Real-time error compensation method for atomic clock

A technology of error compensation and atomic clock, which is applied in the field of real-time error compensation of atomic clock to reduce frequency offset, which can solve the problems of limited environmental control, no significant effect, and failure to be used as a reference or secondary frequency standard. , to achieve the effect of reducing frequency shift uncertainty and improving frequency stability

Active Publication Date: 2016-06-15
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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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 b

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  • Real-time error compensation method for atomic clock
  • Real-time error compensation method for atomic clock
  • Real-time error compensation method for atomic clock

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[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] We performed experimental verification on the atomic fountain system. The second-order Zeeman effect is selected as the compensation object, and its noise is amplified so that its contribution to the fountain frequency standard uncertainty is much greater than other effects, and its correlation function is detected to test the change of the fountain frequency standard uncertainty before and after noise compensation.

[0028] In the present embodiment, atomic clock (b) adopts fountain atomic clock (h), figure 2 The resistor (j) and the acquisition part of the control card (k) in the figure 1 The first detector (c) in , figure 2 The detector (i) in is equivalent to figure 1 In the second detector (d), the specific steps of implementing the real-time error compensation method are as follows:

[0029] ① Turn on the fountain atomic clock (h), an...

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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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Application Information

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IPC IPC(8): H03L7/26G04F5/14
CPCG04F5/14H03L7/26
Inventor 陈婷婷魏荣董日昌王文丽邹凡王育竹
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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