幅值校正误差对SMOS全局图像的影响

Israel Durare, I. Corbella, F. Torres, N. Duffo, R. Oliva, M. Martín-Neira
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引用次数: 0

摘要

在SMOS亮度温度图像中观察到的一些伪影源于相关误差与天线温度校准误差之间的不一致,这产生了与场景平均天线温度成比例的乘法偏差。它最重要的影响,虽然不是唯一的影响,是沿海地区附近的陆地对海洋的污染,这种污染不能轻易地通过后处理校正技术加以减轻。简化的端到端模拟器允许在天线温度和相关性中引入单独的误差,从而提供了对该问题的重要见解,并有助于了解其起源。模拟结果与实测数据的实际结果比较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of amplitude calibration errors on SMOS global images
Some of the artifacts observed in SMOS brightness temperature images are originated in an inconsistency between correlation and antenna temperature calibration errors, which produces a multiplicative bias that scales with the scene mean antenna temperature. Its most important effect, although not the only one, is a land-to-sea contamination near coastal areas, which cannot be easily mitigated by post-processing correction techniques. A simplified end-to-end simulator allows introducing separate errors in both antenna temperature and correlation, thus providing an important insight on this problem and helping understanding its origin. Results from simulations compare very well with actual results from measured data.
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