A Real-time Error Compensation Method for Atomic Clocks

Abstract

The invention discloses a method for carrying out real-time error compensation on an atomic clock to reduce frequency deviation. Through monitoring an environmental noise variable, an error signal which is affected by the environmental noise variable is compensated and is fed back to a local oscillator in real time to inhibit the effect of the environmental noise, the limitations to atoms and environmental fluctuation control thereof are broken, the frequency uncertainty of the atomic clock is remarkably reduced, and meanwhile, the stability of the atomic clock is improved.

Description

technical field [0001] The invention belongs to a real-time error compensation method, in particular to a method for reducing frequency offset by performing real-time error compensation on an atomic clock. Background technique [0002] Atomic clocks are time-measuring instruments that can be viewed as a combination of a local oscillator and a frequency discrimination physical system. Its working principle is that the microwave signal output by the local oscillator is multiplied and then input to the microwave cavity of the atomic clock to interact with the atoms. The atomic system acts as a frequency discriminator. After the voltage signal, the local oscillator is locked by servo control, and the other frequency signal output by the local oscillator is used as the atomic frequency standard signal, and the accurate time signal is obtained through correction and processing. The fractional frequency offset measured by the frequency discrimination system can be expressed as: y ...

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Problems solved by technology

[0004] The traditional method of reducing the frequency shift of atomic clocks mainly relies on suppressing a certain physical effect to deal with the time-dependent noise, usually through active or passive ways to effectively reduce x i ups and downs, and then according to x i The statistical characteristics of the statistical characteristics to get its contribution to the uncertainty, the statistical characteristics mentioned here are processed according to the standard deviation, in fact, the noise characteristics of various effects present different noise characteristics (such as white noise, random walk, etc.), these effects Finally, it is reflected by the frequency output of the atomic frequency standard. Some effects lead to long-term frequency drift of some atomic frequency standards, which cannot be used as a reference or secondary frequency standard.

[0005] The traditional atomic clock feeds the detected frequency error signal directly to the local oscillator. The method to reduce the frequency shift can only rely on improving the performance of the physical system and more precise control of the atom and its environment, regardless of the performance of the physical system. The improvement of the environment and the control of the environment are limited, and can no longer produce significant effects

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