Results 241 to 250 of about 47,269 (283)
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2017
Multibeam echosounders have revolutionized our ability to resolve seabed geomorphology and regionally define its substrate. Using a fan of narrow acoustic beams, the slant ranges, angles and returned backscattered intensity can be employed to define the seabed elevation and infer the substrate.
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Multibeam echosounders have revolutionized our ability to resolve seabed geomorphology and regionally define its substrate. Using a fan of narrow acoustic beams, the slant ranges, angles and returned backscattered intensity can be employed to define the seabed elevation and infer the substrate.
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1986 International Electron Devices Meeting, 1986
High power klystrons operating in the 300-600 MHz frequency range, used in science for particle accelerators, have the drawback of being bulky and requiring very high voltages. Since klystron dimensions grow far less rapidly than the power they can deliver, one could propose to employ tubes of 4 to 5 MW each when total power requirements are of several
M. Bres, G. Faillon, D.T. Tran
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High power klystrons operating in the 300-600 MHz frequency range, used in science for particle accelerators, have the drawback of being bulky and requiring very high voltages. Since klystron dimensions grow far less rapidly than the power they can deliver, one could propose to employ tubes of 4 to 5 MW each when total power requirements are of several
M. Bres, G. Faillon, D.T. Tran
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Multibeam reflecting nanoklystron
2008 International Conference on Microwave and Millimeter Wave Technology, 2008The aim of the present paper is to address the issues of whether it is possible to designed develop by numerical simulation the electromagnetic continuous-wave THz- sources width electrically tunable frequency. These sources may well find their use, say, in the fields of applications such as the development of THz-spectroscopy, high- resolution radars,
V. D. Yeryomka +2 more
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Multibeam and Multibarrel Gyrotrons
2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2019The report analyzes the perspective of multibeam and multibarrel version of gyrotron for possibility of frequency tuning and improved mode selection at gyrotron working on the gyrofrequency harmonics.
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Multibeam for Joint Communication and Radar Sensing Using Steerable Analog Antenna Arrays
IEEE Transactions on Vehicular Technology, 2018Beamforming has a great potential for joint communication and radar sensing (JCAS), which is becoming a demanding feature on many emerging platforms, such as unmanned aerial vehicles and smart cars.
J. A. Zhang +4 more
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Digest on Antennas and Propagation Society International Symposium, 2003
A multibeam antenna prototype for an ESM system is presented. The antenna is formed by a semicircular array of Vivaldi radiating elements, fed by an RKR microstrip lens. Both the lens and the array are printed on the same dielectric substrate. The antenna operates over one octave frequency band.
M. Sierra +3 more
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A multibeam antenna prototype for an ESM system is presented. The antenna is formed by a semicircular array of Vivaldi radiating elements, fed by an RKR microstrip lens. Both the lens and the array are printed on the same dielectric substrate. The antenna operates over one octave frequency band.
M. Sierra +3 more
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1992
We present here the development of a multibeam echosounder. Its specifications have been defined for fishing applications. The L.M.P. has managed the preliminary studies and the realization of the prototype with the support of IFREMER (Institut Francais pour la Recherche et l’Exploitation de la MER) which has also organized the sea trials on an ...
P. Challande +4 more
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We present here the development of a multibeam echosounder. Its specifications have been defined for fishing applications. The L.M.P. has managed the preliminary studies and the realization of the prototype with the support of IFREMER (Institut Francais pour la Recherche et l’Exploitation de la MER) which has also organized the sea trials on an ...
P. Challande +4 more
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Proceedings of the IEEE, 1968
The application of general N-port Butler matrices to the generation of multiple beams-from planar arrays is described. It is shown that the array must satisfy a "covering" condition. The interconnection of array and matrix is derived. The method, for determination of beam position is developed and applied to rectangular arrays to improve beam crossover
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The application of general N-port Butler matrices to the generation of multiple beams-from planar arrays is described. It is shown that the array must satisfy a "covering" condition. The interconnection of array and matrix is derived. The method, for determination of beam position is developed and applied to rectangular arrays to improve beam crossover
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IEEE Transactions on Microwave Theory and Techniques, 1992
The Advanced Communication Technology Satellite (ACTS), to be launched in 1993, is introduced briefly, and then the Ka-band multibeam antenna, consisting of electrically similar 30 GHz receive and 20 GHz transmit offset Cassegrain systems utilizing orthogonal linear polarizations, is described.
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The Advanced Communication Technology Satellite (ACTS), to be launched in 1993, is introduced briefly, and then the Ka-band multibeam antenna, consisting of electrically similar 30 GHz receive and 20 GHz transmit offset Cassegrain systems utilizing orthogonal linear polarizations, is described.
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A multibeam subbottom profiler
The Journal of the Acoustical Society of America, 2006A multibeam subbottom profiling system (MSBPS) is being built with funding from the Defense University Research Instrumentation Program (DURIP) in coordination with the Office of Naval Research. The MSBPS is being constructed from three T70 Neptune Sonar transducer modules in a line.
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