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A kind of oscpps correction method and device

A consistent and time-scaled technology, applied in the direction of pulse generation, electrical components, and electric pulse generation, can solve the problem of large cumulative error of OSCPPS

Inactive Publication Date: 2017-05-24
XJ ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this invention is to provide a kind of OSCPPS correcting method and device, in order to solve the problem of large accumulated error of OSCPPS

Method used

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  • A kind of oscpps correction method and device
  • A kind of oscpps correction method and device
  • A kind of oscpps correction method and device

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] The basic scheme of the correction method of the present invention is: a kind of OSCPPS correction method, and the steps are as follows:

[0026] 1) Obtain the current rising edge time stamp T1 of OSCPPS 0 and GPSPPS current rising edge time scale T2 0 ; The second pulse interval of OSCPPS is ΔT1, and the second pulse interval of GPSPPS is ΔT2;

[0027] 2) When GPSPPS is valid, judge whether OSCPPS is ahead of GPSPPS;

[0028] 3) Calculate and determine the next second pulse output time T1 1 =T1 0 +ΔT1, if OSCPPS is ahead of GPSPPS, then ΔT1 will increase the set time ω; if OSCPPS lags behind GPSPPS, then ΔT1 will decrease the set time ω; if they are in the same phase, then judge whether the step lengths of OSCPPS and GPSPPS are consistent; if they are consistent, then ΔT1 will increase If the set time ω is inconsistent, ΔT1 will be reduced by the...

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Abstract

The invention relates to a method and a device for correcting OSCPPS. The method comprises the steps of obtaining the current rising edge time scale T10 of the OSCPPS and current rising edge time scale T20 of GSCPPS, obtaining the PPS interval delta T1 of the OSCPPS and the PPS interval delta T2 of the GSCPPS, determining whether the OSCPPS is before the GSCPPS under the circumstance of effective GSCPPS, calculating to determine the next PPS output moment T11=T10+delta T1, and if the OSCPPS is before the GSCPPS, adding set time omega to the delta T1, if the OSCPPS lags after the GSCPPS, reducing the set time omega from the delta T1, in case of the same phase, determining whether the step length of the OSCPPS and the step length of the GSCPPS are consistent, and if so, adding the set time omega to the delta T1, otherwise, reducing the set time omega from the delta T1. According to the method, the phase difference of the OSCPPS and the GSCPPS is compared in real time, the correction of the OSCPPS is realized by use of a method of slowly increasing or reducing the count of the OSCPPS intervals inside an FPGA, and finally the purpose of stable output of the OSCPPS following the GSCPPS is achieved.

Description

technical field [0001] The invention relates to a method for realizing temperature output of a crystal oscillator second pulse (OSCPPS), that is, a correction method. Background technique [0002] With the development of smart substations, higher requirements are put forward for the stability and reliability of the output clock of the clock synchronization device. The design specification requires that the output jump of the second pulse should not exceed 0.1μs. The original scheme of directly providing the output clock only by the reference signal obtained by satellite timing is unreliable, because after adding multiple reference signal inputs, there will be uncontrollability in the process of clock source switching, and the out-of-synchronization reference will be directly If the source is switched to a synchronous reference source, it is very likely to cause abnormal jitter of the output clock; in the state of punctuality, the accuracy requirement is ≤1μs / h, and re-synchr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K3/011
Inventor 郑拓夫周水斌闫志辉史会平郝威
Owner XJ ELECTRIC
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