Leakage Monitoring Of Underground Tap Water Supply Pipeline Based On Wireless Sensor Network Research On Key Technologies

In recent years,with the development of digital electronic technology,wireless communication technology and micro-processing system technology,wireless sensor network(WSN)has made tremendous progress.Accompanied by WSN technology matures,WSN in target detection,monitoring,tracking,control and other fields has been widely used.Thus,we use WSN to monitor pipeline leakage.Based on a large number of data analysis found that three aspects of the WSN sensor nodes exist in the practical application of the pipeline leak monitoring system,one is the energy consumption problem node itself,and second information transmitting node clock synchronization process,the third is the problem of limited storage capacity and the calculation of the node itself.The problem of node energy consumption is closely related to the life cycle of the entire WSN,the problem of node clock synchronization affects the accuracy of data fusion,and the problem of node computing power and limited storage space limits the timely calculation of the location of the leak point after receiving leak information.This thesis focuses on these three problems and serves as the three key technologies of pipeline leakage monitoring system.First of all,access to a large number of relevant literature at home and abroad on the basis of the classic wireless sensor node energy-saving mode in-depth analysis,studies show that energy-saving sensor node has a sleep / wake-up mode the best.Therefore,the completion of WSN nodes through programming at any time sleep / wake up to a certain energy-saving effect.At the same time,after analyzing the classic routing protocol,an improved threshold sensitive energy efficient sensor network protocol(I-TEEN)was selected as the networking routing protocol.I-TEEN added the consideration of the previous round of residual energy when calculating the threshold,and the simulation results show that the performance of I-TEEN has been greatly improved threshold sensitiveenergy efficient sensor network protocol(TEEN).In short,node wake-up and improved by the protocol,so that the node to achieve energy saving on the current maximum extent.Then,after the node wake-up implementation and the routing protocol are optimized,the wireless sensor node networking is used to study clock synchronization.After comparing the classic clock synchronization algorithms,comprehensively considering the advantages and disadvantages of various clock synchronization algorithms,a bidirectional iteration clock synchronization(Bi-iterative)algorithm was selected as the research object and calculated by establishing an affine model frequency offset and phase offset.Simulation results show that the Root Mean Square Error(RMSE)of frequency offset and phase offset is closer to Cramer-Rao Lower Bound(CRLB),which proves that Bi-iterative synchronization has higher accuracy and the algorithm is effective.Finally,using the IOT-NODE433 node with a frequency band of433 MHz and the Raspberry Pi network for actual verification,considering the limitations of the wireless sensor node’s weak computing power,limited storage space,and inability to connect to the Internet,this thesis introduces strong storage and computing power the Raspberry Pi is connected to the routing node,and receives the leakage information returned by the sub-node at any time,and transmits the calculated leakage point location and information to the mobile phone client via the Internet to form a remote pipeline leakage monitoring system.In summary,using the mobile phone client to remotely start the WSN-based pipeline leakage monitoring system,introducing node wake-up and applying the I-TEEN routing protocol greatly saves the node’s energy consumption;introducing Bi-iterative compared to the classic clock synchronization algorithm,synchronization error smaller,improve the accuracy of data fusion;the introduction of strong computing power,storage space large Raspberry Pi,real-time using the correlationalgorithm to calculate the leakage point,and while the results back to the mobile client,improve the speed of data processing system.The realization of a remote pipeline leak monitoring system also provides a theoretical basis for monitoring other pipeline leaks.Therefore,the use of WSN has important theoretical and practical significance for the realization of the underground water supply pipe leakage monitoring.