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Time calibration method and device

A time calibration and calibration ring technology, which is applied to radio-controlled timers and instruments, can solve the problems of time calibration accuracy reduction, large amount of calculation, and poor short-term stability, so as to avoid complex calculations and improve clock accuracy. The effect of high clock output

Inactive Publication Date: 2015-03-25
SICHUAN JIUZHOU ELECTRIC GROUP
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Problems solved by technology

[0004] Because there are various interferences in the transmission process of GPS satellite signals, these interferences will cause certain jitters in the standard time of GPS satellite signals, and the short-term stability is relatively poor, so that when the first method provided by the prior art is used, it will cause The reduction of time calibration accuracy; and when using the second method provided by the prior art, because the kalman filter algorithm is relatively complex, the amount of calculation is large during time calibration, thereby increasing the cost of time calibration

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[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are preferred implementation modes for implementing the present invention, and the description is for the purpose of illustrating the general principle of the present invention, and is not intended to limit the scope of the present invention. The scope of protection of the present invention should be defined by the claims. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection of the present invention. range.

[0035] The time synchronization of the prior art mainly relies on a single GPS satellite signal, and lacks an efficient calibration means, so the reliability, accuracy, efficiency and cost are far from ideal. In the pres...

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Abstract

The invention relates to the technical field of time synchronization, and discloses a time calibration method and device. The method includes the steps that at intervals of a preset period, reference time is generated according to obtained BD / GPS signals; the time interval between the reference time and local time is filtered in a smoothing mode to generate a calibration voltage value; according to the calibration voltage value, the local time is calibrated. According to the time calibration method and device, by the adoption of the BD / GPS bimodule system, the difference between the standard 1 PPS and the local 1PPS is filtered in the smoothing mode, complex operation is avoided, the accuracy of a clock is improved, and high-accuracy clock output is obtained.

Description

technical field [0001] The present invention relates to the technical field of time synchronization, and more specifically relates to a time calibration method and device. Background technique [0002] With the development of smart grids, high-precision, safe and reliable time synchronization is a basic requirement for the operation of contemporary power grids and even future smart grids, so it is necessary to provide a time calibration method to calibrate the local time of devices on the smart grid to achieve Time synchronization of devices within the smart grid. Most of the current synchronous devices use atomic clocks or high-precision constant temperature crystal oscillators in order to obtain accurate time, but the cost of this solution is too high and the size is large, which is not conducive to product design. If you use a general voltage-controlled temperature-compensated crystal oscillator or a voltage-controlled crystal oscillator, then there is a huge limit on th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04R20/02G04R20/04
CPCG04R20/02G04R20/04
Inventor 薛珊珊黄磊张小倩张建国
Owner SICHUAN JIUZHOU ELECTRIC GROUP
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