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针对分布式微震监测系统对时间同步算法性能的较高需求,提出了一种分布式与结构式相结合的新型最优一致性时间同步算法(OCTS).根据微震监测系统的同步网络的特点,将OCTS算法设计为两个子过程:斜率一致性同步和基于无线传感器时间同步协议(TPSN)的相偏频偏联合简化估计.首先,采用了斜率一致性分析方法,将所有节点都同步到网络中时钟斜率最接近真实时间斜率1的节点的时钟上;然后,为了实现多矿区多系统的数据联合分析,在TPSN同步方法的基础上采用简化的极大似然估计方法实现相偏频偏的联合估计,将网络全局逻辑时钟同步到锚节点时钟上,保证多系统数据之间的时间有序性.实验结果验证了所提算法的有效性,证明了OCTS算法具有较强的鲁棒性、可扩展性及良好的同步精度,能适应微震监测系统所处的特殊环境.
Aiming at the high demand of distributed microseismic monitoring system for the performance of time synchronization algorithm, a new optimal consistency time synchronization algorithm (OCTS) based on distributed and structural combination is proposed.According to the characteristics of synchronous network of microseismic monitoring system, The OCTS algorithm is designed as two subprocesses: Slope-consistent synchronization and phase-shifted skew estimation based on Wireless Sensor Time Synchronization Protocol (TPSN). First, a slope consistency analysis method is used to synchronize all nodes to the network clock Then, in order to realize the multi-system data joint analysis in multi-mine area, the simplified maximum likelihood estimation method is used to realize the joint estimation of phase offset frequency offset based on the TPSN synchronization method , Which synchronizes the global logic of the network to the clock of the anchor node to ensure the time ordering between the multiple system data.The experimental results verify the validity of the proposed algorithm and prove that the OCTS algorithm is robust and extensible And good synchronization accuracy, can adapt to the special environment in which microseismic monitoring system is located.