Results 101 to 110 of about 61,990 (319)

Polarization Reconfigurable, Single-Layer, 2-D, Monopulse Array Antenna With Compact Comparator Circuit

IEEE Access
A single layered, planar array antenna is presented, aiming to replace the complex geometry of monopulse comparator circuits which are used in conventional corporate-fed monopulse antenna systems for direction-finding applications. This work investigates
Noman Ahmad, Muhammad Waseem, Nosherwan Shoaib, Haq Nawaz, Sultan Shoaib, Khaled A. Aljaloud, Rifaqat Hussain, Symeon Nikolaou   +7 more
doaj   +1 more source

Localization using Angle-of-Arrival (AoA) Triangulation

Proceedings of the International Workshop on Environmental Sensing Systems for Smart Cities
Indoor localization is a long-standing challenge in mobile computing, with significant implications for enabling location-aware and intelligent applications within smart environments such as homes, offices, and retail spaces. As AI assistants such as Amazon Alexa and Google Nest become increasingly pervasive, microphone-equipped devices are emerging as
openaire   +2 more sources

Risk of Retinopathy Associated with Long‐Term Use of Hydroxychloroquine in Patients with Rheumatic Diseases: A Systematic Review and Meta‐Analysis

Arthritis Care &Research, EarlyView.
Objective We aimed to estimate the prevalence and cumulative incidence of hydroxychloroquine retinopathy (HCQ‐R) and its risk factors among patients receiving long‐term HCQ with rheumatic diseases through a systematic review and meta‐analysis of observational studies that used spectral‐domain optical coherence tomography (SD‐OCT) for screening ...
Narsis Daftarian, Chloe Yue, Steve D Levasseur, Hui Xie, J. Antonio Avina‐Zubieta   +4 more
wiley   +1 more source

Current Tracking Adaptive Control of Brushless DC Motors

International Journal of Adaptive Control and Signal Processing, EarlyView.
In this paper, the current tracking for Brushless Direct Current motors is approached considering uncertainty in the parameters of the motor's model. An adaptive control scheme to compensate electrical parameters uncertainty is proposed without requiring any knowledge of the mechanical parameters.
Fernanda Ramos‐García, Axel Coronado‐Andrade, Gerardo Espinosa‐Pérez, Luis Alvarez‐Icaza   +3 more
wiley   +1 more source

Benefits and Impact of Joint Metric of AOA/RSS/TOF on Indoor Localization Error

Applied Sciences, 2016
The emerging techniques in the Fifth Generation (5G) communication system, like the millimeter-Wave (mmWave) and massive Multiple Input Multiple Output (MIMO), make it possible to measure the Angle-Of-arrival (AOA), Receive Signal Strength (RSS) and Time-
Qing Jiang, Feng Qiu, Mu Zhou, Zengshan Tian   +3 more
doaj   +1 more source

Angles of Arrival Estimation with Unitary Partial Propagator

, 2013
{"references": ["Hamid Krim and Mats Viberg,\" Two Decades of Array Signal Processing Research\", IEEES Signal Processing Magazine, vol. 13, pp. 67-94, 1996.", "Schimdt, R.O, \" Multiple Emitter Location and Signal Parameter Estimation,\" IEEE Trans. On Antennas Propagation, Vol.34, No.3, March 1986,pp.276-280.", "R. Roy and T.
Khmou, Youssef, Safi, Said
openaire   +1 more source

Simple photonics-based system for Doppler frequency shift and angle of arrival measurement.

Optics Express, 2020
A novel photonic approach for simultaneously measuring both the Doppler frequency shift (DFS) and the angle of arrival (AOA) of a microwave signal in a radar system is presented.
Chongjia Huang, Hao Chen, E. Chan
semanticscholar   +1 more source

Beampattern-Based Tracking for Millimeter Wave Communication Systems

, 2016
We present a tracking algorithm to maintain the communication link between a base station (BS) and a mobile station (MS) in a millimeter wave (mmWave) communication system, where antenna arrays are used for beamforming in both the BS and MS.
Cai, Mingming, Gao, Kang, Hochwald, Bertrand, Huang, Huang, Laneman, J. Nicholas, Liu, Kunpeng, Nie, Ding   +6 more
core   +1 more source

Mechanochemical Synthesis and Characterization of Nanostructured ErB4 and NdB4 Rare‐Earth Tetraborides

Advanced Engineering Materials, Volume 27, Issue 6, March 2025.
ErB4 and NdB4 nanostructured powders are produced by mechanochemical synthesis. 5 h mechanical alloying and 4 M HCl acid leaching are used in the production. ErB4 and NdB4 powders exhibit maximum magnetization of 0.4726 emu g−1 accompanied with an antiferromagnetic‐to‐paramagnetic phase transition at about TN = 18 K and 0.132 emu g−1 with a maximum at ...
Burçak Boztemur, Faruk Kaya, Bora Derin, Mustafa Lütfi Öveçoğlu, Ju Li, Duygu Ağaoğulları   +5 more
wiley   +1 more source

Effects of spacecraft reflections on RF interferometer position location accuracy [PDF]

This report describes one of three study tasks related to the application of an RF interferometer aboard a low-orbiting spacecraft to determine the location of ground-based transmitters.
Wallace, R. G., Ward, F. C.
core   +1 more source