Time synchronization method of distributed mine seismic monitoring system

Abstract

The invention discloses a time synchronization method of a distributed mine seismic monitoring system, relating to a time synchronization method. Two time synchronization algorithms are designed for nodes in clusters and cluster head nodes of the clusters and refer to an intra-cluster slope consistency time synchronization algorithm and an inter-cluster simplified clock phase offset frequency offset joint estimation algorithm. First, nodes in the clusters synchronize clocks of all nodes to a unified virtual logic clock of the whole network through an STS synchronization algorithm, and then the cluster head nodes and anchor nodes are synchronized through an SJMLE algorithm, so that a synchronous operation between cluster head nodes is realized indirectly. A hardware platform experiment and simulation analysis are performed on the intra-cluster time synchronization algorithm and the inter-cluster time synchronization algorithm, and experiment and simulation results verify the effectiveness of the algorithms and prove that the synchronization algorithms have high robustness, expandability and high synchronization accuracy. The method fully combines advantages of the distributed time synchronization algorithm and the structural time synchronization algorithm, and can adapt to a special environment in which the mine seismic monitoring system is.

Description

technical field [0001] The invention relates to a time synchronization method, in particular to a time synchronization method of a distributed mining earthquake detection system. Background technique [0002] Generally, coal enterprises use distributed mining earthquake detection system for monitoring and early warning, and time synchronization in distributed mine earthquake monitoring system is an important supporting technology. A unified clock standard is a necessary condition for the data transmission regulation and data analysis application in the distributed mining earthquake monitoring system. The hardware platforms and operating systems are different, resulting in different clock hardware implementations and programming interface standards for each node. In addition, the quartz crystal oscillator and clock interruption of each node further affect the unity of the clock source. Due to different manufacturing processes, even the same type of crystal oscillator has dif...

AI Technical Summary

Problems solved by technology

[0003] Various existing time synchronization protocols are applicable to various conditions and scenarios. However, the distributed microseismic monitoring system has a large number of nodes, limited energy, weak hardware performance, and variable topology

In addition, the existing time synchronization protocols are subject to certain limitations when applied in coal mines. For example, structural time synchronization protocols cannot adapt to large-scale wireless networks, and distributed time synchronization protocols cannot quickly and effectively complete time synchronization operations.

Therefore, the design of time synchronization protocols for underground wireless sensor networks still faces many challenges, such as the relationship between synchronization accuracy and communication delay, the balance between convergence speed and low power consumption, etc.

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