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Tuesday, April 28, 2020 | History

2 edition of Modeling the performance of the PT Sur hydrophone array in localizing blue whales found in the catalog.

Modeling the performance of the PT Sur hydrophone array in localizing blue whales

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Published by Naval Postgraduate School, Available from National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


About the Edition

The acoustic activity of the blue whale is widely documented yet poorly understood. Hypotheses for its vocalizations range from communication, bathymetric echolocation and echolocation of zooplankton masses. Although extensive documentation of frequency structure and duration exists, a long term monitoring of where and when the vocalizations are being made must be accomplished to test the validity of these theories. The Naval Postgraduate School (NPS) Ocean Acoustic Observatory (OAO), which operates a former Sound Surveillance System (SOSUS) at Pt Sur, presents itself as a potentially valuable tool in the detection and localization of Pacific blue whales.

Edition Notes

StatementCarl Allen Hager
ContributionsNaval Postgraduate School (U.S.)
The Physical Object
Paginationx, 40 p. ;
Number of Pages40
ID Numbers
Open LibraryOL25294285M

SIMPLIFIED METHOD FOR OBTAINING NAVIGATIONAL INFORMATION FROM HYDROPHONE ARRAYS By Rolando Panez December Chair: A. Antonio Arroyo Major Department: Electrical and Computer Engineering This thesis describes a simplified method of acquiring acoustic information from a hydrophone array. The hardware consists of an amplifier circuit and. Citation: Guazzo, RA, Helble TA, D’Spain GL, Weller DW, Wiggins SM, Hildebrand JA. Migratory behavior of eastern North Pacific gray whales tracked using a hydrophone array. Ceramic and Fibre Optic Hydrophone as Sensors for Lightweight Arrays - a Comparative Study Venugopalan Pallayil greatly improved by adding a hydrophone array and towing it behind them. Apart from the conventional ceramic based The different performance parameters of the array such as its sensitivity, channel count, frequency and.


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Modeling the performance of the PT Sur hydrophone array in localizing blue whales by Carl Allen Hager Download PDF EPUB FB2

Hydrophone Arrays. A hydrophone array is made up of a number of hydrophones placed in known locations. These hydrophones maybe placed in a line on the seafloor, moored in a vertical line in the water column, or towed in a horizontal line behind a boat or ship, for example.

The second performance measure is the percentage of range samples where the normalized signal power, averaged over some range interval, exceeds a given threshold. SAMPLE RESULTS Figures 2 and 3 illustrate sample results of modeling a hydrophone circular array in Author: Ronald R.

Lambert, Steven F. Magruder. Whales Localization Using a Large Hydrophone Array: Performance Relative to Cramer-Rao Bounds and Confidence Regions Downloads; Part of the Communications in Computer and Information Science book series (CCIS, volume Multiple real-time 3D tracking of simultaneous clicking whales using hydrophone array and linear sound speed profile Author: Frédéric Caudal, Hervé Glotin.

Using a coherent hydrophone array for observing sperm whale range, classification, and shallow-water dive profiles Duong D. Tran, Wei Huang, Alexander C. Bohn, and Delin Wang Department of Electrical and Computer Engineering, Northeastern University, Huntington Avenue, Boston, Massachusetts Zheng Gong and Nicholas C.

MakrisCited by: Three-dimensional tracking of Cuvier’s beaked whales’ echolocation sounds using nested hydrophone arrays Martin Gassmann,a) Sean M.

Wiggins, and John A. Hildebrand Scripps Institution of Oceanography, Gilman Drive, La Jolla, CaliforniaUSA. A large-aperture low-cost hydrophone array for tracking whales from small boats B. Miller and S. Dawson Department of Marine Science, University of Otago, P.O.

Box 56, DunedinNew Zealand. Cetacean Research Technology produces a selection of hydrophone systems that we routinely suggest for commercial whale watching operations. These hydrophone systems are easy to operate and provide superior audio quality, so your passengers will be able hear all the sounds whales, dolphins, and porpoises produce within the human hearing range.

A wideband connection to sperm whales: A fiber-optic, deep-sea hydrophone array. Author Modeling the performance of the PT Sur hydrophone array in localizing blue whales book open overlay panel Anders Heerfordt a Bertel and the single accelerometer is insufficient to determine the 3-D geometry of the array.

Modeling Modeling the performance of the PT Sur hydrophone array in localizing blue whales book curvature of the array in 2-D with a simple curve and using a general least-squares fitting method Cited by: Three-dimensional localization of sperm whales using a single hydrophone Article in The Journal of the Acoustical Society of America (4) · November with Reads.

A hydrophone (Ancient Greek: ὕδωρ + φωνή, lit. 'water + sound') is a microphone designed to be used underwater for recording or listening to underwater tula-music.com hydrophones are based on a piezoelectric transducer that generates an electric potential when subjected to a.

Offshore killer whale tracking using multiple hydrophone arrays Martin Gassmann,a) E. Elizabeth Henderson, and Sean M.

Wiggins Scripps Institution of Oceanography, Gilman Drive, La Jolla, California Marie A. Roch Department of Computer Science, San Diego State University, Campanile Drive, San Diego, California hydrophone array. several hydrophones attached to each other at known fixed distances so the location of sound sources can be calculated.

A three-dimensional localization method for tracking sperm whales with as few as one sensor is demonstrated. Based on ray-trace acoustic propagation modeling, the technique exploits multipath arrival information Modeling the performance of the PT Sur hydrophone array in localizing blue whales book recorded sperm whale clicks and can account for waveguide propagation physics like interaction with range-dependent bathymetry and ray refraction.

It also does not require ray Cited by: Cetacean Research ™ C56 modular hydrophones are intended to be connected to as many as five other C56 hydrophones (for a total of 6 channels) on a single cable to form an easy-to-use array.

They are an inline version of the Cetacean Research ™ C55 hydrophone. These preamplified, cylindrical hydrophones are designed for the detection of infrasonic, audible, and ultrasonic tula-music.com Frequency Range (±3dB) [kHz]: to A Two-hydrophone Range and Bearing Localization with Performance Analysis John Thomas Gebbie Portland State University, [email protected] Martin Siderius Portland State University, [email protected] John S.

Allen III University of Hawaii at Manoa Let us know how access to this document benefits tula-music.com by: A passive sonar array designed for tracking diving sperm whales in three dimensions from a single small vessel is presented, and the advantages and limitations of operating this array from a 6 m boat are described.

The system consists of four free floating buoys, each with a hydrophone, built-in recorder, and global positioning system receiver (GPS), and one vertical stereo hydrophone array Cited by: Acoustic tracking of sperm whales using two sets of hydrophone array.

In International Symposium on Underwater Technology, UT'04 - Proceedings (pp. ) Acoustic tracking of sperm whales using two sets of hydrophone tula-music.com by: 8. of beluga whales has been measured to be approximately ˚ and is thus narrower than the bottlenose dolphin beam.

The total beam width of the beluga is also nar- of a quadratic hydrophone array was chosen to 75 cm by 75 cm. A spatially larger array would allow dolphins to swim farther away whilst still measuring the whole beam. Held the collateral position of Special Projects Officer responsible for the Anti-Surface Improvement Program (AIP) implementation.

Reported to Naval Postgraduate School, Monterey, California in September Completed thesis titled "Modeling the Performance of the PT SUR Hydrophone Array in Localizing Blue Whales". showed poor acoustic performance at higher speeds above 6 knots, presumably due to turbulent flow and vibrations.

The designs also rotated during turns, thus causing torque on the tow cable and uncertainty in the array orientation. Despite the shortcomings of these designs, the concept of a light-weight, towed volumetric array showed merit. SOSUS, an acronym for sound surveillance system, is a chain of underwater listening posts located around the world in places such as the Atlantic Ocean near Greenland, Iceland and the United Kingdom—the GIUK gap—and at various locations in the Pacific tula-music.com United States Navy's initial intent for the system was for tracking Soviet submarines, which had to pass through the gap to attack.

Early each morning, in the base's onshore acoustics room, researchers began by identifying where whales were located within the hydrophone array.

The rectangular-shaped array, broadcast on computer monitors, showed colored lights representing each hydrophone. Hydrophone, device for converting sound waves into electrical signals, similar in operation to a microphone but used primarily for detecting sound waves from an underwater source, such as a submarine.

Usually an array of hydrophones is employed to pinpoint the source: the array is. Eastern North Pacific gray whales make one of the longest annual migrations of any mammal, traveling from their summer feeding areas in the Bering and Chukchi Seas to their wintering areas in the lagoons of Baja California, Mexico.

Lesson C: Using Hydrophones for Research!. Ask the students if they know what a hydrophone is. Explain that it’s an underwater microphone. Ask the students if they can describe what a hydrophone looks like.

After some time, distribute the different images of the hydrophones (images hydrophone tula-music.com and iclisten_jpg) and explain to the. Hydrophone Acoustic Receiver Modeling: Turbulent Flow Modeling and Acoustic Analysis A. Bharath, D. Groulx* and S. Campbell 1 Department of Mechanical Engineering, Dalhousie University, Halifax, NS, Canada *[email protected] Abstract: The field of underwater acousticsAuthor: A.

Bharath, D. Groulx, S. Campbell. Line Array Hydrophone: Continuous and Discrete. Technical note: for long line array, to avoid high pull force acting on the underwater connectors and the array cables, a reinforced rope with high pull strength shall be used along the array, and the array cables are tied on the reinforced rope with soft cotton rope (avoid scratching or damaging cable jacket).

Jul 24,  · A towed hydrophone array is deployed during shipboard surveys to detect and record cetacean vocalizations. In addition to helping inform visual survey data, these recordings provide baseline data on the vocalization characteristics of lesser known species.

Strategically deployed sonobuoys also provide opportunistic recordings of target species. Passive acoustic monitoring using a towed hydrophone array results in identification of a previously unknown beaked whale habitat Tina M.

Yacka) and Jay Barlow Southwest Fisheries Science Center, NMFS, NOAA, La Jolla Shores Drive, La Jolla, California The Salish Sea Hydrophone Network and Orca Network are two citizen science projects dedicated to furthering our understanding of abundance, distribution, behavior, and habitat use by the endangered population of Southern Resident Killer Whales, also called orcas.

The Hydrophone Network lets the public listen for orcas through their computers and phones, while the Orca Network. A Guide to Constructing Hydrophones and Hydrophone Arrays for Monitoring Marine Mammal Vocalizations [Jay Barlow, Southwest Fisheries Science Center: NPAA, et al.] on tula-music.com *FREE* shipping on qualifying offers.

In the 's the National Oceanic and Atmospheric Administration (NOAA) was made to manage our oceanic and atmospheric tula-music.com by: 7. In the center of the hydrophone is the air cavity (white) allowing the best sensitivity to be rendered to the cylindrical microphone element (blue).

Because there is air inside, there is also a weighted area (indicated by a grey coil) which keeps the hydrophone oriented properly when in the water.

Jun 20,  · Open-water monitoring using a hydrophone. Array Hydrophones. Array hydrophones (streamers - built of multiple transducers) are all wired to receive a large sound signal collectively. The transducers are packed together in a tube with oil, which aids the collection of Author: Azosensors.

hydrophone (hī`drəfōn'), device that receives underwater sound waves and converts them to electrical energy; the voltage generated can then be read on a meter or played through a tula-music.com hydrophone is the marine equivalent of the microphone, which receives and converts sound waves in air.

It is used in sonar apparatus and in certain underwater weapons. transmitted from a J-9 sound projector suspended from the Research Vessel Pt Sur while over the U.S. Navy Southern California Offshore Range (SCORE) Underwater Acoustic Range from 11 to 13 August The transmissions were recorded by a group of seven near.

Abstract. Since Mayan array of autonomous hydrophone moorings has been continuously deployed in the eastern equatorial Pacific to provide long-term monitoring of seismic activity, including low-level volcanic signals, along the East Pacific Rise between 20°N and 20°S and the Galapagos Ridge.

A series of 10 to 20 kHz, frequency-sweeping signals synthesizing whistles of vocalizing Odontocetes was transmitted from a J-9 sound projector suspended from the Research Vessel Pt Sur while over the U.S. Navy Southern California Offshore Range (SCORE) Underwater Acoustic Range.

However, the new hydrophone can pick up sounds from 10 toHertz. During a recent meeting with underwater acoustics experts, Ryan played a few of the distinctive sounds recorded with the hydrophone. The first were low-frequency sounds that resembled a semi-truck downshifting. Ryan explained that these were the calls of blue whales.

Observations and Bayesian location methodology of transient acoustic signals (likely blue whales) in the Indian Ocean, using a hydrophone triplet. Le Bras RJ(1), Kuzma H(2), Sucic V(3), Bokelmann G(1).

Author information: (1)Institut für Meteorologie und Geophysik, University of Vienna, Vienna, tula-music.com by: 1. "Passive acoustic monitoring (PAM) of cetaceans using towed hydrophone arrays is a principle component of shipboard cetacean population surveys conducted by the National Marine Fisheries Service (NMFS).

The traditional array design used by the NMFS i. Active High Frequency Phased-Array Sonar for Whale Shipstrike Avoidance: Target Strength Measurements submarines, pdf. The difference with whales is that performance modeling and system design requires information on the target strength of the whales.

This paper blue and red. Table I summarizes the results of the target strength.Hydrophone definition is - an instrument for listening to sound transmitted through water.Tracking sperm whale (Physeter ebook dive profiles using a towed passive acoustic arraya) animals with respect to the array, provided that the hydrophone depths are independently measured.

whales from a vertical array,34 as well as a horizontal array.