Results 41 to 50 of about 242,024 (339)
A Compact Maritime Harmonic Radar Antenna for Navigation and Search-and-Rescue
IEEE AccessThis paper presents a compact dual-band dual-polarized slotted waveguide array antenna designed for a maritime harmonic search-and-rescue system. The harmonic radar transmits signals in the S-band and receives clutter-free signals in the C-band through ...
Taher Badawy +2 more
doaj +1 more source
The first operation and results of the Chung-Li VHF radar [PDF]
, 1986 The Chung-Li Very High Frequency (VHF) radar is used in the dual-mode operations, applying Doppler beam-swinging as well as the spaced-antenna-drift method. The design of the VHF radar is examined.
Chao, J. K. +5 more
core +1 more source
A compact lightweight multipurpose ground-penetrating radar for glaciological applications
, 2011 We describe a compact lightweight impulse radar for radio-echo sounding of subsurface structures designed specifically for glaciological applications. The radar operates at frequencies between 10 and 75 MHz.
Frolovskiy, K. +4 more
core +2 more sources
Advanced Healthcare Materials, EarlyView.This review highlights recent advances in smart face masks that actively monitor breathing. By integrating humidity, gas, temperature, pressure, strain, and triboelectric sensors, these masks track key respiratory parameters in real time. The article summarizes sensor mechanisms, compares performance across studies, and discusses challenges and future ...
Negin Faramarzi +7 more
wiley +1 more source
IET Radar, Sonar & NavigationRadar systems are evolving towards distributed receiver networks. As individual stations might be separated too far to install a cable link, novel methods are required to synchronise individual data records in the time domain.
Erik Busley +3 more
doaj +1 more source
Comparison of reflectivity and wind profiles measured on 46.8 MHz and 430 MHz at the Arecibo Observatory [PDF]
, 1986 Comparisons of troposphere and stratosphere radar experiments at ultrahigh frequency (UHF) and very high frequency (VHF) were done at the Arecibo Observatory in April 1980 with the 430 MHz and 46.8 MHz radar.
Rottger, J.
core +1 more source
Superresolution for high-frequency radar
IET Radar, Sonar & Navigation, 2007 High-frequency (HF) radars require large-array antennas to achieve narrow beamwidths and are required to discriminate targets with low Doppler shifts compared with microwave radar. Superresolution processing can discriminate signals at separations much less than the beamwidth or conventional Doppler bin width (or conversely, achieve a given minimum ...
openaire +1 more source
Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain
Advanced Materials, EarlyView.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
SensorsTime synchronization and positioning of bistatic radar transceivers is required to coordinate and meaningfully merge the measurements made between them. It simultaneously allows the radar transceivers to change their position throughout time.
Ferran Valdes Crespi +4 more
doaj +1 more source
RADAR ON RAIA: High frequency radars in the RAIA Observatory
, 2021 The RADAR ON RAIA project aims to update and extend beyond the Galician border the High Frequency (HF) radar network that has been operating since 2011 in the framework of the RAIA Observatory. The Project is allowing the establishment of a cross-border collaboration beyond the physical infrastructure itself, developing a sharing strategy of ...
Piedracoba Varela, Silvia +22 more
openaire +2 more sources