基于组合方式的延时精确测量方法

研究了延时线的精确时间测量方法。首先介绍了传统群时延测量方法的误差，并分析了误差形成的机理，然后提出采用基于群时延和相位时延相结合的方式进行延时精确测量的方法。采用二次测量的方式，结合群时延的粗测量和相位时延的精测量，完成延时的精确测量，并通过仿真、试验验证了该方法在延时测量方面的精度更高。

Time delay accurate measurement base on the combination mode

This paper investigates the precise measurement of the time-delay lines. Firstly, the error of traditional group delay measurement is introduced and the mechanism of error formation is analyzed, and then propose the time delay accurate measurement based on the combination of group delay and phase delay. The method adopts the secondary measurement, combined with the coarse measurement of group delay and the accurate measurement of phase delay, to complete the accurate measurement of time delay. We verify that the proposed method has higher measurement accuracy in delay measurement through simulation and experiment.