Results 261 to 270 of about 184,389 (296)

Performance of a cylindrical hydrophone array for practical use

2017 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC), 2017
Cylindrical arrays are widely used in sonar systems for underwater target detection. For the sake of reducing calculation, each line of hydrophones at the same azimuth direction aligned with the cylinder axis are hardwired together in practice and thus, each line array with omnidirectional sensors becomes a directional sensor steered to broadside. As a
Shaohao Zhu, Yixin Yang, Yong Wang, Qiulong Yang, Xidang Yan   +4 more
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Layout-optimized cylindrical sonar arrays

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600), 2005
The cost of sonars scales to the number of active elements. Therefore, it is favorable to reduce the number of elements without loss in imaging quality. This is a combinatorial problem, but of such a large dimension, even for small arrays, that an exhaustive search is futile. In this work, we have found layout-optimized sparsed cylindrical arrays, i.e.
J.E. Kirkebo, A. Austeng, S. Holm
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Cold compaction of an array of cylindrical fibres

International Journal of Mechanical Sciences, 2001
The biaxial compaction of a square array of circular cylinders is studied using slip-line "eld, upper bound and "nite element methods. Densi"cation is assumed to occur by plastic deformation at the contacts. It is found that contact}contact interaction has a softening e!ect on the local indentation pressure at each contact. The yield surfaces resulting
Sridhar, I., Fleck, N. A., Akisanya, A. R.   +2 more
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An improved kernel for arrays of cylindrical dipoles

Antennas and Propagation Society Symposium 1991 Digest, 2002
An improved kernel governing the interaction between parallel, nonstaggered, perfectly conducting cylindrical dipoles is introduced. The formulation is used to evaluate the symmetric component kernel for the circular array asymptotically as the number of dipoles tends to infinity while the ratio of the number of dipoles to the radius of the circle ...
D.K. Freeman, T.T. Wu
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A new technique for feeding a cylindrical array

IEEE Transactions on Antennas and Propagation, 1975
A new technique for exciting a cylindrical array is described. It uses a Butler matrix and a simple switching matrix for exciting only that sector of the array that contributes to formation of a desired radiation pattern. It accomplishes full circumferential coverage with fewer active components, reduced complexity, and better performance than other ...
G. Skahill, W. White
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A printed circuit cylindrical array antenna

1986 Antennas and Propagation Society International Symposium, 1986
The design and performance of a Ku-band cylindrical antenna are described. The antenna is designed to provide a 360\deg azimuth coverage with 20 dB sidelobes and an operating bandwidth of 1 GHz (16.0-17.0 GHz). The antenna consists of 16 facets of 2 \times 4 dipole arrays. The 360\deg coverage is obtained with a switch matrix network.
A. Agrawal, W. Powell
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A Scanning Switch Matrix for a Cylindrical Array

MTT-S International Microwave Symposium Digest, 2005
A full-commutating scanning switch matrix has been implemented for a 96-element C-band cylindrical array. The impact of cost/performance tradeoffs on the resulting configuration is discussed.
K.J. Keeping, D.S. Rogers, J-C. Sureau
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Beampattern synthesis and computation for cylindrical arrays

The Journal of the Acoustical Society of America, 1982
The synthesis and calculation of beampatterns for cylindrical arrays can be greatly simplified by factoring the problem into a line array of identical hoops under very mild restrictions on array geometry. For example, elements may be directive and hoops may be nonuniformly spaced.
Henry Cox, Robert Elmer, John Thurston
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Adaptive Nulling with a Cylindrical Array

1999
Abstract : A genetic algorithm is used to adaptively place a sidelobe null using a cylindrical array antenna. Results show that a null can be placed down to the noise floor of the measurement system within 20 to 50 power measurements. This approach to adaptive nulling is a viable means of quickly placing a null in the sidelobes of a phased array ...
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Ring antenna array with cylindrical reflector

2005 15th International Crimean Conference Microwave & Telecommunication Technology, 2005
The directed properties by the ring antenna array (RAA) of linear radiators with a cylindrical reflector are considered. The opportunity of use such RAA as the antenna of mobile communication system base station is discussed.
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