Results 41 to 50 of about 56,958 (289)

SAR Image Generation of Ocean Surface Using Time-Divided Velocity Bunching Model [PDF]

Journal of the Korean Institute of Electromagnetic Engineering and Science, 2019
An efficient synthetic aperture radar (SAR) image formulation based on the velocity-bunching model is proposed for a large SAR image integration time. A time-varying ocean surface is generated based on the semi-empirical spectrum proposed by Fung and Lee.
Jae-Won Rim, Il-Suek Koh
doaj   +1 more source

Forward scatter radar for air surveillance: Characterizing the target-receiver transition from far-field to near-field regions [PDF]

, 2017
A generalized electromagnetic model is presented in order to predict the response of forward scatter radar (FSR) systems for air-target surveillance applications in both far-field and near-field conditions.
Comite, Davide, Falconi, Marta Tecla, Galli, Alessandro, Lombardo, Pierfrancesco, Marzano, FRANK SILVIO, Pastina, Debora   +5 more
core   +2 more sources

Sea Wind Measurement by Doppler Navigation System with X-Configured Beams in Rectilinear Flight

Remote Sensing, 2017
We suggest a conceptual approach to the measurement of the near-surface wind vector over water using a Doppler navigation system, in addition to its standard navigation capabilities. We consider a Doppler navigation system with a track-stabilized antenna
Alexey Nekrasov, Alena Khachaturian, Mária Gamcová, Pavol Kurdel, Viktor Obukhovets, Vladimir Veremyev, Mikhail Bogachev   +6 more
doaj   +1 more source

Tropical Cyclone Winds Retrieved From Synthetic Aperture Radar [PDF]

Oceanography, 2013
This paper describes algorithms used to retrieve high-resolution wind fields in tropical cyclone conditions from synthetic aperture radar (SAR) data acquired at C-band with either co-polarization or cross-polarization.
General Dynamics Advanced Information Systems, Christopher Wackerman, Jochen Horstmann, Salvatore Maresca   +3 more
doaj   +1 more source

ANALYTICAL FORMULAE FOR RADAR CROSS SECTION OF FLAT PLATES IN NEAR FIELD AND NORMAL INCIDENCE [PDF]

Progress In Electromagnetics Research B, 2008
Radar Cross Section is most of the time defined in far field. In that case, RCS is totally independent of the range between the radar and the target. However, in several kinds of military scenario, it can be more realistic to deal with the target nearfield scattering characteristics.
Philippe Pouliguen, Régis Hémon, Christophe Bourlier, Jean-Francois Damiens, Joseph Saillard   +4 more
openaire   +1 more source

Retrieval of the two-dimensional slope field by the SWIM spectrometer of the CFOSAT satellite: discussion of the algorithm

Russian Journal of Earth Sciences, 2022
In October 2018, the Chinese-French satellite CFOSAT was launched into low-earth orbit, which carries the French SWIM spectrometer and the Chinese scatterometer RFSCAT. The SWIM (Ku-band) spectrometer measures the normalized radar cross section (NRCS) at
Karaev Vladimir, Panfilova M., Ryabkova M., Titchenko Yu., Meshkov E., Li X.   +5 more
doaj   +1 more source

Normalized Radar Scattering Section Simulation and Numerical Calculation of Freak Wave

Journal of Marine Science and Engineering, 2022
The improved phase modulation method is used to numerically simulate a two-dimensional freak wave. While generating freak waves at specific positions, the spectral structure of the target spectrum can also be maintained, and the statistical ...
Gengkun Wu, Bin Liu, Lichen Han
doaj   +1 more source

Machine Learning‐Assisted Inverse Design of Soft and Multifunctional Hybrid Liquid Metal Composites

Advanced Functional Materials, EarlyView.
A machine learning framework is presented for inverse design of synthesizable multifunctional composites containing both liquid metal and solid inclusions. By integrating physics‐based modeling, data‐driven prediction, and Bayesian optimization, the approach enables intelligent design of experiments to identify optimal compositions and realize these ...
Lijun Zhou, Yunsik Ohm, Ren‐Mian Chin, Olivia Kerr, Krithika Manohar, Mohammad H. Malakooti   +5 more
wiley   +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, Bilguun Nurzed, Mostafa Berangi, Andre Kuehne, Helmar Waiczies, Igor Fabian Tellez Ceja, Xiang Hu, Thomas Gladytz, Lisa Krenz, Dave Huebler, Beate Endemann, Claudia Brockmann, Ebba Beller, Oliver Stachs, Thoralf Niendorf   +14 more
wiley   +1 more source

Sea Ice Detection Method Using the Dependence of the Radar Cross-Section on the Incidence Angle

Remote Sensing
The method for sea ice detection using the data from the Dual-frequency Precipitation Radar (DPR) onboard the Global Precipitation Measurement (GPM) satellite data is suggested. The approach is based on the analysis of the shape of normalized radar cross-
Maria Panfilova, Vladimir Karaev
doaj   +1 more source