Clock synchronization method of mine microseism monitoring system

Abstract

The invention relates to a clock synchronization method of a mine microseism monitoring system. Clock consistency matching is obtained for a ground central recording system based on GPS time service.An underground field control station adopts an atomic clock to obtain clock consistency matching. A synchronous clock signal and a timestamp protocol are sent based on the field bus. As both a signalacquisition unit and an on-site control station adopt independent crystal oscillators as clocks, the correlation between the times (x, y) can be used with a series of pairs of data to solve clock correction initial values of the field control station and the signal acquisition unit in a first-order manner by adopting a least square method. The clock frequency of the signal acquisition unit is calibrated for multiple times by utilizing a dichotomy according to a given precision requirement; the method has the advantages that the clock synchronization requirement of large-scale microseism long-time continuous monitoring of a mine can be met, compared with the prior art, the defect that clock error accumulation is large due to continuous long-time collection is overcome, and the method has the advantages of being low in implementation cost, high in synchronization precision, good in reliability and wide in application range.

Description

technical field [0001] The invention relates to a clock synchronization method of a mine microseismic monitoring system. Specifically, the present invention provides a synchronization mechanism and method for timing the field control station and calibrating the clock frequency of the acquisition unit based on a GPS clock or an atomic clock. Background technique [0002] During the mining process, due to the destruction of the ore body and surrounding rock stress in the mine shaft or the stope, elastic deformation occurs, which exceeds the limit equilibrium state of the brittle rock mass that the rock mass can withstand high pressure, and suddenly releases huge energy into the free space. The dynamic phenomena characterized by rapid and violent destruction are called mine dynamic disasters, such as mine rock burst, roof collapse, mine earthquake, water damage outburst, coal and gas outburst, etc. The microseismic monitoring system is a timely monitoring method for dynamic di...

AI Technical Summary

Problems solved by technology

However, this mechanism is not suitable for long-term mine microseismic continuous acquisition. This is because the mine microseismic site control station and signal acquisition unit use an independent crystal oscillator as the clock source, and long-term continuous acquisition will cause clock drift and clock error accumulation, which cannot meet Clock Consistency Requirements for Mine Safety Microseismic Monitoring

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