关键词: 时空转换, 异频相检, 延迟传输, 频率测量

Abstract:

The extra-high frequency measurement is a hot issue of research in the field of current international time-frequency 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 conversion relations, an extra-high frequency measurement in picoseconds was proposed. Utilizing different frequency phase detection principle, a precise short time interval measurement was changed into the measurement of frequency. By introducing conversion relations of the time and space and using stability of signal 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 proposed 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.

Key words: time and space conversion, different frequency phase detection, delay transmission, frequency measurement