Results 51 to 60 of about 598 (182)
Knowledge-Based Multitarget Ship Tracking for HF Surface Wave Radar Systems [PDF]
IEEE Transactions on Geoscience and Remote Sensing, 2015 These last decades spawned a great interest toward low-power high-frequency (HF) surface-wave (SW) radars for ocean remote sensing. By virtue of their over-the-horizon coverage capability and continuous-time mode of operation, these sensors are also effective long-range early warning tools in maritime situational awareness applications providing an ...
Gemine Vivone +2 more
openaire +3 more sources
How the 29 July 2025 M8.8 Kamchatka Earthquake Shook the Ionosphere Over Japan
Journal of Geophysical Research: Space Physics, Volume 131, Issue 7, July 2026.Abstract This study investigates the mid‐field (∼1,100–3,800 km) ionospheric response to the 29 July 2025 Kamchatka earthquake over Japan using multi‐instrument observations, raytracing, and numerical simulations. Total electron content (TEC) observations from GPS satellite G04 and Galileo satellite E10 show a maximum TEC perturbation of ∼0.5–0.85 TECU
R. K. Barad +5 more
wiley +1 more source
Performance Investigation of Four Ionospheric Models in Estimating hmF2 in High‐Latitude Regions
Space Weather, Volume 24, Issue 7, July 2026.Abstract As a critical parameter characterizing the vertical structure of the ionosphere, the peak height of the F2 layer (hmF2) plays an essential role in frequency selection and signal propagation in high‐frequency (HF) communication systems. Accurate prediction of hmF2 is particularly important in high‐latitude regions.
T. Y. Li +5 more
wiley +1 more source
Cyclic Olefin Copolymers as Versatile Materials for Advanced Engineering Applications
Advanced Functional Materials, Volume 36, Issue 47, 11 June 2026.Cyclic olefin copolymers (COCs) are presented as highly versatile materials combining tunable synthesis, excellent optical properties, and mechanical robustness. Their potential spans microfluidics, bioengineering, and advanced electronics, while emerging self‐healing and sustainable solutions highlight future opportunities.
Giulia Fredi +3 more
wiley +1 more source
A New Method of Wave Mapping with HF Radar
International Journal of Antennas and Propagation, 2016 Study of wave height inversion with High-Frequency Surface Wave Radars (HFSWRs) has been going on for more than 40 years. Various wave inversion methods have been proposed, and HFSWRs have achieved great success in local wave measurements.
Lijie Jin, Biyang Wen, Hao Zhou
doaj +1 more source
Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain
Advanced Materials, Volume 38, Issue 32, 8 June 2026.A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha +14 more
wiley +1 more source
IET Radar, Sonar & NavigationVirtual aperture extension of small aperture array has attracted wide attention in high‐frequency surface wave radar (HFSWR). A biologically inspired coupled (BIC) system is employed to virtually extend the array aperture.
Hongbo Li +4 more
doaj +1 more source
2D Materials Empowered Radar Absorbing Materials: A Review
Advanced Electronic Materials, Volume 12, Issue 12, 22 June 2026.Recent progress in 2D materials empowered radar absorbing materials (RAMs) is reviewed, highlighting four key structural design strategies that enhance electromagnetic wave absorption. Porous structures, heterogeneous interfaces, printed metamaterials, and tunable metasurfaces are compared in terms of their governing physics, fabrication complexity ...
Yujie Zhong +4 more
wiley +1 more source
Japan Tsunami Current Flows Observed by HF Radars on Two Continents
Remote Sensing, 2011 Quantitative real-time observations of a tsunami have been limited to deep-water, pressure-sensor observations of changes in the sea surface elevation and observations of sea level fluctuations at the coast, which are essentially point measurements ...
Toshiyuki Awaji +6 more
doaj +1 more source
Wind Turbine Clutter Mitigation in Coastal UHF Radar
The Scientific World Journal, 2014 Coastal UHF radar provides a unique capability to measure the sea surface dynamic parameters and detect small moving targets, by exploiting the low energy loss of electromagnetic waves propagating along the salty and good conducting ocean surface.
Jing Yang +4 more
doaj +1 more source