Rain Measurement for Improved Propagation Modelling in Czech Republic

When planning the microwave links (i.e. reasonable transmitter power, antenna diameters, receiver noise number etc.) it is necessary to take into account the atmospheric attenuation, especially its major component that is caused by rain. According to the international conventions, the considerations are based on the cumulative distribution of the atmospheric attenuation. This contribution shows some examples of rain data analysis aiming at the radiowave propagation assessment and fade mitigation technique. The cumulative rain rate distribution, the distribution of fade and interfade duration is presented. Statistical dynamic properties of rain event are added. A method attempting the estimation of the basic rain type is shown and an equation to predict the type and the decision threshold is described. A simple method to estimate the site diversity gain based on rain rate measurement is also included.