【摘要】 文章对统一S波段应答机下行测距调制度随上行信噪比以及工作模式的不同而不同的现象进行了分析,推导出计算公式,并和实测数据进行了比对。实测数据与文中的理论分析的结果是一致的。另外,文章也说明了测距下行调制度变化的具体计算公式将随不同应答机模型不同而不同。在设计计算时,应当对具体的应答机转发模型进行分析,而不能简单引用CCSDS标准所给出的公式。更多还原

【Abstract】 The downlink ranging modulation index was variable while the signal to noise ratio (S/N) changes in the uplink channel or the telecommand and ranging operates simultaneously or respectively,which was due to the multi-subcarrier modulation and the structure of the transponder.The expressions were formulated and the computed data and test results were compared.And the test data is in accord with the principle analysis result.In addition,the expressions are different due to the different structure model of transponders.The expressions deduct by the paper,for example,are different form that recommended by CCSDS standards.更多还原