Localizing and Beamforming Freely-drifting VLF Acoustic Sensors PDF Download
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Author: Richard Lee Culver Publisher: ISBN: Category : Underwater acoustics Languages : en Pages : 362
Book Description
Self contained, freely-drifting Swallow floats capable of recording ambient ocean noise in the 1 to 25 Hz band have been designed, built and deployed by the Marine Physical Laboratory, Scripps Institution of Oceanography, University of California, San Diego, California. The buoys are ballasted to neutral buoyancy at midwater depth where they record the components of particle velocity from which sound pressure levels may be derived. Float positions are estimated using an 8 kHz acoustic ranging system and a Kalman tracking filter. Individual float times series are then combined to obtain passive, directional acoustic measurements from 1 to 25 Hz which are not contaminated by flow noise or tether strumming. The float localization and beamforming techniques are illustrated using measurements from a September 1986 Swallow float experiments conducted approximately 50 miles west of San Diego, california. A distant target of opportunity (apparently a surface ship) provides six spectral lines between 9 and 22,5 Hz which are tracked for about 90 minutes. The complex bathymetry of the experiment site complicates signal propagation, but the signal level in the beam-former output indicates that the element time series are being properly combined. (RH).
Author: Richard Lee Culver Publisher: ISBN: Category : Underwater acoustics Languages : en Pages : 362
Book Description
Self contained, freely-drifting Swallow floats capable of recording ambient ocean noise in the 1 to 25 Hz band have been designed, built and deployed by the Marine Physical Laboratory, Scripps Institution of Oceanography, University of California, San Diego, California. The buoys are ballasted to neutral buoyancy at midwater depth where they record the components of particle velocity from which sound pressure levels may be derived. Float positions are estimated using an 8 kHz acoustic ranging system and a Kalman tracking filter. Individual float times series are then combined to obtain passive, directional acoustic measurements from 1 to 25 Hz which are not contaminated by flow noise or tether strumming. The float localization and beamforming techniques are illustrated using measurements from a September 1986 Swallow float experiments conducted approximately 50 miles west of San Diego, california. A distant target of opportunity (apparently a surface ship) provides six spectral lines between 9 and 22,5 Hz which are tracked for about 90 minutes. The complex bathymetry of the experiment site complicates signal propagation, but the signal level in the beam-former output indicates that the element time series are being properly combined. (RH).
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 816
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Richard Lee Culver
Author: Richard Lee Culver
Author: George Chia-Jen Chen
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Author: Scripps Institution of Oceanography
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Author: Gerald Lynden D'Spain
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Author: T. P. Barnett