Precision compensation method for clock source

A precision compensation and clock technology, applied in the field of precision compensation of clock sources, can solve problems such as poor consistency of compensation effects, low learning accuracy, frequency drift and temperature separation of frequency sources, and achieve the effect of ensuring compensation accuracy

Active Publication Date: 2021-07-02
成都金诺信高科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The traditional punctuality algorithm uses the least square method for curve fitting, the learning accuracy is not high, and the frequency drift and temperature of the frequency source are not separated and compensated separately. Therefore, the traditional compensation effect is poor in consistency. The test is more random

Method used

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  • Precision compensation method for clock source
  • Precision compensation method for clock source
  • Precision compensation method for clock source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A precision compensation method for a clock source, based on a compensation system such as figure 1 , including the following steps:

[0051] Step S1: When the external reference clock is valid, the compensation system tracks the external reference clock to tame the clock in the compensation system, and records the tamed time, temperature and voltage control data in real time, establishes the self-learning data of time, temperature and voltage control data, and Record as RECORIG N ;

[0052] Step S2: Eliminate the abnormal data in the self-learning data, and obtain the corrected effective record data REC N ;

[0053] Step S3: In valid record data REC N In, sort by temperature TEMP to get a new data set RECSortByTemp n , to data group RECSortByTemp n Based on , calculate the frequency drift AgePerDay:

[0054]

[0055] AgePerDay=AgePerDayTemp÷N

[0056] Among them, TIME is time, PWM is voltage control data;

[0057] Step S4, temperature characteristic separat...

Embodiment 2

[0074] On the basis of the above-mentioned embodiment 1, the present invention eliminates abnormal data in the self-learning data in the step S2, based on abnormal changes in quality, external environment and frequency source itself. In the step S2, the abnormal data in the self-learning data is proposed, according to the temperature characteristic analysis of the frequency source, and the matching degree between the temperature of the frequency source and the voltage control.

[0075] The coefficient of determination R in the step S6 2 The maximum value is 1, and the preset threshold is 0.68.

[0076] Working principle: Goodness of Fit refers to how well the regression line fits the observed values. The statistic that measures the goodness of fit is the coefficient of determination R2, whose maximum value is 1. The closer the value of R2 is to 1, the better the fit of the regression line to the observed value; on the contrary, the smaller the value of R2, the worse the fit ...

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Abstract

A precise compensation method for a clock source relates to the field of clock compensation, and comprises the following steps: taming self-learning data, removing abnormal data, respectively separating temperature and frequency drift characteristics, respectively fitting frequency drift and temperature characteristic curves by adopting a multi-time curve fitting mode, and in a time keeping process, and selecting the optimal characteristic for automatic separate compensation. High-precision time keeping is realized, and the problems that a traditional time keeping algorithm adopts a least square method for curve fitting, the learning accuracy is low, frequency drift and temperature of a frequency source are not separated, and the problems that the consistency of the traditional compensation effect is low and the multiple tests are highly random are solved.

Description

technical field [0001] The invention relates to the field of clock compensation, in particular to a precise compensation method for a clock source. Background technique [0002] High-precision punctuality technology is a key technology in the time-frequency field, and the punctuality index is strongly related to factors such as the test environment, test method, and test time. Under different test environments, test methods and test time, the consistency of multiple test indicators is determined by the punctual ability. [0003] (1) Industry Status [0004] The current punctuality algorithms in the industry mainly include: [0005] 1) No compensation, relying on the ability of the crystal oscillator or rubidium clock to keep time; [0006] 2) Use temperature compensation crystal oscillator to improve the temperature characteristics of crystal oscillator; [0007] 3) Simple frequency drift learning and frequency drift compensation; [0008] 4) Test the temperature charac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L1/02
CPCH03L1/02Y02D10/00
Inventor 朱敏曾迎春龚鹏张中正张煜
Owner 成都金诺信高科技有限公司
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