描述和分析群时延的含义和测量方法，着重研究了变频链路绝对群时延的测量方法，对三混频器和矢艟混频器技术进行了详细分析和论述。矢量混频器技术已在工程中应用，测试结果表明，矢量混频器技术较好地解决了变换链路绝对群时延的测量。

The definition and measurement techniques for group delay has been described and analyzed in this paper, the new techniques, being called three-mixer technique and vector-mixer calibration for measuring the absolute group delay of the frequency converters has been researched and analyzed in detail also in this paper. By now the vector-mixer calibration technique has been used in our project, the test results show that vector-mixer calibration sloved measuring absolute group delay of frequency converters successfully.

TN919