Abstract
The theories describing the effects of the troposphere on satellite communication systems operating in the microwave region are reviewed. The results of computations based upon the theories and atmospheric models are presented and compared with available experimental data. From the model computations it is seen that rain causes the major propagation problems for the frequency bands allocated to or proposed for allocation to the satellite communications service. Two effects are dominant: attenuation due to rainfall along the line-of-sight and interference between two systems operating at the same frequency and beyond each other's radio horizon due to rain scatter. The methods for calculating the magnitude of the effects of rain given the spatial distribution of rainfall intensity are available. The statistical data required for the prediction of the spatial distribution of rainfall intensity are not available.
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