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http://hdl.handle.net/2014/40839
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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
precipitation
sea surface
remote sensing
radar |
| Issue Date: | Mar-2005 |
| Publisher: | American Meteorological Society |
| Citation: | Journal of Atmospheric and Oceanic Technology, Vol. 22, Iss. 11, doi.org/10.1175/JTECH1797.1 |
| 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. |
| URI: | http://hdl.handle.net/2014/40839 |
| Appears in Collections: | JPL TRS 1992+
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