Design And Implementation Of Wireless Sensor Network Data Verification System Based On Mobile Aggregation Node

Wireless Sensor Networks(WSNs)are multidisciplinary integration technology that integrates embedded development,wireless network communication,sensor technology and distributed technology.With the rapid development of Internet of Things technology,WSNs has received great attention as scholars at home and abroad,and have been widely used in public security,industrial and agricultural production,smart cities and military readiness.The data verification system of WSNs was designed,which aims at collecting and transmitting environmental data(illumination,temperature and humidity)in monitoring area to remote server,and remote server can verify the monitoring data and provide stable and reliable monitoring data for the decision-making of the monitors.The thesis mainly completes the following parts of the work:Firstly,a sensor terminal node for collecting environmental information is designed.The collected information is transmitted to the sink node by establishing ZigBee network and LoRa network.The terminal data is sent to the remote server through two links from the fixed sink node and the mobile sink node,respectively,to complete the function of information acquisition.It mainly involves the selection of sensor components,schematic drawing,circuit board welding debugging and module programming.Then,a mobile sink node for information transmission is designed to realize that the mobile sink node receives terminal node data through LoRa network and forwards it to the remote server through WIFI while navigating along the specified trajectory.The mobile sink node uses nine photoelectric tracing sensors to identify the path,and the STM32 Microcontroller coordinates the steering gear module and the driving motor module to realize the movement of the sink node.Combined with engineering experiment and theoretical calculation,When adjusted the PID parameters using the method of combined with engineering experiment and theoretical calculation,which greatly simplifies the debugging workload and ensures the speed stability of mobile nodes during cruising.Finally,a distributed link diagnosis algorithm for data validation is proposed.The sensor data transmitted by different links are checked to determine the status of different communication links,and the data transmitted by communication links with higher accuracy is selected as the final node data.In addition,this paper builds a simulation platform using MATLAB software and LabVIEW software.The simulation experiments verify that the algorithm can diagnose the wrong links,and visualize the fault nodes to provide reliable decision-making basis for the monitors.