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Title: Spaceborne doppler radar measurements of rainfall : correction of errors induced by pointing uncertainties
Authors: Tanelli, Simone
Im, Eastwood
Kobayashi, Satoru
Mascelloni, Roberto
Facheris, Luca
Keywords: velocity
sea surface
remote sensing
Issue Date: Mar-2005
Publisher: American Meteorological Society
Citation: Journal of Atmospheric and Oceanic Technology, Vol. 22, Iss. 11,
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 technique in order to achieve 1 m s(-1) accuracy on rainfall vertical velocity estimates.
Appears in Collections:JPL TRS 1992+

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