Results 271 to 280 of about 56,958 (289)
Some of the next articles are maybe not open access.
IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020
Microwave remote sensing plays an important role in monitoring the sea surface oil spill, but it has some shortcomings in monitoring oil film thickness. Many scholars have done a lot of work for this. At present, optics, laser and ultraviolet have made some breakthroughs in the study of oil film thickness; In particular, Hyperspectral shows great ...
Jie Guo +3 more
openaire +1 more source
Microwave remote sensing plays an important role in monitoring the sea surface oil spill, but it has some shortcomings in monitoring oil film thickness. Many scholars have done a lot of work for this. At present, optics, laser and ultraviolet have made some breakthroughs in the study of oil film thickness; In particular, Hyperspectral shows great ...
Jie Guo +3 more
openaire +1 more source
Calibration of a miniaturized FMCW ATI-SAR for normalized radar cross section measurement
2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2015A radiometric calibration scheme that exploits time-domain backprojection is evaluated using a squinted frequency-modulated continuous wave radar and corner reflectors. We find that the calibration scheme compensates for most of the variation in image intensity due to changes in aircraft attitude, and that for good signal to clutter ratios, the return ...
Gordon Farquharson +2 more
openaire +1 more source
An Evaluation of NOAA CyGNSS Winds Derived from v3.0 CyGNSS Normalized Bistatic Radar Cross Section
2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021The NOAA track-wise algorithm, used to infer sea surface wind speed from CyGNSS normalized bistatic radar cross section (NBRCS), is being used in conjunction with v3.0 NBRCS. A performance analysis is provided where NOAA CyGNSS winds derived from v2.1 NBRCS are compared with those derived from v3.0 NBRCS, using available data from August 2018 to ...
Faozi Saïd +2 more
openaire +1 more source
The variance of the normalized radar cross section of the sea
Journal of Geophysical Research: Oceans, 1991The dependence of the variance of the normalized radar cross section of the sea, , on illuminated area and integration time is investigated. We show that the standard expression for this dependence cannot account for the correlation of power received from different points on the surface which is exhibited by microwave backscatter from the sea.
openaire +1 more source
Normalized radar cross section of the sea for backscatter: 2. Modulation by internal waves
Journal of Geophysical Research: Oceans, 2010We report measurements of microwave surface signatures of internal waves with dual‐polarized, coherent, X band radars mounted on three ships and an airplane. In shipboard measurements in the South China Sea, internal waves generally increased the backscattering cross section near the peaks of the internal waves with little detectable decrease afterward.
William J. Plant +4 more
openaire +1 more source
Normalized radar cross section analysis of oil-contaminated young Sea ice
2016 USNC-URSI Radio Science Meeting, 2016Oil spills may be detected in ice-covered waters through the observed changes in its normalized radar cross section (NRCS) data. In this paper, the NRCS sensitivity to the presence of an oil layer beneath the young sea ice is investigated for various sea ice versus oil layer thicknesses.
Nariman Firoozy +4 more
openaire +1 more source
Modeling Normalized Radar Cross-Section of Oil-contaminated Sea Ice with Small Perturbation Method
2021 IEEE 19th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM), 2021In this paper, we present a study of scattering from oil-contaminated sea ice. We utilized five dielectric mixture models to model clean and oil-contaminated sea ice with two types of oil products (crude oil and marine ship diesel) with 5% contamination by volume fraction. For the scattering approach, we utilized the Small Perturbation Method, SPM, and
Amirbahador Mansoori +3 more
openaire +1 more source
IEEE Transactions on Antennas and Propagation, 2015
A wideband radar cross section (RCS) reduction measure applicable to rod-like targets is proposed. This technique uses the differences in radii among multistep cylindrical structures to create a phase reversal for backscattering cancelation. In order to broaden the reduction bandwidth, a simple one-step design is evolved into a multistep one using the ...
Shin-Hon Chen +2 more
openaire +1 more source
A wideband radar cross section (RCS) reduction measure applicable to rod-like targets is proposed. This technique uses the differences in radii among multistep cylindrical structures to create a phase reversal for backscattering cancelation. In order to broaden the reduction bandwidth, a simple one-step design is evolved into a multistep one using the ...
Shin-Hon Chen +2 more
openaire +1 more source
Normalized Radar Cross Section of Natural Surfaces at Millimeter Wavelengths
1991Abstract : This report describes the results of research of polarimetric radar measurements performed at 95 GHz and 225 GHz by the University of Massachusetts. The targets included various tree species and snow scenes.
openaire +1 more source
The Effect of Limiting upon the Mean Cross Section of Log-Normal Radar Clutter
IEEE Transactions on Aerospace and Electronic Systems, 1973A log-normal variate is described by its median value and by the standard deviation of In(?c/?m), where ?c is the variate and ?m is its median value. For radar applications, the mean value of the variate is useful, and this correspondence derives the effect upon the mean value of various degrees of limiting.
openaire +1 more source