作者: D. Morabito , S. Slobin , A. Kantak , C. Ho
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摘要: Two uncertain factors affecting a telecommunication system’s performance are effective antenna gain and system noise temperature. For an Earth-geostationary satellite–Moon system, they attributed to the atmospheric attenuation radiation. In super-high frequency band, attenuations mostly weather related have same values for both upward- downward-propagating signals, while brightness temperatures different effects downwardlooking antennas. this study, six link scenarios analyzed. Analysis of each presented. This study also discusses general methodology determining temperature receiving pointing blackbody given angular extent. A set curves is presented that independent sizes black bodies. Antenna increases calculated as function distance between beam center disk normalized by radius. To show example, these ratios applied case Earth-based looking toward Moon.