New method for performing digital phase-locking processing on passive atomic clock

Abstract

The invention discloses a new method for performing digital phase-locking processing on a passive atomic clock. The new method comprises the steps of performing high-precision digital processing on an excited low-frequency modulation signal and an error feedback signal of a physical portion in the passive atomic clock respectively to realize capturing of the maximum energy level transition probability points (such as the lowest optical detection signal point in the passive rubidium atomic clock) and the zero frequency modulation point of a low-frequency modulation signal, and further to obtain a time difference between the two points; then obtaining a frequency difference of VCOCXO based on a relationship between time and frequency deviation; measuring a time interval tau between the two maximum energy level transition probability points to obtain phase difference change information deltaT; and after accumulated phase difference change is obtained, realizing the high-precision digital phase-locking technology of the passive atomic clock. The new method for performing digital phase-locking processing on the passive atomic clock not only simplifies the internal circuits of the passive atomic clock to a great extent, but also can change the change rule of the frequency stability of the passive atomic clock along with the time in principle, and accordingly can greatly improve the frequency stability and related technical indexes.

Description

technical field [0001] The invention belongs to the technical field of time frequency measurement and control and precision frequency standard, and in particular relates to a method for improving the stability of passive atomic clock frequency standard. Its applications include time-frequency standard devices, precise navigation and positioning, geodetic surveying, communication network synchronization, and a large number of basic science and technology fields. Background technique [0002] High-precision atomic clocks play an important role in various high-tech fields and engineering application fields, and the market is getting bigger and bigger. At present, atomic clocks are developing towards high performance and miniaturization. Passive CPT clocks have been developed in China. Since they do not require microwave cavities and related components, they can be made small and become chip-type atomic clocks. However, there are still some problems in passive atomic clocks at ...

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Problems solved by technology

However, there are still some problems in passive atomic clocks at present. The Q value of the transition signal resonance line of a typical passive atomic clock is significantly higher than that of a crystal device. The combination of them can theoretically obtain better frequency stability and phase noise indicators, but Because the phase relationship in the physical part of the energy level transition mecha

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