This analysis demonstrates reduced phase drift and improved stability in frequency synchronization with X-band systems, indicating robustness against vibrations.
High-precision and long-term stable frequency synchronization of microwave signal is highly demanded in distributed system. This work presents a high-precision frequency synchronization system based on X-band passive phase-stabilized transmission. Firstly, the 100-MHz signal at the local site is frequency-multiplied to 10 GHz, which is then transferred to the remote site through an X-band passive phase-stabilized system. In the remote site, the 10 GHz signal is divided into 100 MHz, which shows a fractional frequency instability reaching 2.1×10⁻¹³ @ 1000 s. Then feedback compensation for the phase difference is carried out through a PC-controlled phase micro-leap meter, which eliminates the phase drift between the local and remote ends. As a result, the phase drift is within 5° over 1 hour. Besides, the impacts of vibrations on the stability of synchronization are analyzed. In 15 minutes, the phase shift of two free-running clocks is enlarged from 8.0 degrees to 44.9 degrees due to the vibration. As a comparison, the phase shift using the passive phase-stabilization over fiber only enlarged from 1.7 degrees to 2.5 degrees.
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Li et al. (2025) studied this question.
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