Research And Implementation Of Clock Synchronization Key Technology In WSN

In recent years,wireless sensor network has aroused great attention from the whole world and been widely used in many fields.Among them,time synchronization technology is one of the key supporting technologies.Because each sensor node only operates on a unified time basis,the collected information is of value.However,the power of wireless sensor networks is provided by small batteries,and there often exist problems that storage capacity and resources for processing and computing are limited,which brings great challenges to clock synchronization technology.Therefore,time synchronization technology is a key factor to the reliable operation of sensors.Firstly,the concept and key technology of wireless sensor network are briefly introduced,then the time synchronization technology is introduced in detail,and the basic methods of realizing clock synchronization are described.Secondly,the random delay distribution in wireless sensor network clock synchronization technology is analyzed in detail and the data sampled on the experimental platform of adjacent nodes are verified by statistical test method.Based on the gaussian random delay distribution,the relative frequency offset and relative phase offset of adjacent nodes are calculated,and the time synchronization of nodes is realized on the hardware platform.Finally,based on the overhearing protocol,an improved algorithm of energy saving based on Kalman filter is proposed.The algorithm uses Kalman filter algorithm to estimate the clock deviation of the super node and the listening node in the network,and compensates the clock.The simulation results and hardware experiment results show that the proposed algorithm can greatly reduce the energy consumption and save the storage space of sensor nodes on the premise of satisfying certain synchronization accuracy.