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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >The consequences of sampling variability on the estimation of wave number and propagation direction from spaceborne SAR image spectra
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The consequences of sampling variability on the estimation of wave number and propagation direction from spaceborne SAR image spectra

机译：采样变异性对星载SAR图像谱估计波数和传播方向的影响

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摘要

Even if it were true that SAR (synthetic aperture radar) ocean surface imagery provides a perfect noiseless representation of ocean surface wave height, each spectrum computed from such imagery would be but a single realization of the ensemble-mean ocean spectrum. There would be sampling variability associated with the parameters of dominant wave number and propagation direction extracted from such a spectrum. The present study addresses two questions: (i) what statistical distribution is applicable to the spectra of SAR ocean images? and (ii) what are the consequences of such statistics on the precision with which wave number and propagation direction can be extracted? An examination is made of spectra computed from ocean imagery acquired during the SIR-B (Shuttle Imaging Radar-B) mission.
机译：即使SAR（合成孔径雷达）海面影像确实提供了海面波高的完美无噪声表示，从这样的影像中计算出的每个光谱也只是集成平均海洋光谱的一个实现。将存在与从这样的频谱提取的主波数和传播方向的参数相关的采样变异性。本研究解决了两个问题：（i）什么样的统计分布适用于SAR海洋图像的光谱？ （ii）这些统计数字对提取波数和传播方向的精度有何影响？检查了从在SIR-B（航天飞机成像雷达B）任务期间获取的海洋图像计算得出的光谱。

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