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An Ocean Wind Doppler Model Based on the Generalized Curvature Ocean Surface Scattering Model ArchiMer
Said, Faozi; Johnsen, Harald; Chapron, Bertrand; Engen, Geir.
A Doppler centroid D-C model based on the generalized curvature ocean surface scattering model (generalized curvature model or GCM) is presented. Two key features are included in this model: a skewness-related phase coefficient based on empirical skewness coefficients of sea-surface-slope probability density function (pdf) for wind speed less than 10 m/s and effects from wave breaking for wind speed greater than 10 m/s. Simulated D-c values are exclusively compared with the empirical geophysical Doppler model function named CDOP, for hh and vv polarizations, various wind conditions, and incidence angles. Good agreement is found overall between CDOP and simulated D-C values. The overall bias for simulated Dc-vv with and without skewness are 2.63 versus...
Tipo: Text Palavras-chave: Doppler measurements; Geophysical measurement techniques; Sea surface; Synthetic aperture radar (SAR).
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00283/39411/39116.pdf
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Radio-Frequency Interference Identification Over Oceans for C- and X-Band AMSR2 Channels ArchiMer
Zabolotskikh, Elizaveta; Mitnik, Leonid M.; Chapron, Bertrand.
A new method for radio-frequency interference (RFI) contamination identification over open oceans for the two C-subbands and X-band of Advanced Microwave Scanning Radiometer 2 (AMSR2) channel measurements is suggested. The method is based both on the AMSR2 brightness temperature (T-B) modeling and on the analysis of AMSR2 measurements over oceans. The joint analysis of T-B spectral differences allowed to identify the relations between them and the limits of their variability, which are ensured by the changes in the environmental conditions. It was found that the constraints, based on the ratio of spectral differences, are more regionally and seasonally independent than the spectral differences themselves. Although not all possible RFI combinations are...
Tipo: Text Palavras-chave: Atmosphere; Geophysical measurement techniques; Oceans; Passive microwave remote sensing; Radio-frequency interference (RFI).
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00273/38411/41989.pdf
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