Method and device for correcting local time

Abstract

The invention provides a local time calibration method and a local time calibration device. The local time calibration device comprises the steps that: a server obtains timing time of two time pointsand a number of crystal oscillators of the server at the two time points; and whether to calibrate local time of the server by means of the timing time is determined according to the timing time of the two time points and the number of the crystal oscillators of the server at the two time points. The local time calibration method and the device do not rely on the local time of the server, determine whether to calibrate local time of the server by means of the timing time according to the timing time of the two time points and the number of the crystal oscillators of the server at the two timepoints instead of fixedly adopting a local clock or a timing clock, and can calibrate the time of local time by means of the external timing time (the counting of crystal oscillators is very difficultto change) when the local time of the server is changed manually and the timing time is valid, thereby achieving the bidirectional stability of the clock system of the server.

Description

technical field [0001] The invention relates to the technical field of computer processing, in particular to a method and device for correcting local time. Background technique [0002] The automatic train monitoring system of urban rail transit (hereinafter referred to as the system) is a distributed system with a high degree of automation. As a distributed system, a large amount of information is transmitted between various components and components. The logical relationship between these information is It is closely related to timing, so the unified system clock is a very important part of the system. Once the system clock jumps, it will cause the system to be transferred to manual operation, which will drastically reduce the monitoring efficiency. [0003] The server's local clock is a source of the system clock. Due to the accumulation of server crystal oscillator errors and artificially changing the server's local clock, the server's local clock has a certain probabil...

AI Technical Summary

Problems solved by technology

[0005] The working principle of other existing protection technologies is that when the time service clock is far from the local clock, the system clock is only corrected by the local clock, and the time service clock is not used for time correction. This method takes into account the correlation between the system clock and the last time correction. , so it has a certain protection ability, but in the case of artificially changing the local clock of the server, the timing clock will also lose its function at the same time, eventually causing the system clock to jump

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