Results 51 to 60 of about 127 (116)

Enhanced Beampattern Synthesis Using Electromagnetically Reconfigurable Antennas

2025 33rd European Signal Processing Conference (EUSIPCO)
Beampattern synthesis seeks to optimize array weights to shape radiation patterns, playing a critical role in various wireless applications. In addition to theoretical advancements, recent hardware innovations have facilitated new avenues to enhance beampattern synthesis performance.
Pinjun Zheng, Md. Jahangir Hossain 0002, Anas Chaaban   +2 more
openaire   +3 more sources

Metaheuristic Algorithm‐Based Antenna Selection Collaborative Beamforming for Remote Sensors

Electronics Letters, Volume 61, Issue 1, January/December 2025.
ABSTRACT In this letter, we propose a metaheuristic‐based antenna selection (AS) technique for collaborative beamforming (CB). While AS can retain more power at the intended base station (BS) than CB with all sensors participating, it suffers from interference caused by proximal sidelobes.
Semyoung Oh, Daejin Park
wiley   +1 more source

Synthesis of Large Ultra‐Wideband Rotationally Symmetric Sparse Circular Arrays

IET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.
The paper introduces an efficient method for synthesising large, wideband rotationally symmetric sparse circular arrays. This method uses several concentric auxiliary rings within the circular aperture, composed of rotationally symmetrical folds, to distribute the array elements exclusively over these rings, enhancing optimisation efficiency by ...
Hao Wen, Peng‐Fei Gu, Shu‐Yi Chen, Zhen‐Hong Fan, Da‐Zhi Ding   +4 more
wiley   +1 more source

PSLL and HPBW Minimisation in Time‐Variant FDA Using Sum‐of‐Sinc‐Functions‐Based Frequency Offsets

IET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.
FDA beampattern optimisation ignores time variance and the optimum PSLL degrades with time sweep. This work considers time variance and finds the optimum FDA frequency offsets using a window function that is a sum of three Sinc functions. ABSTRACT Beampattern of a frequency diverse array (FDA) is a function of time, range and angle.
Ahmad Bilal, Yash H. Shah, Abdul Hadee, S. Bhattacharjee, Choon Sik Cho   +4 more
wiley   +1 more source

Modelling real‐world effects in near‐field SAR collections for compressive sensing

IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.
This paper develops previously published work on using compressive sensing techniques to suppress sidelobes in SAR images to develop a higher‐fidelity measurement model. Using Cranfield University's GBSAR System a series, experimental measurements are conducted, and image estimation techniques are applied to this real data.
George A. J. Price, Daniel Andre, Chris Moate, Peter Yuen, Mark Finnis   +4 more
wiley   +1 more source

Broadened-Beam Uniform Rectangular Array Coefficient Design in LEO SatComs Under Quality of Service and Constant Modulus Constraints

IEEE Access
Satellite communications (SatComs) are expected to provide global Internet access. Low Earth orbit (LEO) satellites (SATs) have the advantage of providing a higher downlink capacity due to their smaller link budget compared with medium Earth orbit (MEO ...
Weiting Lin, Yuchieh Wu, Borching Su
doaj   +1 more source

Hyperparameter free sparse estimation for wideband multiple‐input‐multiple‐output radar direction finding without secondary data

IET Radar, Sonar &Navigation, Volume 18, Issue 12, Page 2552-2563, December 2024.
DOA estimation for wideband multiple‐input‐multiple‐output (MIMO) radar without secondary data is investigated in this paper. The authors establish a signal model for wideband MIMO radar system, and propose a DOA estimation algorithm, named sparse learninng via iterative minimization for wideband MIMO radar.
Jiong Xiao, Bo Tang
wiley   +1 more source

Physics-Informed Deep Neural Network for Low Sidelobe Cosecant-Squared Pattern Time-Modulated Antenna Array with Harmonic Suppression [PDF]

Journal of Electromagnetic Engineering and Science
In this paper, a physics-informed deep neural network (PIDNN)-based approach with phase-only weighting is proposed for the synthesis of a cosecant-squared radiation pattern time-modulated linear array (TMLA).
Tarek Sallam, Qun Wang, Ahmed M. Attiya
doaj   +1 more source

Optimising collection geometry for long‐range synthetic aperture sonar interferometry

IET Radar, Sonar &Navigation, Volume 18, Issue 11, Page 2034-2043, November 2024.
A technique is presented to optimise data collection geometry in synthetic aperture sonar interferometry. This can be used to maximise the area coverage rate in seabed imaging and mapping. Abstract Interferometric synthetic aperture sonar (SAS) is a technique to image and map the seabed in very high resolution. For large area coverage rate systems with
Roy Edgar Hansen, Torstein Olsmo Sæbø
wiley   +1 more source

An experimental test of endfire synthetic aperture sonar for sediment characterisation

IET Radar, Sonar &Navigation, Volume 18, Issue 11, Page 2057-2065, November 2024.
At low‐frequencies, direct measurements of sediment volume scattering have rarely been made, due to the bias in by interface roughness scattering caused by the large beamwidths of low‐frequency sonars. Endfire Synthetic Aperture Sonar (EF‐SAS) can achieve narrower beamwidths by forming a vertically oriented synthetic array as a transimtter and/or ...
Shannon‐Morgan Steele, Anthony P. Lyons   +1 more
wiley   +1 more source