Clock synchronization and fault feedback method and device

Abstract

The invention provides a clock synchronization and fault feedback method, which comprises the following steps: after a slave clock receives a first message sent by a first master clock, calculating to obtain a first local clock correction value needing to be corrected by a local clock and a first maximum correction value needing to be corrected by the slave clock; after the slave clock receives a second message sent by the second master clock, calculating to obtain a second local clock correction value needing to be corrected by the local clock and a second maximum correction value needing to be corrected by the slave clock; the first local clock correction value is compared with the first maximum correction value, the second local clock correction value is compared with the second maximum correction value, and a fault identification result and a clock synchronization result of the slave clock are determined based on clock synchronization and fault identification criteria. According to the invention, whether the message sent by the master clock device is lost or has a wrong value is detected, and clock synchronization and fault positioning of the slave clock can be completed; in addition, a double-master-clock structure is adopted, so that the problem of transient failure of a single master clock is solved.

Description

technical field [0001] The invention relates to the field of electronic science and technology, in particular to a clock synchronization and fault feedback method and device. Background technique [0002] The full name of IEEE 1588 is a precision clock synchronization protocol standard for network measurement and control systems. The IEEE1588 protocol can generally improve the timing synchronization capability of the network system, and is compiled with reference to Ethernet, which can enable the distributed communication network to have strict timing synchronization. [0003] In the prior art, under the IEEE 1588 protocol, a Kalman filter is used for frequency compensation and clock compensation in order to achieve clock synchronization, but it does not solve the problems of network packet loss and transient failure of the master clock. [0004] In another prior art, the maximum difference detection algorithm is used for fault tolerance with large transient errors of the m...

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Problems solved by technology

[0003] In the prior art, under the IEEE 1588 protocol, a Kalman filter is used for frequency compensation and clock compensation in order to achieve clock synchronization, but it does not solve the problems of network packet loss and transient failure of the main clock

[0004] In another prior art, the maximum difference detection algorithm is used for fault tolerance with large transient errors of the master clock, but it is only applicable to fault tolerance with large transient errors of the master clock, it does not involve the general situation, and cannot solve the problem of message Lost situation

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