DocumentCode :
58684
Title :
C-Band Satellite Scatterometer Intercalibration
Author :
Elyouncha, A. ; Neyt, X.
Author_Institution :
Dept. of Commun., Inf., Syst. & Sensors, R. Mil. Acad., Brussels, Belgium
Volume :
51
Issue :
3
fYear :
2013
fDate :
Mar-13
Firstpage :
1478
Lastpage :
1491
Abstract :
A methodology of intercalibration of C-band spaceborne scatterometers is developed and applied to European Remote Sensing satellite-1 (ERS-1), European Remote Sensing satellite-2 (ERS-2), and Meteorological Operational satellite (METOP) scatterometer data. Assuming that the differences between the instruments can be represented by an incidence-angle-dependent bias, this paper presents and discusses four methods, providing an estimate of that bias and of its standard deviation. Model-based methods performed more accurately than a direct comparison of σ0. The latter provides a systematic larger positive bias. The methodology is applied to ERS-1 and ERS-2 data acquired during the tandem mission in 1996. The same methodology is applied to ERS-2 and Advanced Scatterometer (ASCAT) data acquired in December 2008. Generally, the bias between the ERS-1 and ERS-2 scatterometers is smaller than 0.2 dB over most incidence angles, and the four methods provide relatively consistent results. The bias between ERS-2 and ASCAT is slightly higher, reaching 0.4 dB at certain incidence angles. These results suggest that these scatterometers need to be intercalibrated to achieve a consistent backscatter data.
Keywords :
artificial satellites; meteorological instruments; remote sensing; C-band satellite scatterometer; European remote sensing satellite-1; European remote sensing satellite-2; incidence-angle-dependent bias; intercalibration; meteorological operational satellite; model-based methods; scatterometer data; Backscatter; Instruments; Oceans; Radar measurements; Satellites; Spaceborne radar; Wind; ASCAT; ERS; calibration; radar remote sensing; scatterometer; sea ice; sea surface; spaceborne radar;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/TGRS.2012.2217381
Filename :
6334446
Link To Document :
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