Author: Thomas Scott BrandesPublisher:
ISBN:
Category :
Languages : en
Pages : 160
Book Description
Passive Localization of Acoustic Sources in Media with Non-constant Sound Velocity
Author: Thomas Scott BrandesPublisher:
ISBN:
Category :
Languages : en
Pages : 160
Book Description
Bioacoustics
Author: Passive Acoustic Localization and Tracking Using Arrays and Directional Sensors
Author: Ludovic Tenorio-HalléPublisher:
ISBN:
Category :
Languages : en
Pages : 129
Book Description
In bioacoustics, passive acoustic localization and tracking plays an important role in studying marine mammals and other organisms that produce underwater sounds. However, the implementation of such techniques faces many practical challenges, such as lack of environmental data for accurately modeling acoustic propagation, uncertainties in sensor position, time-synchronization of autonomous instruments, and logistical constraints due to large arrays. The three research chapters of this dissertation cumulatively address these hurdles. Chapter 2 develops a reformulation of the "double-difference" method for long-range tracking of acoustic sources. Originally developed for high-resolution localization of earthquakes across a network of widely distributed sensor, the double-difference approach is here adapted to exploit acoustic multipath on a vertical array, deployed in a deep-water waveguide. Results are shown to provide high-precision relative depth and range tracks of sources on the order of 50 km away, by compensating for biases caused by underdetermined array tilt and sound speed model. The method is demonstrated on both a towed acoustic source and a sperm whale (Physeter macrocephalus). Chapter 3 presents a passive time-synchronization technique for independent autonomous acoustic recorders. This approach relies on the coherent ambient noise sources maintaining the same statistical angular distribution around the instruments. Under this assumption, the temporal evolution of the cross-correlation function between sensor pairs reveals their relative time drift. This method enables continuous measurements of clock offset, including small-scale non-linear fluctuations of the drift, otherwise unobservable with standard time-synchronization techniques. Data from a field study in San Ignacio Lagoon, Mexico, is used to demonstrate this technique which is here applied to low frequency pulses, most likely originating from croaker fish (Sciaenidae family). Chapter 4 uses acoustic vector sensor data to track multiple sources simultaneously. The method is demonstrated on singing humpback whales (Megaptera novaeangliae) off western Maui. Here, the directional capabilities of vector sensors are exploited to identify and match azimuthal tracks from multiple sources between sensors, yielding localized whale tracks in terms of latitude and longitude over time. This approach shows potential for further applications such as tracking boats and analyzing the directional properties of ambient noise field.
Applied mechanics reviews
Author: Scientific and Technical Aerospace Reports
Author: Sound Source Localization
Author: Richard R. FayPublisher: Springer Science & Business Media
ISBN: 0387288635
Category : Science
Languages : en
Pages : 340
Book Description
The Springer Handbook of Auditory Research presents a series of compreh- sive and synthetic reviews of the fundamental topics in modern auditory - search. The volumes are aimed at all individuals with interests in hearing research including advanced graduate students, postdoctoral researchers, and clinical investigators. The volumes are intended to introduce new investigators to important aspects of hearing science and to help established investigators to better understand the fundamental theories and data in ?elds of hearing that they may not normally follow closely. Each volume presents a particular topic comprehensively, and each serves as a synthetic overview and guide to the literature. As such, the chapters present neither exhaustive data reviews nor original research that has not yet appeared in peer-reviewed journals. The volumes focus on topics that have developed a solid data and conceptual foundation rather than on those for which a literature is only beginning to develop. New research areas will be covered on a timely basis in the series as they begin to mature.
Velocity-Free Localization Methodology for Acoustic and Microseismic Sources
Author: Longjun DongPublisher:
ISBN: 9789811986116
Category :
Languages : en
Pages : 0
Book Description
In this book, we proposed velocity-free localization methods for acoustic and microseismic sources. This method does not require predetermination of wave velocity, which is a dynamically adjusted free real-time parameter. These methods solve the problem of large localization error caused by the difference between measured wave velocity and actual wave velocity in the source area and greatly improve the positioning accuracy. They are suitable for complex structures where the wave velocity changes dynamically in time and space, such as mines, bridges, buildings, pavements, loaded mechanical structures, dams, geothermal mining, oil extraction, and other engineering fields. This book includes progress in the development of localization methods, factors affecting the accuracy of source localization, analytical methods without the pre-measured wave velocity, velocity-free numerical methods for localizing acoustic sources, combined optimal velocity-free localization methods, velocity-free source localization considering complex paths of spatial structures, and theories as well as some cases of engineering applications of these methods.
Master's Theses Directories
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 492
Book Description
"Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Ocean Acoustic Tomography
Author: Walter Heinrich MunkPublisher: Cambridge University Press
ISBN: 0521470951
Category : Mathematics
Languages : en
Pages : 457
Book Description
This book presents the oceanography and mathematics necessary to develop a practical system to interpret the behaviour of the oceans.
Real-time Acoustic Source Localization with Passive Microphone Arrays
Author: Arden HuangPublisher:
ISBN:
Category : Microphone
Languages : en
Pages : 248
Book Description