Research On Synchronization Model Of Pulse Coupled Oscillators For Chain Wireless Sensor Networks In Underground

The construction of underground coal mine safety information supervision system can effectively prevent the occurrence of underground accidents.With the development of wireless communication and sensor technology,wireless sensor network,as the contact channel between the physical world and the computer system,can timely perceive underground information and ensure the safety of underground personnel.Sensor nodes connect without any centralized infrastructure,and if the time of the wireless sensor network is not synchronized accurately,the basic information will not be delivered accurately.Therefore,time synchronization is a prerequisite for wireless sensor network applications.Research on the time synchronization technology of wireless sensor networks in underground coal mines.The physical structure of the roadway in complex coal mine environment is diverse.Therefore,the inherent properties of the underground network put forward new requirements for the time synchronization mechanism of wireless sensor networks.Such as the problem of error accumulation in the process of multi-hop network synchronization,obstacles in the underground environment restrict the communication between sensor nodes,and the construction of a wireless sensor network topology suitable for underground tunnels.Inspired by biology,the theory of pulse-coupled oscillator is an effective solution for self-organizing synchronization of wireless sensor networks.Because the Pulsecoupled oscillator model can achieve cost-effective physical layer synchronization through pulse transmission instead of packet switching,this is very attractive for low-cost sensor nodes,and it is a distributed strategy that does not require the selection of root nodes or leaders Node to synchronize the network.Based on the firefly synchronization mechanism of pulse-coupled transmission,this paper conducts time synchronization research for wireless sensor networks in the special environment of coal mines.The main research contents are as follows:(1)A pulse-coupled oscillators synchronization model with different couplings is proposedAiming at the problem of synchronization error accumulation in the multi-hop transmission process in wireless sensor networks and the weak computing power of low-cost sensor nodes,this paper proposes a linear pulse-coupled oscillators synchronization model with different couplings based on the linear pulse-coupled oscillators model.This model introduces a negative coupling factor based on only positive coupling,and constructs the coupling strength of the fusion of positive and negative.Establish a method of fusion of excitation coupling and suppression coupling to optimize the phase coupling,so that the phase reaches the threshold faster to generate a coupling mapping,thereby improving the network synchronization speed.(2)A chain ring network topology suitable for underground tunnels is constructedThe physical environment of the underground coal mine is completely different from that of the ground,and the usual two-dimensional network topology cannot be directly applied in the intricate and complicated roadway of the underground coal mine.A chain network topology for underground coal mines is proposed.This topology establishes a two-way chain loop in the tunnel,and forms a ring network of nearest neighbor connections in areas such as local working faces.The networks are connected through gateways to form a macroscopic view.The chain-like network fits the geographic shape of the underground roadway.(3)A linear pulse-coupled oscillators synchronization model with coupling delay is proposedIn wireless sensor networks,communication delay is inevitable.Due to the particularity of the downhole,propagation and processing delay factors are introduced into the linear model,a linear pulse-coupled oscillators synchronization model with coupling delay is proposed,and analyzed the synchronization process and synchronization conditions of the wireless sensor network with transmission delay.Through the actual realization of the proposed model in the wireless sensor networks simulation framework,the results show that the model achieves synchronization in a chained wireless sensor network with delayed nearest neighbor communication,and provide a certain reference role for pulse-coupled oscillators synchronization model analysis and research in wireless sensor network.