Spaceborne radar measurements of rainfall vertical velocity

Eastwood Im; Simone Tanelli; Dino Giuli; Stephen L. Durden; Luca Facheris

doi:10.1117/12.410598

21 December 2000 Spaceborne radar measurements of rainfall vertical velocity

Eastwood Im, Simone Tanelli, Dino Giuli, Stephen L. Durden, Luca Facheris

Proceedings Volume 4152, Microwave Remote Sensing of the Atmosphere and Environment II; (2000) https://doi.org/10.1117/12.410598
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

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.

Citation Download Citation

Eastwood Im, Simone Tanelli, Dino Giuli, Stephen L. Durden, and Luca Facheris "Spaceborne radar measurements of rainfall vertical velocity", Proc. SPIE 4152, Microwave Remote Sensing of the Atmosphere and Environment II, (21 December 2000); https://doi.org/10.1117/12.410598

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