Results 61 to 70 of about 9,233 (214)

OFDM radar waveform optimization for low grazing angle scenarios using mismatched filter via convex solution

EURASIP Journal on Wireless Communications and Networking
In this paper, a novel approach to design a mismatched filter orthogonal frequency division multiplexing waveform, with the design criteria of peak sidelobe level is presented, which is used in a low grazing angle scenario.
Zohreh Asadsangabi, Reza Mohseni, Sadegh Samadi   +2 more
doaj   +1 more source

Synthesis of Sparse Arrays Based On CIGA (Convex Improved Genetic Algorithm)

Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2020
In this paper, a novel hybrid algorithm on beam pattern synthesis of sparse arrays is proposed, which aims at minimizing the peak sidelobe level (PSLL). Sparse arrays can provide higher spatial resolution and relatively lower sidelobe than general arrays,
Jianxiong Li, Shuang Ren, Cuijuan Guo
doaj   +1 more source

Using baseline-dependent window functions for data compression and field-of-interest shaping in radio interferometry

, 2016
In radio interferometry, observed visibilities are intrinsically sampled at some interval in time and frequency. Modern interferometers are capable of producing data at very high time and frequency resolution; practical limits on storage and computation ...
Atemkeng, M. T., Foster, G., Jonas, J., Smirnov, O. M., Tasse, C.   +4 more
core   +2 more sources

First Coincident Radar and Optical Observations of a Meteor Radio Afterglow

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract It has been hypothesized that Meteor Radio Afterglows (MRAs) occur due to resonant transition radiation (RTR) where suprathermal electrons emit as they pass through electron density inhomogeneities in a turbulent plasma. Meteor trails are thought to produce suprathermal electrons through anion oxidation, which can be identified through meteor ...
K. S. Obenberger, J. L. Chau, J. Vierinen, D. Vida, L. E. Cordonnier, Z. Balint, M. Clahsen, E. Dao, J. Dowell, J. M. Holmes, R. F. Kelly, D. Kastinen, N. Pfeffer, K. Robinson, G. B. Taylor, J. M. Urco   +15 more
wiley   +1 more source

A Dual-Polarized Wideband Parabolic Reflector Antenna With High Aperture Efficiency and Low Sidelobe Level for L/S-Band Satellite Communications

IEEE Access
A dual-polarized (DP) wideband parabolic reflector antenna with high aperture efficiency and low sidelobe level is proposed for L/S-band vehicular satellite communications.
Xiao Ding, Xingxing Yang, Botao Feng, Chow-Yen-Desmond Sim, Sulin Wu, Kwok L. Chung   +5 more
doaj   +1 more source

Primary Beam and Dish Surface Characterization at the Allen Telescope Array by Radio Holography

, 2011
The Allen Telescope Array (ATA) is a cm-wave interferometer in California, comprising 42 antenna elements with 6-m diameter dishes. We characterize the antenna optical accuracy using two-antenna interferometry and radio holography. The distortion of each
Ackermann, R. F., ATA GROUP, Atkinson, Shannon, Backer, D. C., Backus, P. R., Barott, William, Bauermeister, Amber, Blair, Samantha K., Blitz, Leo, Bock, D. C. -J., Bower, Geoffrey C., Bradford, Tucker, Cheng, Calvin, Croft, Steve, Davis, M. M., DeBoer, D. R., Dexter, Matt, Dreher, John, Engargiola, Greg, Fields, Ed, Forster, J. R., Gutierrez-Kraybill, Colby, Harp, G. R., Heiles, Carl, Helfer, Tamara, Jordan, Jane, Jorgensen, Susan, Keating, Garrett, Kilsdonk, Tom, Law, Casey, Lugten, John, MacMahon, D. H. E., McMahon, Peter, Milgrome, Oren, Nadler, Z. J., Pierson, Tom, Randall, Karen, Ross, John, Shostak, Seth, Siemion, Andrew, Smolek, Ken, Tarter, J. C., Thornton, Douglas, Urry, Lynn, Welch, W. J., Werthimer, Dan, Whysong, David, Williams, Peter K. G., Wright, M. C. H.   +48 more
core   +1 more source

Near‐Bed Flow Turbulence Beneath Ice Cover Under Varying Hydrological Conditions: A 9‐Year Field Measurement‐Based Analysis From a Meander Bend

Water Resources Research, Volume 62, Issue 3, March 2026.
Abstract Climate change alters hydrological and ice conditions, but how these changes affect turbulence beneath ice cover has been poorly studied. This study presents a multi‐year observational analysis of near‐bed turbulence under ice cover in a subarctic meandering river reach.
Karoliina Lintunen, Essi Vilhonen, Tuure Takala, Linnea Blåfield, Elina Kasvi, Eliisa Lotsari, Petteri Alho   +6 more
wiley   +1 more source

Subarray partition based on sparse array weighted K‐means clustering

Electronics Letters
This paper introduces the subarray partition based on the sparse array weighted K‐means clustering method, which extends the conventional K‐means clustering method through the inclusion of a weight matrix approach. This matrix is derived by recording the
Jiayu Zhao, Jianming Huang, Yansong Cui, Naibo Zhang, Yuxuan Wang, Zilai Wang   +5 more
doaj   +1 more source

Phase Change Material‐Driven Tunable Metasurface for Adaptive Terahertz Sensing and Communication in 6G Perceptive Networks

Advanced Functional Materials, Volume 36, Issue 12, 9 February 2026.
This study explores the benefits of metasurfaces made from functional materials, highlighting their ability to be adapted and improved for various high‐frequency applications, including communications and sensing. It first demonstrates the potential of these functional material‐based metasurfaces to advance the field of sub‐THz perceptive networks ...
Yat‐Sing To, Jiachen Du, Cyril Decroze, Laure Huitema, Aurelian Crunteanu, Hang Wong   +5 more
wiley   +1 more source

Planar High-Gain Millimeter-Wave Slotted SIW Cavity Antenna Array with Low Sidelobe and Grating Lobe Levels

International Journal of Antennas and Propagation, 2022
In this paper, a planar high-gain millimeter-wave (mmW) slotted substrate integrated waveguide (SIW) cavity antenna array with low sidelobe and grating lobe levels is proposed. The antenna consists of a slotted SIW resonator and an SIW transmission line (
Wenyu Ma, Wenquan Cao, Chuang Wang, Shujie Shi, Bangning Zhang   +4 more
doaj   +1 more source