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An Underwater Velocity-Independent DOA Estimation Based on Improved Toeplitz Matrix Reconstruction. [PDF]
Sensors (Basel)Zhao X, Lei Z, Wang Y, Ning G.
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Developments in Sonar and Array Technologies
2011 IEEE Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies, 2011Sonar and Array Technologies have been developed over more than 100 years. This paper will give an exposition of this development with emphasis on the most recent one. However, tracks to earlier sonar types will be illuminated. Demands to sonar and arrays will be discussed, and an exposition will be given of the state-of-the-art in single-beam and ...
L Bjørnø
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Sonar Arrays and Array Processing
AIP Conference Proceedings, 2005Arrays of hydrophones have been part of Navy sonar systems for over fifty years now. They are used both passively and actively and now are quite sophisticated. These arrays were used in fixed configuration such as the SOSUS system and towed arrays deployed from surface ships and submarines.
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The Journal of the Acoustical Society of America, 1991
A sonar array connected to a data unit includes a substantial number of hydrophone units distributed along a small diameter cable having a substantial number of connecting wires, a center strength member and a tough polyurethane jacket. The hydrophone units each include a strong metal bracket bifurcated at each end and fastened to the strength member ...
Daniel G. Hathaway, Robert M. Bridges
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A sonar array connected to a data unit includes a substantial number of hydrophone units distributed along a small diameter cable having a substantial number of connecting wires, a center strength member and a tough polyurethane jacket. The hydrophone units each include a strong metal bracket bifurcated at each end and fastened to the strength member ...
Daniel G. Hathaway, Robert M. Bridges
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The Journal of the Acoustical Society of America, 1989
A cylindrical array employs rectangular planar array segments which extend in the axial direction when assembled on a cylindrical conducting plate having flat longitudinal portions to which the planar array segments are attached. Each planar array segment comprises two columns of planar transducer elements with each column extending in the axial ...
Stanley L. Ehrlich, George G. Gray
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A cylindrical array employs rectangular planar array segments which extend in the axial direction when assembled on a cylindrical conducting plate having flat longitudinal portions to which the planar array segments are attached. Each planar array segment comprises two columns of planar transducer elements with each column extending in the axial ...
Stanley L. Ehrlich, George G. Gray
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Sonar array signal processing for sparse linear arrays
ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359), 2003Acoustic signals which propagate through the ocean have wavefronts which can differ significantly from the "planar wavefronts" assumed in array signal processing. In this paper we investigate the performance of the the minimum variance distortionless response (MVDR) beamformer and the previously introduced Fourier integral method (FIM), when applied to
I. S. D. Solomon +2 more
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A novel beamformer for circular sonar arrays
ICASSP '81. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005A new Beamformer (BF) technique using Linear Deltamodulation (DM) on the spatially sampled circular array sensor signals is presented. In this method, the FIR-type of beam-former implementation for circular arrays results in an extremely simplified hardware which does away with multipliers and retains basically adders.
Rajendar Bahl, P. V. Indiresan
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Thinned array transducer for sonar
The Journal of the Acoustical Society of America, 1983The thinned arrayed transducer for a sonar system includes an array of sonar elements mounted in rows (layers) and columns (staves) on a structure, preferably cylindrical, to form a checkerboard pattern wherein the spacing between adjacent elements in the rows and the columns is equal to or greater than λm /2, where λm is the wavelength of the signal ...
Eugene E. Hill +2 more
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The Journal of the Acoustical Society of America, 1988
A transducer array which includes backing and an acoustic window separated by a plurality of elongated parallel rail members having notches in the sidewalls thereof. Notches in adjacent rail members accommodate a stave member which carries a plurality of transducer elements. A stave member may be placed in the notch and slid into position from which it
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A transducer array which includes backing and an acoustic window separated by a plurality of elongated parallel rail members having notches in the sidewalls thereof. Notches in adjacent rail members accommodate a stave member which carries a plurality of transducer elements. A stave member may be placed in the notch and slid into position from which it
openaire +1 more source