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本文主要介绍了我国上空电视卫星的概况，并着重对“亚洲Ⅱ号”卫星Ｋｕ波段在我国具有代表性的４３个城市接收的载噪比（Ｃ／Ｎ）作了计算，并给出了图像等级分别为３分和４．６分时所需要的天线口径。
This paper mainly introduces the general situation of TV satellites over China and focuses on calculating the C / N ratio of the received satellite Ku-band of “Asia II” satellite in 43 cities in our country, and gives the images Levels were 3 and 4.6 points when the required antenna diameter.