# Measurement of Rainfall Characteristics and Rain-Attenuation at 38 GHz in Worst Months Affected by El Nino Signal in 1998

• Jang Won-Gyu (Department of Electronics and Computer Engineering, Hanyang University) ;
• Choi Jae-Hoon (Department of Electronics and Computer Engineering, Hanyang University)
• Published : 2005.12.01
• 72 8

#### Abstract

The measurement of unique rainfall phenomenon and rain attenuation on 38 GHz terrestrial links at South Korea in 1998 is presented. It was one of the most severe rainfall years at the measured region due to increased EI Nino signal. The rainfall rate exceeded at $0.01\%$ was 97.4 mm/h during a worst month and annual rate was 63.5 mm/h. Experimentally measured results have been compared with some models and found that the rain attenuation by system level was underestimated by the existing prediction models. As it was measured only three months, further study and measurement of rainfall and rain attenuation in this region are needed for stable millimeter-wave system operation at all times.

#### References

1. H. Xu, T. S. Rappaport, R. J. Boyle, and J. H. Schaffner, '38-GHz wide-band point-to-multipoint measurements under different weather conditions', IEEE Communications Letters, vol. 4, no. 1, pp. 7-8, 2000 https://doi.org/10.1109/4234.823532
2. Y. S. Chang, H. S. An, D. C. Jeon, J. C. Nam, and J. W. Seo, 'EI Nino signals contained in precipitation at east China sea', Climate Research, vol. 23, pp. 31-38, 2002 https://doi.org/10.3354/cr023031
3. ETRI, Study on Regional Distribution of Rainfall Rate According to the Time Rate in Korea, Electronics and Telecommunications Research Institute, 1998
4. ITU-R, 'Propagation data and prediction methods required for the design of terrestrial line-of-sight systems', Rec. pp. 530-10, ITU-R, 2001
5. R. K. Crane, Electromagnetic Wave Propagation Through Rain, John Wiley & Sons, Inc., pp. 145-148, 1996
6. F. Moupfouma, L. Martin, 'Modeling of the rainfall rate cumulative distribution for the design of satellite and terrestrial communication systems', Int. J. Satellite Comm., vol. 13, pp. 105-115, 1995 https://doi.org/10.1002/sat.4600130203
7. KMA, Climatological Standard Normal of Korea 1961-1990 and Annual Climatological Report 1991-2002, Korea Meteorological Administration, Seoul, Korea
8. Y. S. Kim, J. K. Pack, S. S. Lee, S. M. Cho, and H. J. Kim, 'Characteristics of millimeter-wave propagation in rain environments', JKEES, vol. 9, no. 3, pp. 410-417, 1998
9. ITU-R, 'Characteristics of precipitation for propagation modeling', Rec. pp. 837-1, ITU-R, 1997