Based on the existing theories on scattering from a volume of rain and empirical models on rain drop size distribution and Mie solution of the problem of diffraction by a sphere, it is shown that for radar frequencies below 10 GHz one can realize 10 dB rain rejection by using circular polarization as opposed to linear polarization for bistatic angles of up to90.
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V.P. Pyati (1984) studied this question.
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