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首页> 外文期刊>Geoscience and Remote Sensing Letters, IEEE >Improving the Intercalibration of $sigma^{0}$ Values for the Jason-1 and Jason-2 Altimeters
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Improving the Intercalibration of $sigma^{0}$ Values for the Jason-1 and Jason-2 Altimeters

机译：改善Jason-1和Jason-2高度计的$ sigma ^ {0} $值的相互校准

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摘要

The normalized backscatter from a radar altimeter $sigma^{0}$ is a measure of the surface roughness at scales of a few radar wavelengths; over the ocean, this is used to infer wind speed. Long-term studies of wind speed rely on consistent measurements within an altimetric mission and good intercalibration between missions. For the Jason-1 and Jason-2 altimeters, the derivation of $sigma^{0}$ from the full waveform data is known to be sensitive to the recovered value for $psi^{2}$, a term encompassing both mispointing and inhomogeneities within the altimetric footprint. The six months of data from the Jason-1/2 tandem mission reveal that different $sigma^{0}$ corrections are needed for these two causes of nonzero $psi^{2}$ values. With these corrections implemented, the rms difference of ${rm K}_{rm u}$ -band $sigma^{0}$ values for Jason-1 and Jason-2 drops from 0.15 to 0.05 dB, with the bias between the two showing a clear trend with wind speed; Jason-1 being 0.04 dB greater in high winds but 0.19 dB greater in low winds. No clear change in offset is noted during the six months of overlapping data. Implementation of this correction will improve consistency of Jason-1 $ sigma^{0}$ values and may impact on orbit-fitting procedures.
机译：来自雷达高度计$ sigma ^ {0} $的归一化反向散射是在几个雷达波长范围内的表面粗糙度的量度；在海洋上，这用于推断风速。风速的长期研究依赖于高空任务中的一致测量以及任务之间的良好相互校准。对于Jason-1和Jason-2高度计，已知从完整波形数据中导出$ sigma ^ {0} $对$ psi ^ {2} $的恢复值很敏感，该术语包含误指向和高程足迹内的不均匀性。来自Jason-1 / 2串联任务的六个月数据表明，对于这两个导致非零$ psi ^ {2} $值的原因，需要进行不同的$ sigma ^ {0} $校正。实施这些校正后，Jason-1和Jason-2的$ {rm K} _ {rm u} $波段$ sigma ^ {0} $的均方根值从0.15降至0.05 dB，并且两个显示出明显的风速趋势； Jason-1在大风中大0.04 dB，但在小风中大0.19 dB。在六个月的重叠数据中，偏移量没有明显变化。实施此校正将提高Jason-1 $ sigma ^ {0} $值的一致性，并可能影响轨道拟合程序。

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