Method for determining optimal master block among distributed node clocks of network system

Abstract

The invention discloses a method for determining an optimal master block among the distributed node clocks of a network system, and aims to provide a method for determining a node clock with the most stable and accurate performance among the distributed node clocks of a network system as an optimal master block. According to the technical scheme, the method comprises the following steps: (a) N distributed node clocks are provided, wherein the distributed node clocks broadcast to the system X times according to the independent clock internal T1 thereof; (b) each distributed node clock receives the X broadcasts of the other distributed node clocks, and sorts the other distributed node clocks in each broadcast according to the time order; (c) each distributed node clock calculates the variance of reaching sequence of the other distributed node clocks; and (d) one distributed node clock is determined as the optimal master clock of the network system based on the variance. External interference is well avoided, there is no need for an additional clock source or other auxiliary devices, the node clock with the most stable and accurate performance in the network is selected as the optimal master clock, and the procedure of optimal master clock selecting is simplified greatly. The method is simple and reliable.

Description

technical field [0001] The invention relates to the technical field of precise clock synchronization, and more specifically relates to a method for determining an optimal master clock in distributed node clocks of a network system. Background technique [0002] The determination of the optimal master clock in the prior art basically adopts the following three methods: 1. According to the crystal oscillator type of the respective clock sources; 2. Using GPS timing as the reference object; 3. Arbitrarily designating a node as the reference object. The above methods all have shortcomings. Arbitrarily specifying a node as a reference object for clock synchronization will cause the clock of the entire system to be in an inaccurate and stable state; the GPS timing method is expensive and extremely inconvenient to use. Although the performance of the reference clock is stable, it cannot The entire synchronization process is extremely limited; the method of comparing clock source cr...

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Problems solved by technology

The above methods all have shortcomings. Arbitrarily specifying a node as a reference object for clock synchronization will cause the clock of the entire system to be in an inaccurate and stable state; the GPS timing method is expensive and extremely inconvenient to use. Although the performance of the reference clock is stable, it cannot The entire synchronization process is extremely limited; the method of comparing clock source crystal oscillators also has certain limitations, and at present, the clock frequency of each node is mostly through phase-locked frequency multiplication. The node clock performance is not only related to the type of crystal oscillator, but also related to phase-locked frequency multiplication Methods, device suppliers, processing methods and other factors are related, and it is difficult to directly compare

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