Development of a climatic map of attenuation by rainfall for Turkey

A climatic map of rainfall attenuation for Turkey is developed. For this purpose, meteorological data with a 24 hour integration time for 214 sites throughout Turkey is gathered and processed to obtain a 1-5 minute database. In the second stage, the attenuation is predicted by the Leitao-Watson (1986) model. In the final stage the regional and global attenuation maps are prepared by a contouring procedure, depending on exceedence probabilities, frequency, polarisation and satellite position. Rainfall intensity and attenuation maps for all possible Earth-space links at frequencies between 10-30 GHz are produced, and the predicted results are compared with the measured values to evaluate the accuracy of the model.