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2 December 2008 Unconstrained ocean wave spectra retrieval from SAR SLC imagery
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A new approach for directional ocean wave spectra retrieval from synthetic aperture radar (SAR) single look complex (SLC) imagery is presented. This method takes the advantages of both Engen's cross spectra method and Lyzenga's unconstrained inversion method. It consists of following three main steps: (1) split-look processing and cross-spectra estimation of SLC imagery; (2) unconstrained iteration of ocean wave spectra with 180° direction ambiguity from real part of cross-spectra; (3) remove the 180° ambiguity from imaginary part of cross-spectra. Envisat ASAR data are used in cases studies. Wavelength, wave direction and significant wave height (SWH) are also derived from retrieved ocean wave spectra. Case studies with comparisons show that this method reaches better results than the one used by ESA. It can avoid the inherent error of the latter.
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Jingsong Yang, He Wang, Rong Zhang, Xiaoyan Chen, and Weigen Huang "Unconstrained ocean wave spectra retrieval from SAR SLC imagery", Proc. SPIE 7154, Microwave Remote Sensing of the Atmosphere and Environment VI, 71540D (2 December 2008);

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