Time base frequency real time calibration frequency measuring method and apparatus

A time base frequency, frequency measurement technology, applied in the field of electronics and instruments, to achieve the effect of accurate frequency

Inactive Publication Date: 2009-05-27
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention can solve various problems that require highly accurate time base frequency, especially in field conditions to ensure high accuracy and realize high-precision frequency measurement; in principle, the time base frequency of the frequency meter does not need to be regularly sent to the metrology department for calibration

Method used

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  • Time base frequency real time calibration frequency measuring method and apparatus
  • Time base frequency real time calibration frequency measuring method and apparatus
  • Time base frequency real time calibration frequency measuring method and apparatus

Examples

Experimental program
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Embodiment 1

[0042] refer to Figure 1 to Figure 4 , prepare standard frequency receiver 1, high-resolution frequency counter 2, high stability (time base) crystal oscillator 3, measurement and control unit 4, measurement and control software 5, input signal channel selector 6, external frequency Standard 7 and Power 8.

[0043]Frequency standard 7 outside the machine is a necessary component part that the present invention realizes high-accuracy frequency measurement, and it comprises: the standard frequency signal that earth positioning systems such as GPS, GLONASS, Beidou, Galileo transmits, each country utilizes the selected color TV channel The standard frequency signal broadcast by sub-carriers, and the special long-wave and short-wave standard frequency signals issued by dedicated radio stations can be received by the corresponding standard frequency receiving module in a wireless manner by standard frequency receiver 1. Under good conditions, the received above-mentioned The frequ...

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Abstract

The invention discloses a real-time calibration and frequency measurement method for time base frequency and a device thereof, wherein the method comprises the following steps: 1) calibration step: a frequency measurement device acquires an external high-accuracy standard-frequency signal with Fs of given frequency as a calibration signal; the actual frequency value measured by the frequency measurement device is Fs'; a calibration factor K which is equal to Fs/Fs' is calculated and stored, and the calibration factor K can not be updated until the next calibration step is finished; 2) measurement step: the frequency of the unknown signal measured by the frequency measurement device is Fx', and the calculated and revised frequency value of the unknown signal Fx is equal to K * Fx'; 3) the process returns to step 1). The method and the device can ensure that, the time base frequency can be as accurate as 5E-10 and the second gate time frequency measurement can be as accurate as 1E-9 when measuring frequency and the accuracy of the measured frequency can be determined, thereby solving the problems of undetermined frequency timing base frequency accuracy, low precision, and the like of the prior art.

Description

technical field [0001] The invention belongs to the technical field of electronics and instruments, and relates to a time base frequency real-time calibration frequency measurement method and a device thereof. Background technique [0002] In the frequency meter, the accuracy and stability of the time base frequency determine the highest possible accuracy of the instrument, so a high stability constant temperature quartz crystal oscillator is generally installed in the instrument to generate a built-in time base frequency signal. Because the frequency of the quartz crystal resonator is constantly aging and drifting with time, changes with the change of the ambient temperature, and is affected by the power supply voltage, shock, vibration and changes in the parameters of electronic components, etc., the frequency of the high stability quartz crystal oscillator is also is in a state of change. In this way, when the instrument is measuring, the accuracy of the time base freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/10G01R35/00
Inventor 张学庄朱建军张驰王爱公张艳祥简务人
Owner CENT SOUTH UNIV
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