Three kinds of satellite broadcasting receiving antenna systems, namely a center-fied parabolic reflector antenna, offset parabolic reflector antermas and planar antennas, have been measured at Hokkaido University for a long term to evaluate their G/T degradation due to weather conditions. The measurement is continually carried out with high accuracy using the satellite broadcasting signal. In this paper, an overview of the measurement system and a newly developed noise estimation method are described. From the measurement results, it is shown that an offset parabolic reflector antenna with a smaller aperture tends to be less affected by weather conditions.
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