Author: Kevin Donn HeaneyPublisher:
ISBN:
Category : Internal waves
Languages : en
Pages : 604
Book Description
Inverting for Source Location and Internal Wave Strength Using Long Range Ocean Acoustic Signals
Author: Kevin Donn HeaneyPublisher:
ISBN:
Category : Internal waves
Languages : en
Pages : 604
Book Description
Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 820
Book Description
The Journal of the Acoustical Society of America
Author: Acoustical Society of AmericaPublisher:
ISBN:
Category : Architectural acoustics
Languages : en
Pages : 1052
Book Description
Broadband Modal Coherence and Beamforming at Megameter Ranges
Author: Kathleen E. WagePublisher:
ISBN:
Category : Fourier analysis
Languages : en
Pages : 650
Book Description
Normal modes, the eigenfunctions of the ocean waveguide, are useful in underwater acoustics because the lowest modes provide an efficient description of the most energetic signals at long ranges. Understanding the structure of the mode arrivals at megameter ranges is crucial to tomographic and matched field processing applications, but there have been few opportunities for experimental observation of these signals. First, this thesis develops a short-time Fourier transform (STFT) framework for estimating broadband signals propagating in the lowest modes. Since previous research has focused on narrowband sources, this work concentrates on broadband processing issues. Specifically, it addresses the fundamental issue of frequency resolution required for mode estimation, analyzes the performance characteristics of two modal beamforming algorithms and explores the time/frequency trade-offs inherent in STFT mode processing. Second, this work presents a detailed analysis of the low-mode arrivals at megameter ranges using data from the Acoustic Thermometry of Ocean Climate experiment. Short-time Fourier processing of receptions at a range of 3,515 kilometers reveal a complicated multipath arrival structure. This thesis characterizes the temporal coherence of the arrivals, computes average dispersion curves, and examines trends in arrival time over five months of data.
Explorations
Author: Using Ambient Noise and Sources of Opportunity to Estimate Environment Parameters and Improve Matched Field Source Detection and Localization
Author: Paul HurskyFull Field Inversion Methods in Ocean and Seismo-Acoustics
Author: Orest DiachokPublisher: Springer Science & Business Media
ISBN: 9401584761
Category : Technology & Engineering
Languages : en
Pages : 424
Book Description
Recent advances in the power of inversion methods, the accuracy of acoustic field prediction codes, and the speed of digital computers have made the full field inversion of ocean and seismic parameters on a large scale a practical possibility. These methods exploit amplitude and phase information detected on hydrophone/geophone arrays, thereby extending traditional inversion schemes based on time of flight measurements. Full field inversion methods provide environmental information by minimising the mismatch between measured and predicted acoustic fields through a global search of possible environmental parameters. Full Field Inversion Methods in Ocean and Seismo-Acoustics is the formal record of a conference held in Italy in June 1994, sponsored by NATO SACLANT Undersea Research Centre. It includes papers by NATO specialists and others. Topics covered include: · speed and accuracy of acoustic field prediction codes · signal processing strategies · global inversion algorithms · search spaces of environmental parameters · environmental stochastic limitations · special purpose computer architectures · measurement geometries · source and receiving sensor technologies.
Contributions - Scripps Institution of Oceanography
Author: Scripps Institution of OceanographyPublisher:
ISBN:
Category : Marine biology
Languages : en
Pages : 448
Book Description
Springer Handbook of Acoustics
Author: Thomas RossingPublisher: Springer Science & Business Media
ISBN: 0387304460
Category : Science
Languages : en
Pages : 1179
Book Description
This is an unparalleled modern handbook reflecting the richly interdisciplinary nature of acoustics edited by an acknowledged master in the field. The handbook reviews the most important areas of the subject, with emphasis on current research. The authors of the various chapters are all experts in their fields. Each chapter is richly illustrated with figures and tables. The latest research and applications are incorporated throughout, including computer recognition and synthesis of speech, physiological acoustics, diagnostic imaging and therapeutic applications and acoustical oceanography. An accompanying CD-ROM contains audio and video files.
Sound Propagation in the Sea
Author: Robert J. UrickPublisher:
ISBN:
Category : Sound
Languages : en
Pages : 268
Book Description