摘要：

A numerical solution of the radiative transport equation is given for a plane-parallel rain medium in connection with the estimation of the incoherent effect on attenuation and cross-polarization of a millimeter wave due to rain. The method of solution consists of an extension of the spherical harmonics method. An assembly of spherical raindrops is considered. From the analysis, it is found that the exact expression of Mie scattering can be incorporated into the integral term of the transport equation, thus allowing the integral to be evaluated without approximation. Preliminary calculations are performed at 34.8 and 82 GHz. Circular polarizations are considered. The results include the directional patterns of reflected and transmitted incoherent intensity, both for left-hand and right-hand circular polarizations, the effect of drop size on the directional patterns, the incoherent signal intensities within the rain medium, and so on.

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