Results 21 to 30 of about 32,801 (229)

Challenges in the Multibeam Antennas

, 2018
In this project, we are trying to shed light on various aspects of the antenna arrays. Special focus is on solving the problems related to multibeam antennas. One traditional application of the multibeam antennas is sum and difference patterns.
Morteza Shahpari
core   +4 more sources

Multibeam Energy Moments of Multibeam Particle Velocity Distributions [PDF]

, 2020
High‐resolution electron and ion velocity distributions, f(v), which consist of N effectively disjoint beams, have been measured by NASA's Magnetospheric Multiscale Mission and in reconnection simulations. Commonly used standard velocity moments assume a
Goldman, M.V., G. Lapenta, Newman, D.L., Eastwood, J.P., D. L. Newman, Lapenta, G., J. P. Eastwood, Newman, DL, Lapenta, G, M. V. Goldman, Eastwood, JP, Goldman, MV   +11 more
core   +1 more source

Multibeam Hybrid Transmitarray Based on Polarization Rotating Metasurface With Reconfigurable Bidirectional Radiation [PDF]

IEEE Transactions on Antennas and Propagation
This article proposes a bidirectional multibeam hybrid transmitarray (HTA) using a transmission polarization-rotating metasurface (TPRM). A novel configuration is introduced to facilitate bidirectional beam-scanning by combining the transmitarray (TA ...
Fan Qin, Yifei Liu, Chao Gu, Linfeng Zeng, Wenchi Cheng, Hai-Lin Zhang, S. Gao   +6 more
semanticscholar   +1 more source

Adaptive beamforming for large arrays in satellite communications systems with dispersed coverage [PDF]

, 2011
Conventional multibeam satellite communications systems ensure coverage of wide areas through multiple fixed beams where all users inside a beam share the same bandwidth. We consider a new and more flexible system where each user is assigned his own beam,
Larue de Tournemine, Cécile, J. Montesinos, O. Besson, Besson, Olivier, C. Larue de Tournemine, Montesinos, Julien   +5 more
core   +1 more source

Predicted Mapping of Seabed Sediments Based on MBES Backscatter and Bathymetric Data: A Case Study in Joseph Bonaparte Gulf, Australia, Using Random Forest Decision Tree

Journal of Marine Science and Engineering, 2021
Predictive mapping of seabed sediments based on multibeam bathymetric (BM), and backscatter (BS) data is effective for mapping the spatial distribution of the substrate.
Wei Xu, Heqin Cheng, Shuwei Zheng, Hao Hu   +3 more
doaj   +1 more source

Hybrid Machine Learning and CUBE Method for Multibeam Data Cleaning [PDF]

TransNav
Multibeam data contains different types of errors that are classified as systematic errors, random errors and gross errors (outliers). Accurate bathymetric base surface production requires efficient cleaning methods to detect and reject the outliers. The
Mohammed El-Diasty, Rifaat Abdalla, Faisal Alsaaq   +2 more
doaj   +1 more source

Sub-millisecond 4D X-ray tomography achieved with a multibeam X-ray imaging system

Applied Physics Express, 2023
A proof-of-concept experiment for sub-millisecond temporal and 10 μm order spatial resolution 4D X-ray tomography imaging using a multibeam X-ray imaging system is reported.
Xiaoyu Liang, W. Voegeli, H. Kudo, E. Arakawa, T. Shirasawa, K. Kajiwara, T. Abukawa, W. Yashiro   +7 more
semanticscholar   +1 more source

Autosub6000: a deep diving long range AUV [PDF]

, 2008
With an ultimate range up to 1000 km, a maximum operating depth of 6000 m, and a generous payload capacity, Autosub6000 is well placed to become one of the world’s most capable deep diving Autonomous Underwater Vehicles (AUVs).
McPhail, Stephen
core   +2 more sources

Seabed sediments (grain size) of Nordland VI, offshore north Norway

Journal of Maps, 2017
This paper presents a seabed sediments (grain size) map of the Nordland VI area (25,000 km2) off the Lofoten islands, north Norway. The map is based on multibeam echosounder data (bathymetry and backscatter), visual analysis of 215 video transects (each ...
Valérie K. Bellec, Reidulv Bøe, Leif Rise, Aave Lepland, Terje Thorsnes, Lilja Rún Bjarnadóttir   +5 more
doaj   +1 more source

Multibeam bathymetry data of the western part of the Romanche Trench (Equatorial Atlantic)

Data in Brief, 2021
We present the multibeam bathymetry data of the western part of the Romanche Trench (Equatorial Atlantic) which is the main natural corridor that regulates inflow of Antarctic Bottom Water into the eastern basin of the Atlantic Ocean.
Mariia V. Kapustina, Dmitry V. Dorokhov, Vadim V. Sivkov   +2 more
doaj   +1 more source