Initial Analysis Of The Data From The Vertical DIFAR Array

D’Spain, Gerald L.; Hodgkiss, William S.; Edmonds, G. L.; Nickles, J. C.; Fisher, F. H.; Harriss, R.A.

doi:10.1109/oceans.1992.612715

Cited by 54 publications

(42 citation statements)

References 7 publications

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“…Both time delay localization methods and DIFAR processing of bearing angle from each sonobuoy were applied to the data ͑D 'Spain, 1994;D'Spain et al, 1992͒. The DIFAR bearing errors were found to have a standard deviation of two degrees ͑McDonald, unpublished data͒.…”

Section: Biopsies Of Blue Whalesmentioning

confidence: 99%

The acoustic calls of blue whales off California with gender data

McDonald¹,

Calambokidis

Teranishi

et al. 2001

The Journal of the Acoustical Society of America

124

133

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The acoustic calls of blue whales off California are described with visual observations of behavior and with acoustic tracking. Acoustic call data with corresponding position tracks are analyzed for five calling blue whales during one 100-min time period. Three of the five animals produced type A-B calls while two produced another call type which we refer to as type D. One of the animals producing the A-B call type was identified as male. Pauses in call production corresponded to visually observed breathing intervals. There was no apparent coordination between the calling whales. The average call source level was calculated to be 186 dB re: 1 μPa at 1 m over the 10–110-Hz band for the type B calls. On two separate days, female blue whales were observed to be silent during respective monitoring periods of 20 min and 1 h.

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Section: Biopsies Of Blue Whalesmentioning

confidence: 99%

The acoustic calls of blue whales off California with gender data

McDonald¹,

Calambokidis

Teranishi

et al. 2001

The Journal of the Acoustical Society of America

124

133

View full text Add to dashboard Cite

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“…Co-located but orthogonally oriented velocity hydrophones have been used by D'Spain et al [12] in linearly constrained minimum-variance (LCMV) beamforming toward predetermined directions. Shchurov et al [14] had also deployed similar arrays to measure ambient noises but not for source localization.…”

Section: B Summary Of Relevant Literaturementioning

confidence: 99%

“…Although two distinct matrix-pencil pairs have been formed, only one eigendecomposition of this data covariance matrix is necessary because both matrix pencils are formed from the same data set. Let be the signal subspace matrix composed of the eigenvectors corresponding to the largest eigenvalues of the sample covariance matrix (12) where is the noise subspace matrix composed of the eigenvectors corresponding to the smallest eigenvalues, is a diagonal matrix whose diagonal entries are the largest eigenvalues, and is a diagonal matrix whose diagonal entries contain the smallest eigenvalues. asymptotically approaches the following form: (13) (14) where is an unknown nonsingular matrix to be determined.…”

Section: A Adapting Esprit To a Uniform Rectangular Vector-hydrophonmentioning

confidence: 99%

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Extended-aperture underwater acoustic multisource azimuth/elevation direction-finding using uniformly but sparsely spaced vector hydrophones

Wong

Zoltowski

1997

IEEE J. Oceanic Eng.

130

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Abstract-Aperture extension is achieved in this novel ESPRITbased two-dimensional angle estimation scheme using a uniform rectangular array of vector hydrophones spaced much farther apart than a half-wavelength. A vector hydrophone comprises two or three spatially co-located, orthogonally oriented identical velocity hydrophones (each of which measures one Cartesian component of the underwater acoustical particle velocity vector-field) plus an optional pressure hydrophone. Each incident source's directions-of-arrival are determined from the source's acoustical particle velocity components, which are extracted by decoupling the data covariance matrix's signal-subspace eigenvectors using the lower dimensional eigenvectors obtainable by ESPRIT. These direction-cosine estimates are unambiguous but have high variance; they are used as coarse references to disambiguate the cyclic phase ambiguities in ESPRIT's eigenvalues when the intervector-hydrophone spacing exceeds a halfwavelength. In one simulation scenario, the estimation standard deviation decreases with increasing intervector-hydrophone spacing up to 12 wavelengths, effecting a 97% reduction in the estimation standard deviation relative to the half-wavelength case. This proposed scheme and the attendant vector-hydrophone array outperform a uniform half-wavelength spaced pressurehydrophone array with the same aperture and slightly greater number of component hydrophones by an order of magnitude in estimation standard deviation. Other simulations demonstrate how this proposed method improves underwater acoustic communications link performance. The virtual array interpolation technique would allow this proposed algorithm to be used with irregular array geometries.

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“…For example, Wong and Zoltowski (1999), (2000) introduced Root-MUSIC-based and MUSIC-based source localization algorithms for vector sensors. Theoretical and technological development of the vector sensor also revitalized interest in using spatial filtering (beamforming) to localize acoustic sound sources (D'Spain et al, 1992;Hawkes and Nehorai, 1998;Wong and Chi, 2002;Zou and Nehorai, 2009). D 'Spain et al (2006) pointed out that the Taylor series expansion of the acoustic pressure field about a single point in space provides the theoretical basis for array processing with measurements at a single point in space.…”

Section: Introductionmentioning

confidence: 99%

Direction-Selective Filters for Sound Localization

Schmidlin¹

2011

Advances in Sound Localization

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Initial Analysis Of The Data From The Vertical DIFAR Array

Cited by 54 publications

References 7 publications

The acoustic calls of blue whales off California with gender data

The acoustic calls of blue whales off California with gender data

Extended-aperture underwater acoustic multisource azimuth/elevation direction-finding using uniformly but sparsely spaced vector hydrophones

Direction-Selective Filters for Sound Localization

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