优于皮秒分辨率的特高频率测量方法

Extra-High Frequency Measurement for Picoseconds Resolution

特高频率的测量是当前国际时频测控领域的研究热点.针对特高频率测量难、精度不易保证等问题,结合时空转换关系,提出了一种优于皮秒分辨率的特高频率测量方法.利用异频相位检测原理,把频率的测量转换为精密短时间间隔的测量,在短时间间隔测量中引入时间和空间的转换关系,利用信号传输延迟的稳定性,通过测量空间长度量获得延迟时间相位差,最终实现特高频率的测量.实验结果证明了该方法的有效性和可行性,在射频范围内其测量分辨率可达到10-12/s量级,与传统的频率测量方法相比,具有结构简单、成本低廉及测量精度高的特点.

The extra-high frequency measurement is a hot issue of research in the field of current interna- tional time-fi＇equency measurement and control. Aiming at difficult measurement and uncertain precision of extra-high frequency in time and frequency measurement domain and combining time and space conver- sion relations, an extra-high frequency measurement in picoseconds was proposed. Utilizing different fre- quency phase detection principle, a precise short time interval measurement was changed into the meas- urement of frequency. By introducing conversion relations of the time and space and using stability of sig- nal delay in the course of transmission, a phase difference of delay time was obtained based on measuring space length value. Furthermore, an extra-high frequency measurement could be achieved in the pro- posed method. Experiment shows that the measurement resolution of 10-12 within 1 s can be reached in radio frequency range. Comparing the traditional frequency measurement method, the proposed method features simple structure, low cost and high measurement precision.