2017/05/15 by Yicheng Guo, Bo Wang, Guo, Y. C. +17
Engineering · Physics and Astronomy · #Advanced Frequency and Time Standards #Atomic and Subatomic Physics Research #FOS: Physical sciences #Geophysics and Sensor Technology #Instrumentation and Detectors (physics.ins-det)
paper · pdf · doi:10.48550/arxiv.1705.06580
openalex publication_date 2017/05/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The correlation of co-located hydrogen masers (H-masers) is difficult to measure because their common-mode noise induced by the environment will be cancelled out during the comparison measurement. With the development of fibre-based high-precision time and frequency transfer technique, the correlation of co-located hydrogen masers can be directly measured with the help of remote H-masers. Recently, a fiber-based frequency synchronization network was constructed in the Beijing region by connecting 5 H-masers from 4 institutions. The correlation coefficient of atomic clocks is defined and the correlation between two co-located H-masers is measured using both experimental and simulative methods. The results show that the correlation is not prominent until the averaging time is larger than ∼103s; then, the coefficient grows rapidly for averaging times ranging from ∼103s to ∼105s and decreases beyond ∼105s up to 5 days.