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Method for synchronizing time

A technology of time synchronization and second pulse, which is applied in the direction of synchronization, clocks driven by synchronous motors, electronic timers, etc., can solve the problem of reducing the amount of calculation, and achieve the effect of reducing the amount of calculation, accurate measurement, and compensating for random time errors

Active Publication Date: 2013-12-18
山东国研自动化有限公司
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Problems solved by technology

[0006] The present invention aims to provide a time synchronization method to overcome the above-mentioned defects in the prior art. The technical problem to be solved is: by reconstructing the ideal UTC time-second pulse, the calculation amount is greatly reduced, the hardware cost is reduced, and the high Accurately compensate the random time error of the global positioning system output, and accurately measure the frequency of the high-stable crystal oscillator

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0028] Such as figure 1 As shown, the first line represents the ideal UTC time second pulse, one time pulse per second; the second line represents the second pulse output by the GPS ground receiver, as shown in the figure, the second pulse output by the ground receiver is relatively ideal The second pulse will have a random error, and it has no cumulative error when it runs for a long time; the third line is the second pulse generated after the frequency division of the high-stable crystal oscillator, which is characterized in that the pulse interval from each second pulse is very uniform, but the deviation is the same In the direction of long-term operation, the deviation will gradually accumulate, and its short-term accuracy is worse than that of the GPS ground receiver, while its long-term accuracy is not as good as the latter. The present invention make...

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Abstract

The invention discloses a method for synchronizing time. Single exponential smoothing filtering is respectively carried out on the measured value of a phase position and the measured value of frequency, only last calculation results and the single measured values of this time are used in the calculation process every time, the calculated amount is greatly reduced, and through continuous iterative operations, an algorithm can be stably converged to be close to a statistical expected value. Through the algorithm of the method, low hardware cost can be used, random time errors output by a global positioning system can be compensated in a high-precision mode, the frequency of a high and stable crystal oscillator is measured precisely, and supports are provided for designing a high-precision clock and improving the punctuality accuracy of the clock.

Description

[0001] technical field [0002] The invention relates to an algorithm for reconstructing standard time and frequency with high precision based on the time signal of the global positioning system and the frequency signal of a high-stable crystal oscillator. This algorithm can be widely used in power systems and automation, radio and television, communications and other fields that require high-precision time and frequency synchronization. Background technique [0003] Global positioning systems (including the US GPS system in service, Russia's GLONASS system, China's Beidou system, and the European Galileo system under construction) provide convenient and fast means for global positioning and time and frequency synchronization. Although the time signal calculated from the GPS satellite signal has no cumulative error and has excellent long-term time stability, it is affected by ephemeris error, ionospheric error, tropospheric error, multipath error, receiver error, and excessi...

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Application Information

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IPC IPC(8): G04G7/00G04R20/02
Inventor 华志斌李勇刘兰辉王德胜侯友忠
Owner 山东国研自动化有限公司
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