sensor network

Time synchronization is crucial for wireless sensor network,which is a new distributed network system.Traditional synchronization protocol,such as cheap evening dresses (Network Time Protocol) which can be good applied on Internet and GPS(Global Position System) which can keep pace with UTC(Universal Time Coordinated),can not fit wireless sensor network due to its particularity.Some typical synchronization protocol that design for network characteristics developed the synchronization technologies.However,these excellent technologies can not be applied sell discount wedding dresses efficiently for large-scale wireless sensor network.This thesis adopts new synchronous method to fit large-scale wireless sensor network.It trace back to the attention of synchronously blog new shirts 2010 flashing fireflies.The mutual synchronization model can be found in the situation of pacemaker cells of heart and circadian pacemaker of neural networks.Simulated the synchronous discount wedding gowns principle of these biological model,Peskin pulse-coupled oscillator model was been polo shirts shop constructed.More generalize model-M&S model is the base of this thesis research work.This thesis presents an improved pulse-coupled oscillator model base on M&S model,which spurn complex firing function for the discount wedding prom dresses characteristic of wireless sensor network.Instead,adopting linear function avoid the limitation of computing capability,and save power consuming.To consider inherence difference of sensor crystal oscillators,model exhibit difference frequency.According to the mathematical deduction,first we prove two linear pulse-couple oscillators with different frequency can reach and maintain synchronization,and presents instantaneous synchronous condition and synchronous maintaining condition.Then extending to multi-oscillators situation,we prove the system can reach and maintain synchronization,and presents instantaneous synchronous condition and synchronous maintaining condition. Experiment proves that the mutual synchronous mechanism base on linear pulse-coupled oscillator with different frequency can make wireless sensor network reach whole net synchronization at a time.Moreover,synchronous precision can reach microsecond level.
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