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Multi-reference clock switching device and method based on beat digitization frequency measurement

A frequency measurement, multi-reference technology, applied in multiplexing communications, time division multiplexing systems, electrical components, etc. The effect of reducing complexity

Active Publication Date: 2021-10-26
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Affected by the measurement resolution of the time interval counter and the control strategy of the backup signal, there is a sub-nanosecond time difference between the main and backup signals, and switching will result in a sub-nanosecond phase jump;

Method used

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  • Multi-reference clock switching device and method based on beat digitization frequency measurement
  • Multi-reference clock switching device and method based on beat digitization frequency measurement
  • Multi-reference clock switching device and method based on beat digitization frequency measurement

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Embodiment 1

[0068] Such as figure 2 As shown, the present invention provides a multi-reference clock switching device based on beat digitized frequency measurement, said device comprising: n+1 mixers, analog-to-digital converters, computers, digital-to-analog converters, voltage-controlled crystal oscillators and A digital frequency signal synthesizer; the first input terminals of the first n mixers are respectively connected to n atomic clocks, and the first input terminal of the n+1th mixer is connected to the signal output terminal of the voltage-controlled crystal oscillator ; The second input terminals of the n+1 mixers are respectively connected to the output terminals of the digital frequency signal synthesizer, and the output terminals of the n+1 mixers are respectively connected to the analog-to-digital converters The input end is connected, the output end of the analog-to-digital converter is connected to the input end of the computer, the output end of the computer is connecte...

Embodiment 2

[0071] Such as image 3 As shown, the present invention also provides a multi-reference clock switching method based on beat digitized frequency measurement, said method comprising the following steps:

[0072] In step 301, the frequency signals output by n atomic clocks are mixed with the reference signal output by the digital frequency signal synthesizer, and the digital beat signals of the first n channels are converted by an analog-to-digital converter and output as n input signals.

[0073] The frequency signals output by no less than two atomic clocks with the same level of frequency stability in seconds are mixed with the signals output by a digital frequency synthesizer through a multiplier, and the mixed output signals are filtered by a low-pass filter In addition to high-frequency components, the output frequency is 1 ~ 1kHz beat frequency signal. The reference signal of the digital frequency synthesizer comes from the frequency signal finally output by the voltage-...

Embodiment 3

[0111] The present invention also provides a multi-reference clock switching system based on beat digitized frequency measurement, said system comprising:

[0112] The input signal acquisition module is used to obtain the frequency signals output by n atomic clocks and the reference signal output by the digital frequency signal synthesizer to mix, and the digital beat signals of the first n channels output after conversion by the analog-to-digital converter, as n an input signal.

[0113] The feedback signal acquisition module is used to obtain the output signal of the voltage-controlled crystal oscillator and the reference signal output by the digital frequency signal synthesizer to mix, and the digital beat signal of the n+1th channel output after being converted by the analog-to-digital converter, as Feedback signal.

[0114] The main reference signal determination module is configured to determine the most stable input signal among the n input signals as the main referenc...

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Abstract

The invention relates to a multi-reference clock switching device based on beat digitization frequency measurement. The device comprises n+1 frequency mixers, an analog-to-digital converter, a computer, a digital-to-analog converter, a voltage-controlled crystal oscillator and a digital frequency signal synthesizer. According to the invention, the digital beat signal of each atomic clock channel is obtained directly based on the beat digitization frequency measurement technology; the most stable digital beat signal is selected as a main reference signal based on the computer; the voltage-controlled crystal oscillator is directly adjusted through the difference value of the main reference signal and a feedback signal, and no change-over switch is needed; and thus, the technical defect of output interruption caused by switching time delay of a pulse or frequency conversion switch is overcome, the structure of the switching device is simplified, and the complexity of an existing master clock switching system is reduced. Moreover, the output of the voltage-controlled crystal oscillator is only related to the most stable signal in input equipment and is not influenced by other signals, so the frequency stability of the output signal is improved.

Description

technical field [0001] The invention relates to the technical field of communication clock switching, in particular to a multi-reference clock switching device and method based on beat digitized frequency measurement. Background technique [0002] Such as figure 1 As shown, the main working principle of the existing main clock switching method is to establish two sets of equipment with the same structure as the main and backup, which are composed of at least two atomic clocks, phase trimmers, time interval counters, pulse conversion switches and frequency conversion switches. The main and standby signals are respectively connected to the time interval counter device and the transfer switch after passing through the phase trimmer, and the output of the transfer switch is the final use signal. The time interval counter is used to monitor the time difference between the main and backup signals in real time, and the time difference value is fed back to the phase trimmer corresp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
CPCH04J3/0638H04J3/0682
Inventor 刘娅肖波赵志雄李孝辉薛艳荣朱峰
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI