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Добірка наукової літератури з теми "Towed Hydrophone Arrays"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Towed Hydrophone Arrays"

1

Cho, Yohan, Yub Je, and Weui-Bong Jeong. "A miniaturized acoustic vector sensor with PIN-PMN-PT single crystal cantilever beam accelerometers." Acta Acustica 4, no. 5 (2020): 17. http://dx.doi.org/10.1051/aacus/2020017.

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Directional sound detection using vector sensors rather than large hydrophone arrays is highly advantageous for target detection in SONAR. However, developing highly sensitive and compact vector sensors for use in a system whose size is limited has been a challenging issue. In this paper, we describe a miniaturized acoustic vector sensor with piezoelectric single crystal accelerometers for the application in towed line arrays. A mass-loaded cantilever beam accelerometer with a [011] poled PIN-PMN-PT single crystal shows a better signal-to-noise ratio compared to accelerometers with other piezoelectric materials because of its superior piezoelectric properties in the 32 direction. We suggested a sufficiently compact vector sensor by using a cylindrical hydrophone with 10 mm in diameter as a housing of the single crystal accelerometers. Two single crystal accelerometers were orthogonally mounted inside the cylindrical hydrophone to detect direction of sound in the transverse plane of the line array. The receiving voltage sensitivity of the accelerometers and hydrophone was −199 and −196 dB, respectively, at 3 kHz. The directional cardioid beams generated by summing the omnidirectional beam from the hydrophone and the dipole beam from the accelerometers were validated over the entire operating frequency.
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2

Douglass, Alexander S., Warren T. Wood, Benjamin J. Phrampus, and Shima Abadi. "The effects of array design on acoustic data collected during marine seismic reflection surveys." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A241. http://dx.doi.org/10.1121/10.0011194.

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Marine seismic reflection surveys provide an abundance of acoustic data that are potentially useful for an array of analyses within and in addition to geoacoustic studies. A single cruise typically produces thousands to tens of thousands of acoustic events, with hundreds of hydrophones recording each event over towed arrays that can span up to 15 km or more. However, the structure of the airgun source arrays and the receiver arrays is typically not obvious from the data alone and the pre-processing of the data may yield misleading results if not properly accounted for. Generally, the acoustic source consists of an array of airguns configured such that the acoustic energy is focused towards the ocean floor, significantly impacting the relative intensity of the direct and reflected paths. Additionally, each array channel output typically consists of multiple hydrophone outputs, which are not individually available, averaged to generate a single channel output. Understanding the impact of these constructions is crucial for many analyses, such as mitigation of airgun pulse impacts on marine mammals. Here, we quantify the impact that these factors have on the output data and provide an analysis of this influence for an experimental case. [Work supported by ONR.]
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3

Tang Bo, 唐波, 黄俊斌 Huang Junbin, 顾宏灿 Gu Hongcan, and 毛欣 Mao Xin. "Distributed Feedback Fiber Laser Hydrophone Used in Towed Line Arrays." Chinese Journal of Lasers 43, no. 5 (2016): 0505005. http://dx.doi.org/10.3788/cjl201643.0505005.

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4

Gruden, Pina, Eva-Marie Nosal, and Erin M. Oleson. "Automated tracking of multiple acoustic sources with towed hydrophone arrays." Journal of the Acoustical Society of America 149, no. 4 (April 2021): A17. http://dx.doi.org/10.1121/10.0004387.

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5

Lapucci, Tommaso, Luigi Troiano, Carlo Carobbi, and Lorenzo Capineri. "Soft and Hard Iron Compensation for the Compasses of an Operational Towed Hydrophone Array without Sensor Motion by a Helmholtz Coil." Sensors 21, no. 23 (December 3, 2021): 8104. http://dx.doi.org/10.3390/s21238104.

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Usually, towed hydrophone arrays are instrumented with a set of compasses. Data from these sensors are utilized while beamforming the acoustic signal for target bearing estimation. However, elements of the hydrophone array mounted in the neighborhood of a compass can affect the Earth’s magnetic field detection. The effects depend upon the materials and magnetic environment present in the vicinity of the platform hosting the compass. If the disturbances are constant in time, they can be compensated for by means of a magnetic calibration procedure. This process is commonly known as soft and hard iron compensation. In this paper, a solution is presented for carrying out the magnetic calibration of a COTS (Commercial Off the Shelf) digital compass without sensor motion. This approach is particularly suited in applications where a physical rotation of the platform that hosts the sensor is unfeasible. In our case, the platform consists in an assembled and operational towed hydrophone array. A standard calibration process relies on physical rotation of the platform and thus on the use of the geomagnetic field as a reference during the compensation. As a variation on this approach, we generate an artificial reference magnetic field to simulate the impractical physical rotation. We obtain this by using a tri-axial Helmholtz coil, which enables programmability of the reference magnetic field and assures the required field uniformity. In our work, the simulated geomagnetic field is characterized in terms of its uncertainty. The analysis indicates that our method and experimental set-up represent a suitably accurate approach for the soft and hard iron compensation of the compasses equipped in the hydrophone array under test.
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Norris, Thomas F., and Tina M. Yack. "Towing the line: Line-transect based density estimation of whales using towed hydrophone arrays." Journal of the Acoustical Society of America 136, no. 4 (October 2014): 2246. http://dx.doi.org/10.1121/1.4900106.

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7

Hanson, M. Bradley, Marla M. Holt, Candice Emmons, Dawn P. Noren, Elizabeth L. Ferguson, Shannon Coates, Kerry Dunleavy, Corry Hom-Weaver, and Jeff Jacobsen. "The development and use of towed hydrophone arrays to inform Southern Resident killer whale Critical Habitat in outer coastal waters." Journal of the Acoustical Society of America 149, no. 4 (April 2021): A39. http://dx.doi.org/10.1121/10.0004454.

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8

Gruden, Pina, Yvonne Barkley, and Jennifer L. McCullough. "Insights into acoustic behavior of false killer whales." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A74—A75. http://dx.doi.org/10.1121/10.0010703.

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The Hawaiian Archipelago is home to three distinct populations of false killer whales ( Pseudorca crassidens), including one currently listed as endangered. These delphinids are known to interact with fishing gear, leading to whale mortality or injury. Hence, it is critical to assess the abundance of these populations typically achieved through visual-based sighting surveys. However, these surveys are complicated by a number of biases and uncertainties specific to this species. Passive acoustics could aid in monitoring of their population status, but the knowledge is limited about the patterns in their acoustic repertoire and behavior, which hinders our ability to derive reliable acoustics-based abundance estimates. Here, we discuss insights into the acoustic behaviour of false killer whales in the wild, gained by simultaneous tracking of both narrowband whistles and broadband echolocation clicks from towed hydrophone arrays. The results indicate a diverse acoustic behaviour between different subgroups within the same encounter, where 23.8% of subgroups (N total = 408) only echolocate, 18.9% only whistle, and 57.3% emit both types of vocalizations. Such increased understanding of false killer whale vocal behavior can contribute information from passive acoustic data for management and conservation purposes.
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Kukshtel, Natalie, Ying-Tsong Lin, and Glen Gawarkiewicz. "Localization of an acoustic autonomous underwater vehicle using multi-channel back-propagation methods." Journal of the Acoustical Society of America 153, no. 3_supplement (March 1, 2023): A302. http://dx.doi.org/10.1121/10.0018933.

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Autonomous underwater vehicles (AUVs) are extremely useful tools for studying the acoustics of complex ocean environments due to their ability to detect environmental changes with greater spatial resolution than fixed moorings. During the New England Shelf Break Acoustics (NESBA) experiments in May 2021, an AUV system was deployed to collect acoustic data for investigating the local biological, physical, and geological oceanography. This acoustic AUV system was comprised of a modified REMUS 600 vehicle, a hull-mounted 3.5 kHz transducer, and a towed multi-channel hydrophone array. Along mission profiles where the AUV is fully submerged but too shallow for bottom-lock navigation, one challenge is accurate localization of the AUV. Localization was performed in post-processing using multi-channel back-propagation methods applied to AUV source signals received at mooring hydrophones in the NESBA network as well as ship-towed sound source signals received at the AUV-towed array. Uncertainty in the localization estimates due to spatiotemporal sound speed changes was investigated, and hydrophone mooring tilt angle was determined by minimizing the localization uncertainty. Following localization, this AUV acoustic data was used to investigate local seafloor sub-bottom properties and the acoustic effects of biological scattering layers and varying physical oceanography. [Work supported by the Office of Naval Research.]
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Hepp, J. S. "Encapsulated hydrophone element for towed hydrophone array." Journal of the Acoustical Society of America 100, no. 4 (1996): 1936. http://dx.doi.org/10.1121/1.417856.

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Дисертації з теми "Towed Hydrophone Arrays"

1

Sweet, Geoffrey William. "The processing of data from multi-hydrophone towed arrrays of uncertain shape." Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240909.

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Marburger, John M. "Estimation of geoacoustic properties in the South China Sea shelf using a towed source and vertical line hydrophone array." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FMarburger.pdf.

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Анотація:
Thesis (M.S. in Physical Oceanography and Meteorology)--Naval Postgraduate School, Dec. 2004.
Thesis Advisor(s): Ching-Sang Chiu. Includes bibliographical references (p. 33). Also available online.
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3

Sen, Shoham. "Simulation and Study of Noise Generated due to Turbulent Boundary Layer in Towed Hydrophone Array." Thesis, 2016. https://etd.iisc.ac.in/handle/2005/4331.

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In this thesis, a wave propagation based analytical model is developed for an underwater towed array. The towed array is modeled as an in finite tube filled with a certain liquid and submerged in an in finite volume of water. This tube is excited by turbulent boundary layer (TBL) excitation which is modeled using both the Corcos and the Chase models. The acoustic response (self-noise) of the towed array is found using the transfer function of the tube and the PSD of the turbulent excitation. The acoustic response spectrum is compared with the results from the literature. This happens to be the main contribution of the work. This is so because very little literature is available on towed arrays. There is only one analytical work available and our results match exactly with theirs. With respect to experimental results, although there are several articles, numerical values of the tube material properties, the fluid properties and the tube dimensions have not been reported in full. This makes the comparison very difficult. Hence, by doing several parametric studies and investigating properties of materials that were applicable like rubber or Nylon, we have managed to narrow down the parameter ranges and made comparisons with the experimental results. We have matched single hydrophone TBL response with experimental results from two separate groups. We have had to vary several parameter values in order to do this. The parameters include the Young's Modulus, density, Poisson's ratio and the thickness and diameter of the tube. Also included are the density and the speed of sound of the internal fluid. Sometimes a material from a handbook was chosen that gave a set of parameters. After having matched with the experimental values, the idea was to conduct a parametric study to decide the most influential parameters. We have done this using both the dimensional physical variables as well as non-dimensional variables. We nondimensionalized the equations to help reduce the number of variables in the system and then studied the effect that each parameter has on the noise generated due to Turbulent Boundary Layer developed as a result of the tow. The dominant parameter that influences the TBL response at the hydrophone location is the tube radius a, followed by the Young Modulus E, the density of internal fluid pfi and the thickness h of the tube. An increment in a, E and h reduces the TBL response, while an pfi increment in increases the TBL response. In addition, several analytical studies were conducted to understand the dispersion characteristics of fluid-_filled submerged tubes. This study is presented in the appendix in order to avoid cluttering the main document. The main idea that emerges from this study is that there is a single real wavenumber in this coupled fluid-structure system which responds at its resonance when the TBL spectrum wavenumber matches the wavenumber value. All other free waves are complex and hence under forced excitation, they do not respond.
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4

Goris, Malcolm John. "Towed-array calibration." Phd thesis, 1995. http://hdl.handle.net/1885/144452.

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Частини книг з теми "Towed Hydrophone Arrays"

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Riley, J. L., D. A. Gray, and B. G. Ferguson. "Estimating the Shape of a Towed Array of Hydrophones Using Both Acoustic and Non-Acoustic Sensor Techniques." In Acoustic Signal Processing for Ocean Exploration, 225–30. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1604-6_22.

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"Advances in Fish Tagging and Marking Technology." In Advances in Fish Tagging and Marking Technology, edited by Julie K. Nielsen, George H. Niezgoda, S. James Taggart, Steven J. Cooke, Peter Anson, Caleb T. Hasler, Kyle C. Hanson, and Gord Carl. American Fisheries Society, 2012. http://dx.doi.org/10.47886/9781934874271.ch16.

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<i>Abstract</i>.—We present a new acoustic telemetry method for efficiently estimating positions of tagged marine and freshwater animals using vessel-based active tracking. Vessel-based tracking can require considerable time and effort, which limits both study area size and the number of tagged animals possible for telemetry studies. However, the recently-developed SYNAPS (Synthetic Aperture Positioning System) tracking method allows efficient collection of fine-scale movement information for many tagged animals within large study areas, and therefore enables large surveys to be conducted in a methodical and cost-effective manner. SYNAPS computes position estimates of tagged animals by means of hyperbolic positioning using the geographic location of a mobile hydrophone synchronized with signal detections to create a synthetic hydrophone array. Here we describe the process of tracking with SYNAPS, quantify accuracy and precision of position estimations, and provide guidelines for tracking procedures. SYNAPS position estimates were compared with known positions of fixed tags in both marine (Alaska, USA) and freshwater lake (Ontario, Canada) systems. Accuracy of position estimates ranged from 1.2 m using hull-mounted hydrophones and survey-quality GPS equipment to 23.4 m using towed hydrophones and a navigation-grade GPS receiver. This new tool will facilitate spatially explicit management applications such as aquatic protected area design and essential fish habitat designation by increasing the ability of acoustic telemetry to characterize movement of marine animals at different scales.
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Тези доповідей конференцій з теми "Towed Hydrophone Arrays"

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Abraham, Bruce M. "Low-cost dipole hydrophone for use in towed arrays." In Acoustic particle velocity sensors: Design, performance, and applications. AIP, 1996. http://dx.doi.org/10.1063/1.50338.

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Gadre, A. S., D. K. Maczka, D. Spinello, B. R. McCarter, D. J. Stilwell, W. Neu, M. J. Roan, and J. B. Hennage. "Cooperative localization of an acoustic source using towed hydrophone arrays." In 2008 IEEE/OES Autonomous Underwater Vehicles (AUV). IEEE, 2008. http://dx.doi.org/10.1109/auv.2008.5290529.

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Moldoveanu, N., R. Henman, J. Vlasin, and M. Spradley. "Bottom Referenced Vertical Hydrophone Arrays - Towed Streamers - a Comparison Study." In 59th EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 1997. http://dx.doi.org/10.3997/2214-4609-pdb.131.gen1997_b019.

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4

Gu, Hongcan, Junbin Huang, Huabing Yu, Rizhong Li, Bo Tang, and Jing Wu. "A 4-element fiber laser hydrophone towed linear array." In International Symposium on Optoelectronic Technology and Application 2014, edited by Jurgen Czarske, Shulian Zhang, David Sampson, Wei Wang, and Yanbiao Liao. SPIE, 2014. http://dx.doi.org/10.1117/12.2072075.

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Rand, Richard H., Deepak V. Ramani, William L. Keith, and Kimberly M. Cipolla. "The Quadratically-Damped Mathieu Equation and Its Application to Submarine Dynamics." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1764.

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Abstract This work is motivated by naval use of passive towed sonar arrays of hydrophones. We consider the simplest model of a towed mass. The mass is considered to move only in a horizontal direction x perpendicular to the tow direction. The tension in the tow cable is expected to be nonconstant due to turbulence, and is modeled by a sinusoidal forcing function. The resulting differential equations are analyzed for linear stability and nonlinear dynamical effects. In particular we study the nonlinear dynamics of the ODE: x ¨ + ( δ + ϵ cos t ) x + x ˙ | x ˙ | = 0
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Odom, Jonathan L., and Jeffrey Krolik. "Heading and hydrophone data fusion for towed array shape estimation." In ICA 2013 Montreal. ASA, 2013. http://dx.doi.org/10.1121/1.4800390.

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Zhang, Haiyan, Xuefeng Wang, and Chen Zhao. "Sea trial of 16-element DFB-FL hydrophone towed array." In Optical Fiber Sensors and Communication, edited by Songnian Fu, Jie Zhang, and Jun Yang. SPIE, 2019. http://dx.doi.org/10.1117/12.2547727.

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Holmes, Jason, and Amy Kukulya. "Characteristics of an autonomous underwater vehicle with a towed hydrophone array." In OCEANS 2006. IEEE, 2006. http://dx.doi.org/10.1109/oceans.2006.306932.

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Gopi, Sarath, V. P. Felix, Sabu Sebastian, V. Pallayil, and S. Kuselan. "In-situ non-acoustic noise measurement system for towed hydrophone array." In 2010 IEEE Instrumentation & Measurement Technology Conference Proceedings. IEEE, 2010. http://dx.doi.org/10.1109/imtc.2010.5488241.

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Wei Rao, Nan Zhang, Siliang Niu, Chunyan Cao, Shuidong Xiong, and Yongming Hu. "Seafloor exploration using a 4-element towed fiber optic hydrophone array." In 2011 International Conference on Electronics and Optoelectronics (ICEOE). IEEE, 2011. http://dx.doi.org/10.1109/iceoe.2011.6013256.

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Звіти організацій з теми "Towed Hydrophone Arrays"

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Kalmijn, Ad J. Marine Attack on Towed Hydrophone Arrays. Fort Belvoir, VA: Defense Technical Information Center, February 2002. http://dx.doi.org/10.21236/ada409150.

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Kalmijn, Adrianus J. Shark Attack Project - Marine Attack at Towed Hydrophone Arrays. Fort Belvoir, VA: Defense Technical Information Center, May 2005. http://dx.doi.org/10.21236/ada433306.

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Kalmijn, Adrianus J. Protecting Towed Hydrophone Arrays from Marine Attack: Weak-Electric and Near-Field Acoustic Causes - Biological Countermeasures. Fort Belvoir, VA: Defense Technical Information Center, April 2003. http://dx.doi.org/10.21236/ada419122.

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