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In the WG for the study of technical requirement for UWB in the UWB Radio System Committee of MIC, the interference of 24GHz UWB radars toward the Earth Exploiting Satellite Service (EESS) has been studied. This study is based on the ITU recommendations and includes Japan inherent conditions. They are car density, building density and building height. As an area under study, the area (306[m]) with highest population densities in Tokyo metropolitan is chosen. It is assumed that the satellite and radiometer are GCOM-W1and AMSR2, respectively. Results tell: the worst case, excluding the building reflection loss and having high activity factor, has the margin of 1.2 [dB] for the diffusion rate of the vehicles with UWB radar = 0.1% and the apportion = 1%, and another case including the reflection loss and low activity factor has that of 6.4[dB].

Study on the Interference of a 24GHz UWB Radar toward EESS