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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Accuracy of scatterometer-derived winds using the Cramer-Rao bound
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Accuracy of scatterometer-derived winds using the Cramer-Rao bound

机译：使用Cramer-Rao界线的散射计派生风的精度

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摘要

A wind scatterometer makes measurements of the normalized radar-backscatter coefficient /spl sigma//spl deg/ of the ocean surface. To retrieve the wind, a geophysical model function (GMF), which relates /spl sigma//spl deg/ to the near-surface wind, is used. The wind vector can be estimated using maximum-likelihood techniques from several /spl sigma//spl deg/ measurements made at different azimuth angles. The probability density of the measured /spl sigma//spl deg/ is assumed to be Gaussian with a variance that depends on the true /spl sigma//spl deg/ and therefore, depends on the wind through the GMF. With this model for wind estimation, the Cramer-Rao (C-R) bound is derived for wind estimation, and its implications for wind retrieval are discussed. As part of this discussion, the role of geophysical modeling error is considered and shown to play a significant role in the performance of near-surface wind estimates. The C-R bound is illustrated using parameters from the ERS AMI, NSCAT, and Sea Winds scatterometers.
机译：风散射仪测量海面的归一化雷达后向散射系数/ spl sigma // spl deg /。为了获取风，使用了地球物理模型函数（GMF），该函数将/ spl sigma // spl deg /与近地表风相关。可以使用最大似然技术，根据在不同方位角下进行的几个/ spl sigma // spl deg /测量值估算风向。假定测得的/ spl sigma // spl deg /的概率密度为高斯，其方差取决于真实的/ spl sigma // spl deg /，因此取决于通过GMF的风。利用该模型进行风估计，推导了Cramer-Rao（C-R）边界用于风估计，并讨论了其对风检索的意义。作为讨论的一部分，考虑了地球物理建模误差的作用，并证明其在近地表风估计的执行中起着重要作用。使用ERS AMI，NSCAT和Sea Wind散射仪的参数说明了C-R界限。

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