensitive and delay-sensitive applications. The proposed routing solutions allow each node to select its next hop, with the objective of minimizing the energy consumption taking the different application requirements into account. In addition, a resilient routing solution to guarantee survivability of the network to node and link failures in long-term monitoring missions is developed. Moreover, a distributed Medium Access Control (MAC) protocol for UW-ASNs is proposed. It is a transmitter-based code division multiple access scheme that incorporates a novel closed-loop distributed algorithm to set the optimal transmit power and code length. It aims at achieving high network throughput, low channel access delay, and low energy consumption. Finally, an efficient cross-layer communication solution tailored for multimedia traffic (i.e., video and audio streams, still images, and scalar sensor data) is introduced.

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Yellepeddi, Atulya. "Direct-form adaptive equalization for underwater acoustic communication". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1912/5281.

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Thesis (S.M.)--Joint Program in Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and the Woods Hole Oceanographic Institution), 2012.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 139-143).
Adaptive equalization is an important aspect of communication systems in various environments. It is particularly important in underwater acoustic communication systems, as the channel has a long delay spread and is subject to the effects of time- varying multipath fading and Doppler spreading. The design of the adaptation algorithm has a profound influence on the performance of the system. In this thesis, we explore this aspect of the system. The emphasis of the work presented is on applying concepts from inference and decision theory and information theory to provide an approach to deriving and analyzing adaptation algorithms. Limited work has been done so far on rigorously devising adaptation algorithms to suit a particular situation, and the aim of this thesis is to concretize such efforts and possibly to provide a mathematical basis for expanding it to other applications. We derive an algorithm for the adaptation of the coefficients of an equalizer when the receiver has limited or no information about the transmitted symbols, which we term the Soft-Decision Directed Recursive Least Squares algorithm. We will demonstrate connections between the Expectation-Maximization (EM) algorithm and the Recursive Least Squares algorithm, and show how to derive a computationally efficient, purely recursive algorithm from the optimal EM algorithm. Then, we use our understanding of Markov processes to analyze the performance of the RLS algorithm in hard-decision directed mode, as well as of the Soft-Decision Directed RLS algorithm. We demonstrate scenarios in which the adaptation procedures fail catastrophically, and discuss why this happens. The lessons from the analysis guide us on the choice of models for the adaptation procedure. We then demonstrate how to use the algorithm derived in a practical system for underwater communication using turbo equalization. As the algorithm naturally incorporates soft information into the adaptation process, it becomes easy to fit it into a turbo equalization framework. We thus provide an instance of how to use the information of a turbo equalizer in an adaptation procedure, which has not been very well explored in the past. Experimental data is used to prove the value of the algorithm in a practical context.
by Atulya Yellepeddi.
S.M.

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Kilfoyle, Daniel B. (Daniel Brian). "Spatial modulation in the underwater acoustic communication channel". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/29046.

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Thesis (Ph. D.)--Joint Program in Oceanography and Oceanographic Engineering (Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and the Woods Hole Oceanographic Institution), 2000.
Vita.
Includes bibliographical references (leaves 180-181).
A modulation technique for increasing the reliable data rate achievable by an underwater acoustic communication system is presented and demonstrated. The technique, termed spatial modulation, seeks to control the spatial distribution of signal energy such that multiple parallel communication channels are supported by the single, physical ocean channel. Results from several experiments successfully demonstrate higher obtainable data rates and power throughput. Given a signal energy constraint, a communication architecture with access to parallel channels will have increased capacity and reliability as compared to one with access to a single channel. Assuming the use of multiple element spatial arrays at both the transmitter and receiver, an analytic framework is developed that allows a multiple input, multiple output physical channel to be transformed into a set of virtual parallel channels. The continuous time, vector singular value decomposition is the primary vehicle for this transformation. Given knowledge of the channel impulse responses and assuming additive, white Gaussian noise as the only interference, the advantages of using spatial modulation over a deterministic channel may be exactly computed. Improving performance over an ensemble of channels using spatial modulation is approached by defining and then optimizing various average performance metrics including average signal to noise ratio, average signal to noise plus interference ratio, and minimum square error. Several field experiments were conducted. Detailed channel impulse response measurements were made enabling application of the decomposition methodology. The number, strength, and stability of the available parallel channels were analyzed. The parallel channels were readily interpreted in terms of the underlying sound propagation field. Acoustic communication tests were conducted comparing conventional coherent modulation to spatial modulation. In one case, a reliable data rate of 24000 bits per second with a 4 kHz bandwidth signal was achieved with spatial modulation when conventional signaling could not achieve that rate. In another test, the benefits of spatial modulation for a horizontally distributed communication system, such as an underwater network with autonomous underwater vehicles, were validated.
by Daniel Brian Kilfoyle.
Ph.D.

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Mais fontes

Livros sobre o assunto "Underwater Acoustic Communicati"

1966-, Xiao Yang, ed. Underwater acoustic sensor networks. Boca Raton: Auerbach Publications, 2010.

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Eggen, Trym H. Underwater acoustic communication over Doppler spread channels. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1997.

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Istepanian, Robert S. H., e Milica Stojanovic, eds. Underwater Acoustic Digital Signal Processing and Communication Systems. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-3617-5.

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Istepanian, Robert S. H. Underwater Acoustic Digital Signal Processing and Communication Systems. Boston, MA: Springer US, 2002.

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Kilfoyle, Daniel B. Spatial modulation in the underwater acoustic communication channel. Cambridge, Mass: Massachusetts Institute of Technology, 2000.

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ICASSP (24th 1999 Phoenix, Ariz.). 1999 IEEE International Conference on Acoustics, Speech, and Signal Processing: Proceedings : ICASSP99 Phoenix : March 15-19, 1999, Civic Plaza, Hyatt Regency, Phoenix, Arizona, U.S.A. Piscataway, NJ: IEEE, 1999.

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(Editor), Robert Istepanian, e Milica Stojanovic (Editor), eds. Underwater Acoustic Digital Signal Processing and Communication Systems. Springer, 2002.

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Underwater Acoustic Sensor Networks. AUERBACH, 2008.

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Jiang, Shengming. Wireless Networking Principles: From Terrestrial to Underwater Acoustic. Springer, 2018.

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Jiang, Shengming. Wireless Networking Principles: From Terrestrial to Underwater Acoustic. Springer, 2018.

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Capítulos de livros sobre o assunto "Underwater Acoustic Communicati"

Ma, Lu, Gang Qiao e Jianmin Yang. "Underwater Acoustic Communication". In Encyclopedia of Ocean Engineering, 1–8. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-10-6963-5_288-1.

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Reckendorf, Anja, Lars Seidelin e Magnus Wahlberg. "Marine Mammal Acoustics". In Marine Mammals, 15–31. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-06836-2_2.

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AbstractBioacoustics combines the fields of biology and acoustics to answer questions about hearing, sound production and sound communication in animals. Marine mammals have specialised hearing abilities and use sounds in different ways underwater. How do whales and seals use sound for communication and to find prey? How are they affected by human-made sounds from ships, oil exploration and windfarms? To answer such questions, you need to study marine mammals, be well-trained in natural sciences and know about animal anatomy, physiology and behaviour. You also need a thorough understanding of the fundamentals of acoustics, maths and physics. Bioacoustics is a truly interdisciplinary research field involving biologists, physicists and engineers trying to understand the world of biological sound, how sounds are produced and used by animals. Additionally, underwater acoustic recordings can reveal which areas animals use during different seasons. Bioacoustics can also be used to improve wildlife protection by regulating damaging sound sources in marine mammal habitats. Using the exercises at the end of this chapter, students learn about frequencies, decibels and their own hearing abilities, as well as how to build their own underwater microphone.

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Ziomek, Lawrence J. "Underwater Acoustic Communication Signals". In An Introduction to Sonar Systems Engineering, 639–90. 2^a ed. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003259640-14.

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Jiang, Shengming. "Overview of Underwater Acoustic Communication". In Wireless Networking Principles: From Terrestrial to Underwater Acoustic, 233–44. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7775-3_9.

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Guicking, Dieter. "Research on Underwater Acoustics in Göttingen". In Acoustics, Information, and Communication, 241–76. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05660-9_13.

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Junying, Hui, L. Liu, Feng Haihong e Liu Hong. "Advanced coding for Underwater Communication". In Underwater Acoustic Digital Signal Processing and Communication Systems, 227–46. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-3617-5_7.

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Khan, Imtiaz Ahmed, Nam-Yeol Yun e Soo-Hyun Park. "Nibble-CRC for Underwater Acoustic Communication". In Lecture Notes in Computer Science, 550–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-35606-3_65.

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Lou, Yi, e Niaz Ahmed. "Basic Principles of Underwater Acoustic Communication". In Textbooks in Telecommunication Engineering, 3–33. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86649-5_1.

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Stojanovic, Milica. "High-Speed Underwater Acoustic Communications". In Underwater Acoustic Digital Signal Processing and Communication Systems, 1–35. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-3617-5_1.

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Sari, H., e B. Woodward. "Digital underwater voice communications". In Underwater Acoustic Digital Signal Processing and Communication Systems, 127–65. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4757-3617-5_4.

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Trabalhos de conferências sobre o assunto "Underwater Acoustic Communicati"

DAVIES, JJ, e SA POINTER. "WIDEBAND UNDERWATER ACOUSTIC COMMUNICATION". In Underwater Acoustic Communication 1993. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/20689.

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Li, Mingyuan, Jianzhang Liu, Yan Wei, Fengzhong Qu, Minhao Zhang e Zairan Ding. "Numerical Simulation and Experimental Research of Hydrophone Flow Noise". In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19121.

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Abstract Underwater acoustic communication is an important technology in deep-sea research. In underwater acoustic communication system, when hydrophone as acoustic receiver is exposed to sea environment and moves along with an underwater vehicle, its performance is prone to be affected by various ambient noises, among which its generated flow noise is the major source. This would especially influence the performance and shorten the communication distance of underwater acoustic communication system. In this paper, we try to unveil how the flow field is correlated with the flow noise of hydrophone. The Large Eddy Simulation (LES) method and acoustic analogy were used to simulate the flow field and the sound field around hydrophone, respectively. The flow noise of hydrophone at different moving velocities was obtained. Then experiments in an anechoic tank were carried out to verify the simulation results. The subsequent analysis of the experimental results shows that the flow noise has obvious influence on underwater communication, and as the hydrophone moves faster, its sound pressure level climbs up higher. This study also further verifies the reliability of simulating the flow noise of bare hydrophone by computational fluid dynamics, and provides the theoretical basis for improving the signal-to-noise ratio of low-frequency underwater acoustic communication system.

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Jozwiak, Rafal, e Karol Listewnik. "Research on Underwater Communication Modem with FSK Modulation". In 2018 Joint Conference - Acoustics. IEEE, 2018. http://dx.doi.org/10.1109/acoustics.2018.8502401.

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KURYANOV, BF, e AK MOROZOV. "ACOUSTIC COMMUNICATION SYSTEM WITH BROADBAND PHASEMANIPULATED SIGNALS". In Underwater Acoustic Communication 1993. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/20681.

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Watanabe, Yoshitaka, Koji Meguro, Mitsuyasu Deguchi, Yukihiro Kida e Takuya Shimura. "Integrated Acoustic Communication and Positioning System Between an Autonomous Surface Vehicle and Autonomous Underwater Vehicles". In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96623.

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Abstract In underwater observation using an autonomous underwater vehicle (AUV), a support vessel typically monitors the AUV to support the observation. In order to make the AUV operation more efficient, an autonomous surface vehicle (ASV) and an acoustic multi-access communication and positioning system have developed. The developed acoustic system achieves multi-access with frequency division multiple access (FDMA) method, and the ASV can monitor up to three AUVs simultaneously. Positioning is performed with super short baseline (SSBL) method. The acoustic device has operation mode in which positioning and communication functions are integrated to achieve efficient uplink and accurate downlink simultaneously. Two observation operations were conducted successfully. In one of those, the ASV communicated with two types of AUVs during observation in 1250m water depth, then multiple access were achieved. Even nadir angle for one AUV became almost 40 degrees, the acoustic communication was performed. In another observation, two cruising AUVs were operated with a vessel and the ASV in 1500m water depth. The ASV monitored one AUV. Condition in case the device is equipped on small body of the ASV was evaluated. The communication was performed in this depth in severe condition. Furthermore integrated sequence of positioning and communication was successfully performed. Requirement in next phase, in which operation depth and number of multiple access are increased, is discussed.

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Kochanska, Iwona, e Jan H. Schmidt. "Estimation of Coherence Bandwidth for Underwater Acoustic Communication Channel". In 2018 Joint Conference - Acoustics. IEEE, 2018. http://dx.doi.org/10.1109/acoustics.2018.8502331.

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Afzulpurkar, S., P. Maurya, G. Navelkar, E. Desa, A. Mascarenhas, N. Dabholkar, R. Madhan e S. Prabhudesai. "Acoustic communication for Maya autonomous underwater vehicle - Performance evaluation of acoustic modem". In 2015 IEEE Underwater Technology (UT). IEEE, 2015. http://dx.doi.org/10.1109/ut.2015.7108327.

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Schmidt, Jan H., Aleksander M. Schmidt e Iwona Kochanska. "Multiple-Input Multiple-Output Technique for Underwater Acoustic Communication System". In 2018 Joint Conference - Acoustics. IEEE, 2018. http://dx.doi.org/10.1109/acoustics.2018.8502439.

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FRANKLIN, JB, e PJ BARRY. "UNDERWATER ACOUSTIC COMMUNICATION CHANNEL CHARACTERIZATION AT LOW FREQUENCIES IN SHALLOW WATER". In Underwater Acoustic Communication 1993. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/20688.

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TUJAKA, S. "DESIGN OF QUASIORTHOGONAL CODE FOR BPSK SIGNALS AT ASYNCHRONOUS TRANSMISSION". In Underwater Acoustic Communication 1993. Institute of Acoustics, 2024. http://dx.doi.org/10.25144/20694.

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Relatórios de organizações sobre o assunto "Underwater Acoustic Communicati"

Kilfoyle, Daniel B., e James C. Preisig. Application of Spatial Modulation to Underwater Acoustic Communication. Fort Belvoir, VA: Defense Technical Information Center, agosto de 2002. http://dx.doi.org/10.21236/ada626949.

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Preisig, James. Coupled Research in Ocean Acoustics and Signal Processing for the Next Generation of Underwater Acoustic Communication Systems. Fort Belvoir, VA: Defense Technical Information Center, outubro de 2014. http://dx.doi.org/10.21236/ada611046.

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Preisig, James. Coupled Research in Ocean Acoustics and Signal Processing for the Next Generation of Underwater Acoustic Communication Systems. Fort Belvoir, VA: Defense Technical Information Center, março de 2015. http://dx.doi.org/10.21236/ada614150.

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Preisig, James. Coupled Research in Ocean Acoustics and Signal Processing for the Next Generation of Underwater Acoustic Communication Systems. Fort Belvoir, VA: Defense Technical Information Center, agosto de 2015. http://dx.doi.org/10.21236/ada621218.

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Preisig, James. Coupled Research in Ocean Acoustics and Signal Processing for the Next Generation of Underwater Acoustic Communication Systems. Fort Belvoir, VA: Defense Technical Information Center, agosto de 2015. http://dx.doi.org/10.21236/ada621219.

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Preisig, James. Coupled Research in Ocean Acoustics and Signal Processing for the Next Generation of Underwater Acoustic Communication Systems. Fort Belvoir, VA: Defense Technical Information Center, novembro de 2015. http://dx.doi.org/10.21236/ada624104.

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Kilfoyle, Daniel B., e Lee Freitag. Application of Spatial Modulation to the Underwater Acoustic Communication Component of Autonomous Underwater Vehicle Networks. Fort Belvoir, VA: Defense Technical Information Center, agosto de 2005. http://dx.doi.org/10.21236/ada437524.

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Kilfoyle, Daniel B. Application of Spatial Modulation to the Underwater Acoustic Communication Component of Autonomous Underwater Vehicle Networks. Fort Belvoir, VA: Defense Technical Information Center, setembro de 2003. http://dx.doi.org/10.21236/ada633556.

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Beaujean, Pierre-Philippe, Steven Schock e Andres Folleco. Development of a Synchronous High-Speed Acoustic Communication and Navigation System for Unmanned Underwater Vehicles. Fort Belvoir, VA: Defense Technical Information Center, setembro de 2003. http://dx.doi.org/10.21236/ada628859.

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Zhou, Shengli. Advancing Underwater Acoustic Communication for Autonomous Distributed Networks via Sparse Channel Sensing, Coding, and Navigation Support. Fort Belvoir, VA: Defense Technical Information Center, setembro de 2010. http://dx.doi.org/10.21236/ada531929.

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