Results 51 to 60 of about 645 (179)

Overview of ionosphere clutter suppression for high frequency surface wave radar (HFSWR) system: Observation, approaches, challenges and open issue

IET Radar, Sonar & Navigation, 2023
A great interest has been directed towards high frequency surface wave radar (HFSWR), because it is applied as long‐range early warning and real‐time measurements of sea surface condition tools in maritime surveillance.
Xiaowei Ji, Xiaochuan Wu, Qiang Yang, Xin Zhang   +3 more
doaj   +1 more source

Seismo‐ and Tsunami‐Traveling Ionospheric Disturbances of the 29 July 2025 M8.8 Kamchatka Earthquake Observed by CW‐HF Doppler Sounding Systems and Ionosondes in Taiwan and Japan

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Doppler frequency shifts (DFSs) recorded by continuous wave‐high frequency Doppler sounding systems and ionograms observed by five ionosondes in Taiwan and Japan are used to study three‐dimensionally seismo‐ and tsunami‐traveling ionospheric disturbances (STIDs and TTIDs) triggered by the 29 July 2025 Mw8.8 Kamchatka earthquake.
Yao‐Chun Chen, Jann‐Yenq Liu, Tien‐Chi Liu, Katsumi Hattori, Jaroslav Chum, Chieh‐Hung Chen, Wen‐Yen Chang, Bor‐Shouh Huang, Rui Song, Horng‐Yuan Yen   +9 more
wiley   +1 more source

Liquid Metals in Radio Frequency Applications: A Review of Physics, Manufacturing, and Emerging Technologies

Advanced Electronic Materials, Volume 12, Issue 16, 24 August 2026.
This paper reviews the physics of liquid metals in RF devices, including the influence of mechanical strain on resonance as well as fabrication methods and strategies for designing tunable and strain‐tolerant inductors, capacitors, and antennas.
Md Saifur Rahman, William J. Scheideler
wiley   +1 more source

Signal Data Stream Parameters Passing Ionospheric Communication Links With Fading Caused by Natural Clutter Phenomena

Radio Science, Volume 61, Issue 8, August 2026.
Abstract This paper explores the impact of natural phenomena on signal data transmission across various ionospheric communication channels. The study focuses on three primary phenomena: meteor trails prevalent in the middle‐ and lower‐latitude ionosphere, bubble and plume structures observed around the equatorial ionosphere, and magnetic‐storm‐induced ...
I. Bronfman, Y. Ben‐Shimol, N. Blaunstein   +2 more
wiley   +1 more source

Combination of the biologically inspired coupled system and high‐frequency surface wave radar at signal level

IET Radar, Sonar & Navigation
Virtual 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, Aijun Liu, Qiang Yang, Changjun Yu, Zhe Lyv   +4 more
doaj   +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

Active Tectonics of the Eastern and Southern Alps ‐ Crustal Response to Deep Processes? A Review

Tectonics, Volume 45, Issue 8, August 2026.
Abstract Owing to the low N‐S convergence rates between Adria and Europe, crustal deformation rates in the Alps and its forelands are low. Active tectonics are, therefore, difficult to study, especially as non‐tectonic landscape forming processes can erase or modify the tectonic surface imprint. Large‐scale and dense seismological data recently offered
Christoph Grützner, Gesa Petersen, Enrico Serpelloni, Sabrina Metzger, Jasper Moernaut, Kamil Ustaszewski, Jacek Szczygieł, Petra Jamšek Rupnik, Azam Jozi Najafabadi, Ajay Kumar, Andrea Piccolo, Blaž Vičič, Simone Cesca, Esther Hintersberger, Laurens Jan Hofman, Jörn Kummerow, Erick Prince, Klaus Reicherter, Christian Schuler, Gregor Rajh, Marcel Thielmann   +20 more
wiley   +1 more source

PyRayHF: An Open Source Ray‐Tracing Forward Operator for Assimilating Oblique Ionograms

Radio Science, Volume 61, Issue 8, August 2026.
Abstract Oblique high‐frequency (HF) ionospheric measurements contain valuable information about electron density structure, but remain difficult to assimilate operationally due to the computational cost of ray tracing. PyRayHF is an open‐source, fully Python‐based framework that addresses such difficulties through the implementation of efficient ...
Victoriya V. Forsythe, Henry C. Valentine, Douglas P. Drob, Joseph Hughes, Dustin Hickey, Angeline G. Burrell, Katherine A. Zawdie, Dev Raj Joshi, William Bristow, Evan G. Thomas   +9 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, John Largier, Newell Garfield, Yoichi Ishikawa, Donald Barrick, Sei-Ichi Saitoh, Belinda Lipa   +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, Chao Pan, Caijun Wang, Dapeng Jiang, Biyang Wen   +4 more
doaj   +1 more source