Application Of Physics Based Underwater Acoustic Signal And Array Processing Techniques To Infrasound Source Localization
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Application Of Physics Based Underwater Acoustic Signal And Array Processing Techniques To Infrasound Source Localization
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Author :
language : en
Publisher:
Release Date : 2001
Application Of Physics Based Underwater Acoustic Signal And Array Processing Techniques To Infrasound Source Localization written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
The purpose of this project is to apply physics-based signal and array processing techniques, recently developed in the area of underwater acoustics, to atmospheric infrasound data and co-located seismic field data. The source of the infrasound data is the newly installed International Monitoring System (IMS) infrasound station at Pinon Flat (PFO). The seismic data are being collected by the Southern California ANZA seismic network. Installation of the eight sensors that comprise the infrasound station at PFO was completed by mid April of this year. The space filters of the array (18 m for the inner centered triangle elements and 70 m for the outer centered triangle elements) also are nearly all in place. Preliminary data collected by this array contain some signals with significant spatial coherence across the array aperture. In particular, a large event with high signal-to-noise ratio was recorded on 23 April. Analyses of the arrival structure of this signal are presented in this paper. In addition, the spatial and temporal properties of the background noise in relation to the local environmental conditions are discussed. A focused experiment involving the temporary installation of additional infrasound sensors to provide larger array aperture is being planned for this summer. A description of the planned experiment is presented below.
Handbook Of Signal Processing In Acoustics
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Author :
language : en
Publisher: Springer Science & Business Media
Release Date : 2008
Handbook Of Signal Processing In Acoustics written by and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Digital Sonar Design In Underwater Acoustics
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Author : Qihu Li
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-03-05
Digital Sonar Design In Underwater Acoustics written by Qihu Li and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-03-05 with Science categories.
"Digital Sonar Design in Underwater Acoustics Principles and Applications" provides comprehensive and up-to-date coverage of research on sonar design, including the basic theory and techniques of digital signal processing, basic concept of information theory, ocean acoustics, underwater acoustic signal propagation theory, and underwater signal processing theory. This book discusses the general design procedure and approaches to implementation, the design method, system simulation theory and techniques, sonar tests in the laboratory, lake and sea, and practical validation criteria and methods for digital sonar design. It is intended for researchers in the fields of underwater signal processing and sonar design, and also for navy officers and ocean explorers. Qihu Li is a professor at the Institute of Acoustics, Chinese Academy of Sciences, and an academician of the Chinese Academy of Sciences.
Underwater Acoustic Signal Processing And Its Applications
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Author : Kexin Zhao
language : en
Publisher:
Release Date : 2014
Underwater Acoustic Signal Processing And Its Applications written by Kexin Zhao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Moreover, based on fact that different transmitter-receiver pairs have different reflection coefficients, we develop a weighted least-squares method where the target parameters are refined in an iterative manner using weighting. Note that if each of the receivers is equipped with a large array that can provide accurate angle estimates of the targets, the peak association problem becomes an easy problem or even disappears entirely. For such case, the active sonar system demands an advanced source localization method. However, most existing techniques are developed under the narrowband assumption, which becomes invalid due to the nature of the sonar application. We thus develop two extensions of the SLIM algorithm to solve the wideband source localization problem, which will be demonstrated to provide satisfactory performance.
Underwater Acoustics
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Author : Salah Bourennane
language : en
Publisher: IntechOpen
Release Date : 2012-03-28
Underwater Acoustics written by Salah Bourennane and has been published by IntechOpen this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-03-28 with Technology & Engineering categories.
The field of acoustic engineering has many various potential applications, such as in ocean science research and homeland security. This book provides cutting-edge knowledge in current techniques and technologies, such as the adaptive technique for underwater communication, array processing and the CI/OFDM system. One chapter takes inspiration from the natural world in proposing a new bio-inspired ranging approach for resolution purposes. Technologies such as high-resolution array processing methods can also be used to locate underwater objects in sediment, as one chapter shows. Finally, two contributions cover the applications of narrowband interference suppression and iterative equalization, and decoding schemes. Given the scope of the book, it will be required reading for researchers and engineers in the field.
High Resolution Spatial Processing In Underwater Acoustics
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Author : Ronald A. Wagstaff
language : en
Publisher:
Release Date : 1985
High Resolution Spatial Processing In Underwater Acoustics written by Ronald A. Wagstaff and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Beamforming categories.
Advanced Signal Processing Techniques For Underwater Acoustic Communication Networks
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Author : Chunshan Liu
language : en
Publisher:
Release Date : 2011
Advanced Signal Processing Techniques For Underwater Acoustic Communication Networks written by Chunshan Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
In this thesis, we develop and investigate novel signal processing techniques for underwater acoustic communication networks. Underwater acoustic channels differ from radio communication channels in the lower speed of signal propagation, richer and often sparse multipath arrivals, and more severe Doppler effect. Therefore, many signal processing techniques developed for radio communications may not work equivalently well for underwater acoustic channels. To investigate signal processing techniques in underwater acoustics, efficient simulation of signal transmission is required. Specifically, there is requirement for accurate simulation of doubly-selective underwater channels for different acoustic environments. In this thesis, a low-complexity channel simulator has been developed for scenarios with moving transmitter/receiver. The simulator is based on efficient generation of time-varying channel impulse response obtained using interpolation over a set of waymark impulse responses for a relatively small number of sampling points on the transmitter/receiver trajectory. The waymark impulse responses are generated using an acoustic field computation method, which is the most computationally expensive part of the simulator. To reduce the trajectory sampling rate, and thus, to reduce the complexity of the field computation, an approach for adjusting the time-varying multipath delays has been developed. For setting the trajectory sampling interval, a simple rule has been proposed, based on the waveguide invariant theory. To further reduce the simulator complexity, local spline interpolation is exploited. The developed simulator has been verified by comparing the simulated data with data from real ocean experiments. In particular, applying simulated data to an OFDM modem shows similar performance with that obtained from the data of a deep water experiment. In communication networks, knowledge of positions of communication nodes is important for improving the system performance. A multi-source localization technique has been proposed based on the matched field (MF) processing. The technique locates the nodes by solving a set of basis pursuit de-noising (BPDN) problems corresponding to a set of source frequencies. An efficient technique combining the homotopy approach and coordinate descent search has been developed to solve the BPDN problem. Further reduction in the complexity has been achieved by applying a position grid refinement method. Verified using simulated data generated by the proposed simulator and data from real experiment, the proposed technique outperforms other MF techniques in resolving sources positioned closely to each other, tolerance to noise and capability of locating multiple sources. To provide reliable localization based on MF techniques, accurate knowledge of the underwater acoustic environment is essential. However, such knowledge is not always available. Estimating uncertain environmental parameters can be achieved using MF inversion techniques. This requires solving a global optimization problem. Several global optimization algorithms have been investigated and an algorithm combining the simulated annealing and downhill simplex method has been applied for estimating the sound speed profile in a deep water scenario. Accurate MF localization results have been demonstrated when using the estimated sound speed profile. A very important task of communication receivers is accurate channel estimation. The knowledge of node positions and the environment can be exploited for enhancing the channel estimation accuracy and reducing the estimation complexity. This knowledge can be used to define the structure of the channel impulse response, such as the multipath spread and the sparsity. A channel estimator exploiting the channel sparsity estimated from the node positions has been proposed and investigated. The sparse taps of the channel impulse response are identified by solving a BPDN problem. The estimator employs an iterative tap-by-tap processing and uses local splines to interpolate the time-varying tap coefficients. This allows reduction in the complexity and memory requirement, whereas providing a high estimation accuracy.
Underwater Acoustic Signal Processing
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Author : Douglas A. Abraham
language : en
Publisher:
Release Date : 2019
Underwater Acoustic Signal Processing written by Douglas A. Abraham and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Electronic books categories.
This book provides comprehensive coverage of the detection and processing of signals in underwater acoustics. Background material on active and passive sonar systems, underwater acoustics, and statistical signal processing makes the book a self-contained and valuable resource for graduate students, researchers, and active practitioners alike. Signal detection topics span a range of common signal types including signals of known form such as active sonar or communications signals; signals of unknown form, including passive sonar and narrowband signals; and transient signals such as marine mammal vocalizations. This text, along with its companion volume on beamforming, provides a thorough treatment of underwater acoustic signal processing that speaks to its author’s broad experience in the field.
Localization Of A Quiet Moving Source With Modal Music And Range Coherent Matched Field Processing
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Author : Franklin Hunter Akins
language : en
Publisher:
Release Date : 2023
Localization Of A Quiet Moving Source With Modal Music And Range Coherent Matched Field Processing written by Franklin Hunter Akins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Passive acoustic signal processing has the remarkable capacity to achieve traditional goals of active sonar, such as detection and ranging, simply by listening. Matched field processing (MFP) exploits the physics of wave propagation to design filters tailored to the underwater acoustic environment and solve passive sonar problems of detection and localization. The second chapter of this dissertation introduces range-coherent MFP to increase the coherent integration time of the signal from a moving source. Range-coherent MFP searches over candidate source tracks to compute time-dependent replicas that are then used to coherently combine data over a vertical array and over multiple resolution cells.The method improves on existing methods by extending the application of MFP to low signal-to-noise ratio (SNR) regimes. The third chapter introduces modal-MUSIC to estimate waveguide properties by using the structure of noise recorded on a vertical line array. Modal-MUSIC estimates the horizontal wavenumbers of the modal field from noise on a partially-spanning array. It relaxes the requirement of state-of-the art passive methods which require a full water column spanning array. In this chapter, the modal field parameters estimated from noise with modal-MUSIC are successfully used to localize a source at high SNR without an environmental model. In the fourth chapter, these two developments are brought together to demonstrate the feasibility of MFP at low SNR in the absence of extensive a priori information on the seabed properties. The fourth chapter improves upon the model-free localization results with modal-MUSIC in chapter three by fitting the modal wavenumbers to a geoacoustic model. This dissertation extends the application of MFP to the passive localization of a low SNR moving source in the absence of knowledge of the seabed properties.
High Resolution Methods In Underwater Acoustics
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Author : Michel Bouvet
language : en
Publisher: Springer
Release Date : 1991
High Resolution Methods In Underwater Acoustics written by Michel Bouvet and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Science categories.