NDLI: Error analysis of Envisat ASAR level 2 algorithm based on simulation technique

Content Provider	IEEE Xplore Digital Library
Author	Jingsong Yang He Wang Weigen Huang Qingmei Xiao
Copyright Year	2007
Description	Author affiliation: Second Inst. of Oceanogr., Hangzhou (Jingsong Yang; He Wang; Weigen Huang; Qingmei Xiao)
Abstract	In ESA's Envisat ASAR level 2 algorithm, it is assumed that the synthetic aperture radar (SAR) image cross spectra of mixed ocean waves were the summation of SAR image cross spectra of wind waves and that of swells. But our previous studies show that in addition to this, the cross spectra of mixed waves consist of an extra term (see the companion paper submited to this symposium). Just this term leads to an inherent error of this algorithm which has not been considered yet. This paper presents an error analysis of Envisat ASAR level 2 algorithm for ocean wave spectra retrieval in different significant wave height, wavelength, wave direction and wave component conditions based on simulation technique. It shows that the inherent errors (1) change with above parameters, and are always positive which mean the retrieved ocean wave height are overestimated; (2) increase for larger significant wave height; (3) increase for smaller wavelength; (4) increases for smaller propagation angle respect to azimuth direction. (5) increase for more wind wave component. Therefore, Envisat ASAR level 2 algorithm only works in small wave height, or large wavelength, or large propagation angle, or few wind wave component conditions.
Starting Page	1409
Ending Page	1411
File Size	1286463
Page Count	3
File Format	PDF
ISBN	9781424412112
DOI	10.1109/IGARSS.2007.4423070
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-07-23
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Error analysis Analytical models Ocean waves Polarization Flowcharts Synthetic aperture radar Azimuth Information retrieval Image retrieval Helium simulation SAR Envisat ASAR algorithm error analysis
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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