21 December 2000 Spaceborne radar measurements of rainfall vertical velocity
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Abstract
This paper studies the performance of a spaceborne precipitation radar in measuring vertical Doppler velocity of rainfall. As far as a downward pointing precipitation radar is concerned, one of the major problems affecting Doppler measurement at the nadir direction arises from the Non-Uniform Beam-Filling effect (NUBF). That is, when significant variation in rain rate is present within the radar IFOV in the along track direction. The Doppler shift caused by the radial component of the horizontal speed of the satellite is weighted differently among the portions of IFOV. The effects of this non-uniform weighting may dominate any other contribution. Under this condition, shape, average value and width of the Doppler spectrum may not be directly correlated with the vertical velocity of the precipitating particles. However, by using an inversion technique which over-samples the radar measurements in the along track direction, we show that the shift due to NUBF can be evaluated, and that the NUBF induced errors on average fall speed can be reduced.
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Eastwood Im, Eastwood Im, Simone Tanelli, Simone Tanelli, Dino Giuli, Dino Giuli, Stephen L. Durden, Stephen L. Durden, Luca Facheris, Luca Facheris, "Spaceborne radar measurements of rainfall vertical velocity", Proc. SPIE 4152, Microwave Remote Sensing of the Atmosphere and Environment II, (21 December 2000); doi: 10.1117/12.410598; https://doi.org/10.1117/12.410598
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