Extracting Rainfall Rates from X-band CDR Radar Data by Using Differential Propagation Phase Shift

J. Tan Department of Electronic Systems Engineering, University of Essex, Colchester, United Kingdom

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D. H. O. Bebbington Department of Electronic Systems Engineering, University of Essex, Colchester, United Kingdom

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A. R. Holt Department of Mathematics, University of Essex, Colchester, United Kingdom

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A. Hendry 56 Burnbank Street, Nepean, Ontario, Canada

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Abstract

In this paper, the method of using differential propagation phase shift ΔΦ to measure rain rate R from X-band circular depolarization ratio (CDR) radar data is presented. The principle of this method is based on the fact that there is a relationship between ΔΦ and R. The relationship between ΔΦ and R is investigated under various parameters such as water temperature, raindrop shape, and drop-size distribution form. Differential backscattering phase shift ΔδHV is related to ΔΦ, and this makes it possible to extract ΔΦ from CDR radar data and thus to estimate rain rates. The “cleaning” procedures are utilized to minimize the effects of canting angle. Limitations due to noise and quantization in using ΔΦ to measure R are discussed. Rain-rate measurements obtained by raingage and by radar agree well.

Abstract

In this paper, the method of using differential propagation phase shift ΔΦ to measure rain rate R from X-band circular depolarization ratio (CDR) radar data is presented. The principle of this method is based on the fact that there is a relationship between ΔΦ and R. The relationship between ΔΦ and R is investigated under various parameters such as water temperature, raindrop shape, and drop-size distribution form. Differential backscattering phase shift ΔδHV is related to ΔΦ, and this makes it possible to extract ΔΦ from CDR radar data and thus to estimate rain rates. The “cleaning” procedures are utilized to minimize the effects of canting angle. Limitations due to noise and quantization in using ΔΦ to measure R are discussed. Rain-rate measurements obtained by raingage and by radar agree well.

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