Method for improving accuracy of standard frequency of rubidium atoms

Abstract

The invention discloses a method for improving the accuracy of the standard frequency of rubidium atoms, which comprises the following steps: (1) alternately outputting a first set frequency value and a second set frequency value as comprehensive modulation signals, and controlling a radio-frequency doubling unit to work by sequence signals; (2) doubling and mixing the output frequency of a voltage controlled crystal oscillator and the comprehensive modulation signals to acquire microwave inquiry signals; (3) acquiring the line width value of a physical system, judging whether the line width value reaches the set value or not, wherein if the line width value reaches the set value, carrying out phase discrimination on quantum frequency discrimination signals to acquire voltage control signals to be transmitted to the voltage controlled crystal oscillator, and if the line width value does not reach the set value, entering step (4); and (4) repeatedly and sequentially outputting the difference value of the first set frequency value and the line width value, the second set frequency value, the sum of the first set frequency value and the line width value and the second set frequency value as comprehensive modulation signals, controlling the radio-frequency doubling unit to work by the sequence signals, and then, returning to step (2). The invention can compress the line width of the physical system to enable coherent microwave inquiry signals to align with the actual standard frequency of the transition spectrum line of rubidium atoms.

Description

technical field [0001] The invention relates to the field of passive rubidium atomic frequency standards, in particular to a method for improving the frequency accuracy of the rubidium atomic frequency standard. Background technique [0002] The atomic frequency standard is a frequency source with excellent stability and accuracy, and has been widely used in the fields of satellite positioning, navigation and communication, instrumentation, and astronomy. The rubidium atomic frequency standard has become the most widely used atomic frequency standard because of its advantages of small size, light weight, low power consumption, and low cost. [0003] The rubidium atomic frequency standard mainly includes voltage-controlled crystal oscillators, physical systems and electronic circuits. The physical system specifically includes a spectral lamp that generates pumping light, an integrated filter resonant bubble that stores rubidium atoms, a microwave cavity that stores microwave...

AI Technical Summary

Problems solved by technology

[0005] However, since the magnetic field actually generated by the C-field coil is not uniform, the transition lines of rubidium atoms cannot be absolutely symmetrical

In this way, the output frequency of the voltage-controlled crystal oscillator through the radio frequency multiplication unit and the frequency of the microwave interrogation signal generated by the integrated modulation signal modulated by the digital frequency synthesizer after microwave multiplication and frequency multiplication by the frequency mixing unit and frequency mixing cannot be Align the standard frequency of the quasi-rubidium atomic transition ordinary line, so that the voltage control signal obtained after the quantum frequency discrimination signal generated by the photovoltaic cell is not accurate after synchronous phase discrimination processing, and the output frequency of the voltage-controlled crystal oscillator locked by the voltage control signal is not standard frequency output

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