Summary
International Symposium on Antennas and Propagation
2012
Session Number:4D2
Session:
Number:4D2-2
Effects of Integration Time on Rainfall Intensity and Rain Attenuation Cumulative Distributions
Shuhei Kaneko, Hajime Fukuchi,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
Although we use satellite communication, due to increasing demands of satellite communication and the number of satellites, frequency spectrums will be almost fully used. So, we need to use higher frequency bands, such as Ku-band. In these bands, rain attenuation degrades the link performance. We need to take countermeasure for this problem. For this purpose, we must know rainfall rate and rain attenuation statistics. We measured rainfall rate every 1 second in Japan and got the information on rainfall rate time series with 1 second measurement. Then we calculated rainfall intensity and the dependence on integration time of cumulative distribution. And, we got the integration time effect on attenuation statistics based on measured attenuation data at 19.5 GHz in Japan with an elevation angle of 48 degrees. We analysed integration time dependence of attenuation cumulative distribution and we noticed that cumulative percentages decrease when the integration time is changed from 1 second to other integration times. Furthermore, we got rain attenuation statistics at 12 GHz in Thailand. From this, we got cumulative distributions of attenuations with several integration intervals at Ku-band in Bangkok. We found that no significant difference between 1and 60 seconds results as far as cumulative percentage larger than 0.1 % is considered. In other words, if one wants to design satellite link budget with availability less than 99.9 %, cumulative distribution of attenuation derived from 1 minute integration time can be used even in tropical Asian area.