Study of Prediction Models Compared with the Measurement Results of Rainfall Rate and Ku-band Rain Attenuation at Indonesian Tropical Cities

In this paper, we present our contribution of rainfall rate and Ku-band rain attenuation measurements at Bandung. This measured data is an important complement to several of previous recorded data from other tropical cities in Indonesia for characterizing the Ku-band satellite propagation in tropical area. The two years of our experiment results indicate that the measured R_0.01 rainfall rate at Bandung is 120 mm/h and the measured A_0.01 rain attenuation is 17 dB. Therefore, the P region of ITU-R model is over estimated for Bandung, and we suggest that Q-region of ITU-R model is more suitable for Bandung. Another previous measurements which had performed in Indonesia confirmed with our conclusions that some cities in Indonesia have not only P-region of ITU-R model (such as Padang, Bengkulu an Makassar), but also N (Jayapura) and Q-region (Surabaya). Based on 10 samples rainfall rate in Indonesian archipelago, we have developed new prediction model of R_0.01 value for Indonesian cities. Concerning to the rain attenuation statistics, we have found out, that the DAH model is valid for Indonesia. We also have found out that if Bandung is modelled by Q-region of ITU-R, we should include the wetting antenna effects as the correction factor to the the ITU-R model for confirming with the measured A_0.01 rain attenuation