Variability of millimetrewave rain attenuation and rain rate prediction: A survey

325-344This paper reviews the literature on attenuation of mm-wave due to rain and rain rate prediction methods to analyze the performance of the various systems proposed by different workers at different parts of the globe under varying meteorological and topographical conditions with an emphasis on the observational reports made in the tropics, particularly in the Indian subcontinent. In this comprehensive review, besides considering the various features related to rain rate, the various methods proposed for prediction of rain attenuation have been examined and thereby a comparison of those prediction methods is made. Finally, scopes for future investigation have been critically focused