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《Chinese Journal of Geophysics》 2013-01
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Regularization inversion method for extracting ocean wave spectra from HFSWR sea echo

LI Lun,WU Xiong-Bin*,LONG Chao,LIU Bin Electronic Information Institute of Wuhan University,Wuhan 430072,China  
HFSWR(High Frequency Surface Wave Radar) is capable of all-weather remote sensing of large area ocean surface dynamics(currents,wind and wave) with relatively high precision.Its capability of currents detection has been considered satisfying the requirements for routine marine observations while its wind and wave outputs have not reached the matched status.The second-order Doppler spectra of the HFSWR sea echoes contain ocean wave spectra information.This paper proposes a new method for extracting ocean wave spectra from the Doppler spectra with HFSWR.The method is developed by introducing a regularization mathematics model to the discrete linearization of the integral equation based on the principle of HF radio wave ocean detecting.Solution of the discrete linearization of the integral equation is obtained by singular value decomposition(SVD) method,while the regularization parameter is determined by L-Curve.Validity and accuracy of the proposed method are demonstrated by numerical simulation with different noise levels both at single radar and two radars of the same coverage detecting which show good agreement: Non-directional spectra can be extracted from single radar and directional spectra can be obtained by two radars at the same coverage.Some preliminary results from measured data detected by HFSWR OSMAR071 located at Longhai of Fujian province are also introduced.Further study is needed for the practical use of this method.It is promising for HFSWR wave inversion in future applications.
【Fund】: 国家高技术发展研究计划(863计划)(2009AA09A301 2012AA091701);; 国家自然科学基金(60571065)资助
【CateGory Index】: P716
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