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Signal to noise ratio evaluation device and method for rubidium atomic frequency standard

A technology of rubidium atomic frequency standard and signal-to-noise ratio, which is applied in the field of signal-to-noise ratio evaluation device of rubidium atomic frequency standard, can solve the problems of complicated measurement process, inaccurate signal-to-noise ratio of rubidium atomic frequency standard, difficulty in installing other equipment, etc. Streamline the evaluation process, improve accuracy, and save resources

Active Publication Date: 2012-12-05
JIANGHAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The signal-to-noise ratio of the rubidium atomic frequency standard is measured by an external frequency sweeper, recorder and data processing device. On the one hand, the above-mentioned instruments need to be installed when measuring the signal-to-noise ratio, which makes the measurement process too complicated; at the same time, the existing rubidium atomic frequency standard Various functional modules are often integrated together, it is difficult to install additional equipment, and the circuit needs to be redesigned; on the other hand, the existing technology only calculates the signal-to-noise ratio based on the quantum correction voltage, and the required parameters in the signal-to-noise ratio formula The absorption factor is an estimated value, which leads to the inaccurate signal-to-noise ratio of the calculated rubidium atomic frequency standard

Method used

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  • Signal to noise ratio evaluation device and method for rubidium atomic frequency standard
  • Signal to noise ratio evaluation device and method for rubidium atomic frequency standard
  • Signal to noise ratio evaluation device and method for rubidium atomic frequency standard

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Embodiment 1

[0047] see figure 2 , Embodiment 1 of the present invention provides a signal-to-noise ratio evaluation device for a rubidium atomic frequency standard, and the device specifically includes: a first analog-to-digital sampling unit 101 , a second analog-to-digital sampling unit 102 and a main control unit 103 .

[0048] Wherein, the first analog-to-digital sampling unit 101 is used to collect the frequency discrimination signal output by the physical system 5 under the action of the unmodulated microwave inquiry signal.

[0049] Wherein, the second analog-to-digital sampling unit 102 is used to collect the voltage control signal of the frequency discrimination signal output by the physical system 5 under the action of the modulated microwave interrogation signal, which is phase-locked by the servo loop 3 .

[0050] Wherein, the main control unit 103 is used to output the first frequency sweep voltage and the second frequency sweep voltage to the voltage-controlled crystal osci...

Embodiment 2

[0054] see image 3 Embodiment 2 of the present invention provides a signal-to-noise ratio evaluation device for a rubidium atomic frequency standard, which includes a first analog-to-digital sampling unit 201 , a second analog-to-digital sampling unit 202 and a main control unit 203 .

[0055] Wherein, the first analog-to-digital sampling unit 201 is respectively connected with the physical system 5 and the main control unit 203, and is used for collecting the frequency discrimination signal output by the physical system 5 under the action of the unmodulated microwave inquiry signal. The unmodulated microwave interrogation signal is generated by the output signal of the voltage-controlled crystal oscillator 1 and the single-frequency signal output by the synthesizer 2 after being processed by the microwave multiplying and mixing circuit 4 .

[0056] Wherein, the second analog-to-digital sampling unit 202 is respectively connected with the servo loop 3 and the main control uni...

Embodiment 3

[0072] see Figure 7 , Embodiment 3 of the present invention provides a method for evaluating the signal-to-noise ratio of a rubidium atomic frequency standard, the method specifically includes:

[0073] 301: Output the first frequency sweep voltage to the voltage-controlled crystal oscillator, so that the voltage-controlled crystal oscillator outputs a frequency-changing signal; and collect a frequency discrimination signal output by the physical system under the action of the unmodulated microwave inquiry signal.

[0074] Wherein, the unmodulated microwave interrogation signal is generated by the output signal of the voltage-controlled crystal oscillator and the single-frequency signal output by the synthesizer after being processed by a microwave multiplier and mixing circuit.

[0075] Wherein, the first frequency sweep voltage and the frequency discrimination signal form a one-to-one correspondence.

[0076] 302: Output the second sweep voltage to the voltage-controlled cry...

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Abstract

The invention discloses a signal to noise ratio evaluation device and a signal to noise ratio evaluation method for a rubidium atomic frequency standard, and belongs to the field of atomic frequency standards. The device comprises a first analogue-to-digital sampling unit, a second analogue-to-digital sampling unit and a master control unit. The method comprises the following steps of: drawing an absorption curve according to a corresponding relationship between a frequency discrimination signal and a voltage point of first sweep voltage; drawing a frequency discrimination curve according to a corresponding relationship between a voltage control signal and a voltage point of second sweep voltage; calculating an absorption factor according to the absorption curve; calculating a line width according to the frequency discrimination curve; acquiring a preset modulation depth; and calculating the signal to noise ratio of the rubidium atomic frequency standard by using the absorption factor, the line width and the modulation depth. By the device and the method, the accuracy of the signal to noise ratio of the rubidium atomic frequency standard is improved.

Description

technical field [0001] The invention relates to the field of atomic frequency standards, in particular to a signal-to-noise ratio evaluation device and method for rubidium atomic frequency standards. Background technique [0002] With the continuous development of science and technology, people have more and more demands on standard clock sources. Due to the advantages of simple structure, small volume and power consumption, and low cost, rubidium atomic frequency standards have been widely used in the field of clock sources. [0003] Among them, the signal-to-noise ratio of the rubidium atomic frequency standard is an important performance index of the rubidium atomic frequency standard, which determines the stability of the output frequency of the rubidium atomic frequency standard. In order to improve the stability of the output frequency of the rubidium atomic frequency standard, it is necessary to evaluate the signal-to-noise ratio of the rubidium atomic frequency stan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/26
Inventor 雷海东
Owner JIANGHAN UNIVERSITY
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