小口径アンテナによる衛星放送受信C/N特性 : 情報ディスプレイ : 無線・光伝送 : 画像通信システム : 画像応用

概要

論文の詳細を見る
At the time of rainfall, the increase of antenna noise temperature accompanying raindrop scattering appears in the receivers using low noise converters. The decrease of CN ratio was observed frequently at the time of rainfall. The standard deviation value of the signal level also became large by 0.2-0.5 dB at the time of rainfall. According to the kinds of antennas, there were some, with which CN ratio largely decrease rainy season. Plane type antennas were affected by rainfall, and the deterioration of both CN ratio and standard deviation value was large as compared with offset-parabola antennas. Moreover, when there was night dew, the lowering of CN ratio by 2-3 dB was observed in plane type antennas. Offset-parabola antennas were hardly affected by rainfall.
社団法人映像情報メディア学会の論文
1993-01-29