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代码说明：

  卫星地球站传输链路计算，卫星通信中，卫星损耗的计算十分重要，用于判断通信质量，以及卫星载荷的饱和程度(Satellite earth station transmission link, satellite communication, satellite loss calculation is very important for judging the quality of communication, as well as satellite payload saturation level)