Spaceborne Doppler Radar Measurements of Rainfall: Correction of Errors Induced by Pointing Uncertainties
Spaceborne Doppler Radar Measurements of Rainfall: Correction of Errors Induced by Pointing Uncertainties
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星载多普勒雷达降雨测量：修正指向不确定性引起的误差
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
L. Facheris
中科院分区：
文献类型：
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作者：
S. Tanelli;E. Im;Satoru Kobayashi;R. Mascelloni;L. Facheris
摘要 本文提出了一种海面雷达回波谱分析技术，用于校正雷达指向不确定性引起的降雨速度误差。当雷达观测均匀的降雨场时，校正过程非常简单。然而，当发生非均匀波束填充 (NUBF) 并使用衰减频率时，需要额外的步骤才能正确估计天线指向方向。这项新技术依赖于频率-时间组合（CFT）算法的应用来校正观测到的海面多普勒频谱的不均匀衰减效应。该校正技术的性能通过对来自高分辨率 3D 雨场（由云解析数值模型生成或从机载雷达测量中检索）的多普勒降水雷达反向散射进行蒙特卡罗模拟来评估。结果表明，所提出的技术确实可以减少天线指向引起的误差...
Abstract In this paper a sea surface radar echo spectral analysis technique to correct for the rainfall velocity error caused by radar-pointing uncertainty is presented. The correction procedure is quite straightforward when the radar is observing a homogeneous rainfall field. When nonuniform beam filling (NUBF) occurs and attenuating frequencies are used, however, additional steps are necessary in order to correctly estimate the antenna-pointing direction. This new technique relies on the application of the combined frequency–time (CFT) algorithm to correct for uneven attenuation effects on the observed sea surface Doppler spectrum. The performance of this correction technique was evaluated by a Monte Carlo simulation of the Doppler precipitation radar backscatter from high-resolution 3D rain fields (either generated by a cloud resolving numerical model or retrieved from airborne radar measurements). The results show that the antenna-pointing-induced error can, indeed, be reduced by the proposed techniqu...