基于双频信号相位重合点的秒信号产生法  

Method for obtaining a second signal based on the phase coincidence sign between two frequency signals

作　　者：屈八一[1] 周渭[1] 秦红波[1] 李智奇[1] 

机构地区：[1]西安电子科技大学机电工程学院,陕西西安710071

出　　处：《西安电子科技大学学报》2008年第5期899-902,931,共5页Journal of Xidian University

基　　金：国家自然科学基金资助(60571060;10703004)

摘　　要：利用两个有一定频差的频率信号相位差变化的周期性规律提出了一种秒信号产生方法.两频率信号可以来自同一个源,但有一个特定的频差.利用选通闸门配合重合检测电路完成相位重合点的高精度提取,并通过对两路信号适当移相使得提取到的相位重合点与标准时间同步.实验结果表明,该方法与传统方法产生的秒信号准确度及稳定度相当,但是将它用于授时系统时,可以发挥频率信号易于传递和测量的优点;用于原子钟比对时,能利用频率源的比相完成时间比对,降低了成本却提高了比对精度.The method for generating the second signal is put forward based on the period rule of the phase difference for two frequency signals with the frequency difference. The two frequency signals with a certain frequency difference can be obtained from the same source. The phase coincidence detection circuit outputs an exclusive coincidence signal with the help of a time gate, and then the phases of the two frequency signals would be moved properly to make the coincidence signal synchronize to a normal second signal. Experiment shows that the method is same as the conventional one in generating a second signal, but facilitates the advantage of delivery and measurement of frequency signal when it is used in the time promulgation system. When used in the atomic clocks time comparison, the comparison can be fulfilled using the phase comparison of the frequency sources, so as to improve the accuracy as well as reduce the cost.

关 键 词：双频信号 相位重合 秒信号 

分 类 号：TB939[一般工业技术—计量学]