Analysis on intrinsic error of ENVISAT ASAR level 2 algorithm

WANG He; YANG Jing-song; HUANG Wei-gen; WANG Jun

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WANG He, YANG Jing-song, HUANG Wei-gen, WANG Jun. Analysis on intrinsic error of ENVISAT ASAR level 2 algorithm[J]. Haiyang Xuebao, 2008, 30(3): 72-76.

Citation:

WANG He, YANG Jing-song, HUANG Wei-gen, WANG Jun. Analysis on intrinsic error of ENVISAT ASAR level 2 algorithm[J]. Haiyang Xuebao, 2008, 30(3): 72-76.

WANG He, YANG Jing-song, HUANG Wei-gen, WANG Jun. Analysis on intrinsic error of ENVISAT ASAR level 2 algorithm[J]. Haiyang Xuebao, 2008, 30(3): 72-76.

Citation:

WANG He, YANG Jing-song, HUANG Wei-gen, WANG Jun. Analysis on intrinsic error of ENVISAT ASAR level 2 algorithm[J]. Haiyang Xuebao, 2008, 30(3): 72-76.

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Analysis on intrinsic error of ENVISAT ASAR level 2 algorithm

State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2007-02-12
Rev Recd Date: 2008-03-17

Abstract

Abstract

ENVISAT ASAR level 2 algorithm developed by the European Space Agency(ESA) provides directional ocean wave spectra retrieved from synthetic aperture radar(SAR) single look complex data.This inversion algorithm is based on approximating the total SAR cross-spectrum as a sum of a quasilinear part due to the swell and a nonlinear part due to the wind sea.How ever,this assumptionomits a mixed term which brings the intrinsic error to the ENVISAT ASAR level 2 algorithm.Ananalysis is made on the intrinsic error by inverting the simulated SAR cross-spectra using the EN VISAT ASAR level 2 algo rithm.The dependence of the intrinsic error on the ocean wave condition is discussed.It is shown that the ENV-I SAT ASAR level 2 algo rithm can provide the accept able results only when the ocean waves have a smaller significant wave height,or a smaller wind wave component,or a wave direction closer to the SAR range direction,or a longer wavelength.
- synthetic aperture radar,
- ocean wave spectra,
- ENVISAT ASAR level 2 algorithm,
- error analysis

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References(7)

References

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KERBAOL V,JOHNSEN H,CHAPRON B,et al.Quality assessment of ENVISAT ASAR wave mode products based on regional and seasonal comparisons with WAM model outputs[C/CD]//Proc 2004 Envisat & ERS Symposium.Noordwijk:ESA Publications Division,2005.

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