| 对ENVISAT ASAR level2算法固有误差的分析 |
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| 引用本文： | 王贺,杨劲松,黄韦艮,王隽.对ENVISAT ASAR level2算法固有误差的分析[J].海洋学报,2008,30(3):72-76. |
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| 作者姓名： | 王贺 杨劲松 黄韦艮 王隽 |
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| 作者单位： | 国家海洋局第二海洋研究所卫星海洋环境动力学国家重点实验室, 浙江杭州 310012 |
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| 摘 要： | 欧洲空间局的ENVISAT ASAR level 2算法是从合成孔径雷达(SAR)单视复图像反演涌浪方向谱的算法.该算法假设双峰海浪谱的SAR图像交叉谱是涌浪的图像交叉谱和风浪的图像交叉谱之和.实际上双峰海浪谱的SAR图像交叉谱中还有一个混合项,正是该混合项导致ENVI-SAT ASAR level 2算法有固有误差.利用遥感仿真的方法分析了不同海况条件下该算法的这一固有误差,结果表明,只有在有效波高较小、或风浪的成分较少、或双峰海浪的传播方向较靠近SAR距离向、或波长较长时固有误差才较小,ENVISAT ASAR level 2算法对海浪谱的反演才较为适用.
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| 关 键 词： | 合成孔径雷达 海浪谱 ENVISATASARlevel2算法 误差分析 |
| 收稿时间： | 2007/2/12 0:00:00 |
| 修稿时间： | 2008/3/17 0:00:00 |
Analysis on intrinsic error of ENVISAT ASAR level 2 algorithm |
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| WANG He,YANG Jing-song,HUANG Wei-gen and WANG Jun.Analysis on intrinsic error of ENVISAT ASAR level 2 algorithm[J].Acta Oceanologica Sinica (in Chinese),2008,30(3):72-76. |
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| Authors: | WANG He YANG Jing-song HUANG Wei-gen and WANG Jun |
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| Institution: | State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| 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. |
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| Keywords: | synthetic aperture radar ocean wave spectra ENVISAT ASAR level 2 algorithm error analysis |
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