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An analysis of rainfall crosspolarisation at microwave frequencies is presented, taking into account differential phase shift through rain as well as differential attenuation. Rain models with distorted drops at either constant or distributed canting angles are considered. The implications of an oscillation-raindrop model are also discussed. Finally, the theory is compared with measurements of crosspolarisation at 11 GHz, showing good agreement, with the implication that raindrops fall with average canting angles of between 0° and 15°.
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Watson et al. (1973) studied this question.
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