Results 21 to 30 of about 3,734 (258)
Sensors, 2022 The optimization of normalized radar cross-section (NRCS) sampling by a scatterometer allows an increase in the accuracy of the wind retrieval over the water surface and a decrease in the time of the measurement.
Alexey Nekrasov +2 more
doaj +1 more source
DDM-Former: Global Ocean Wind Speed Retrieval with Transformer Networks [PDF]
IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium, 2023 As a novel remote sensing technique, GNSS reflectometry (GNSS-R) opens a new era of retrieving Earth surface parameters. Several studies employ the combination of deep learning and GNSS-R observable delay-Doppler maps (DDMs) to generate ocean wind speed estimation.
Zhao, Daixin +7 more
openaire +3 more sources
Uncertainty model for dual-Doppler retrievals of wind speed and wind direction [PDF]
, 2020 Abstract. In this paper we present an analytical model for estimating the uncertainty of the horizontal wind speed based on dual-Doppler lidar measurements. The model follows the propagation of uncertainties method and takes into account the uncertainty of radial velocity estimation, azimuth and elevation pointing angles, and ranging.
Nikola Vasiljević +2 more
openaire +2 more sources
Optimal Interpolation Model for Synthetic Aperture Radar Wind Retrieval
Frontiers in Earth Science, 2020 The variational model inversion (VAR) method for synthetic aperture radar (SAR) wind retrieval based on the Bayesian theory can overcome the limitations of the traditional wind streak algorithm by introducing background wind and considering all sources ...
Wei Zhang +4 more
doaj +1 more source
IEEE Access, 2020 The sea surface temperature (SST) actively impacts the backscattering coefficient measured by scatterometers and the wind retrieval accuracy. However, none of the geophysical model functions (GMFs) currently used in operational wind retrieval considers ...
Yihuan Peng +4 more
doaj +1 more source
Comparison of sar wind speed retrieval algorithms for evaluating offshore wind energy resources [PDF]
Journal of maritime researches, 2010 Envisat/ASAR-derived offshore wind speeds and energy densities based on 4 different SAR wind speed retrieval algorithms (CMOD4, CMOD-IFR2, CMOD5, CMOD5.N) are compared with observed wind speeds and energy densities for evaluating offshore wind energy resources.
Kozai, Katsutoshi +6 more
openaire +1 more source
Wind Direction Retrieval Using Spaceborne GNSS-R in Nonspecular Geometry
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020 A wind direction retrieval algorithm using spaceborne global navigation satellite system reflectometry (GNSS-R) in nonspecular geometry is presented. This article first focuses on investigating the influence of wind direction on the scattering strength ...
Guodong Zhang +3 more
doaj +1 more source
Wind Direction Signatures in GNSS-R Observables from Space
Remote Sensing, 2018 Wind speed and direction are important essential climate variables (ECVs). GNSS-R is an emerging remote sensing technique that can be potentially used to retrieve wind speed from space.
Dongliang Guan +6 more
doaj +1 more source
Improving Altimeter Wind Speed Retrievals Using Ocean Wave Parameters [PDF]
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020 Spaceborne altimeters are an important data source for obtaining global sea surface wind speeds (U10). Although many altimeter U10 algorithms have been proposed and they perform well, there is still room for improvement. In this study, the data from ten altimeters were collocated with buoys to investigate the error of the altimeter U10 retrievals.
Haoyu Jiang, Hao Zheng, Lin Mu 0004
openaire +4 more sources
Wind speed retrieval using GNSS-R technique with geographic partitioning
Satellite Navigation, 2023 In this paper, the effect of geographical location on Cyclone Global Navigation Satellite System (CYGNSS) observables is demonstrated for the first time.
Zheng Li +4 more
doaj +1 more source