Summary
International Symposium on Antennas and Propagation
2012
Session Number:4D3
Session:
Number:4D3-4
Rain Attenuation Characteristics of Ku-band Satellite Signals in relation to the Wind Velocities Observed on the Ground
Yutaka Inamori, Yoshiaki Shibagaki, Yasuyuki Maekawa,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
In this study, Ku-band satellite signal levels have been simultaneously observed at Osaka Electro-Communication University (OECU, Neyagawa, Osaka), the Research Institute for Sustainable Humanosphere (Uji, Kyoto) and the Shigaraki MU radar observatory (Koga, Shiga) of Kyoto University since September 2002 [2]. The direction and speed of rain area motions are estimated from the time differences in the attenuation detected at these three locations, and compared with the wind direction and speed measured by the AMeDAS located at a nearby station (Hirakata, Osaka) on the ground, which is 6.7 km north-east from OECU, during the year of 2010. Although the simultaneous observations have only eight examples in this year, considerable correlations of 0.5-0.6 are found between the rain area motions and the ground wind velocities. Also, there is a tendency that the speeds of the rain area motions in the upper area are several times larger than the wind speeds measured by AMeDAS on the ground, while the directions of the rain area motions are slightly turned to eastward compared to the ground wind directions. Thus, the rain area motions in the upper air may be, to some extent, estimated from ground wind velocities which can be easily obtained from usual routine meteorological measurements, such as AMeDAS. It is also suggested that the direction and speed of the rain areas which is important to site diversity techniques may be easily estimated from the ground wind velocity measurements.