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Provedor de dados:  ArchiMer
País:  France
Título:  Calibration of the Normalized Radar Cross Section for Sentinel-1 Wave Mode
Autores:  Li, Huimin
Mouche, Alexis
Stopa, Justin E.
Chapron, Bertrand
Data:  2019-03
Ano:  2019
Palavras-chave:  CMOD5.N
Radiometric calibration
Sentinel-1A (S-1A)
Wave mode (WV)
Resumo:  Sentinel-1 (S-1) is a two-satellite constellation for continuity of operational synthetic aperture radar (SAR) observations. Wave mode (WV) is the default mode over open ocean for S-1 to monitor global ocean waves and wind field. Therefore, proper radiometric calibration is essential to accurately infer these geophysical quantities. Based on the global data set acquired by S-1A WV, assessment of normalized radar cross section (NRCS) is carried out through comparison with CMOD5.N predictions over open ocean. The calibration accuracy quantified by NRCS residuals between SAR measurements and CMOD5.N demonstrates distinct features for two incidence angles (23.8° and 36.8°). Particularly, NRCS at 23.8° is overall consistent with CMOD5.N, while NRCS at 36.8° displays great deviation. Two recalibration methods are then implemented by examining the backscattering profile over Amazon rain forest and ocean calibration. Both methods show the necessity for recalibration and obtain comparable correction factors for WV1 and WV2, respectively. The NRCS residuals by applying both methods are significantly reduced toward zero. By comparison, ocean calibration is more efficient and practical to implement.
Tipo:  Text
Idioma:  Inglês

Editor:  Institute of Electrical and Electronics Engineers (IEEE)
Formato:  application/pdf
Fonte:  Ieee Transactions On Geoscience And Remote Sensing (0196-2892) (Institute of Electrical and Electronics Engineers (IEEE)), 2019-03 , Vol. 57 , N. 3 , P. 1514-1522
Direitos:  2018 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission


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