Design And Implementation Of LoRaAd-Hoc Network System For Mine Temperature And Humidity Monitoring

In recent years,underground disasters have occurred frequently.In order to ensure the safety of underground operators,it is necessary to monitor underground environmental parameters,among which temperature and humidity are very important indicators of underground environmental parameters.For the problems of high cost and difficulty of wired network deployment in the underground environment,wireless Ad-Hoc network technology provides a new technical solution for the monitoring of underground temperature and humidity,and realizes low-cost and rapid deployment of underground temperature and humidity to realize real-time monitoring.Based on this background,this thesis adopts the scheme of combining LoRa technology and wireless Ad-Hoc network to realize a low-cost,low-power,and easy-tomaintain underground temperature and humidity monitoring system to ensure real-time monitoring and stable transmission of underground temperature and humidity data.The main research done in this thesis is as follows:(1)Analyze the transmission characteristics of underground wireless signals.On the basis of analyzing and comparing different wireless technologies,select LoRa communication technology with long distance,strong anti-interference and low power consumption,and analyze its characteristics and advantages in underground applications,which provides a theoretical analysis basis for the LoRa communication scheme.(2)Propose the underground LoRa self-organizing network scheme,firstly analyze the network scheme of Mesh long-chain structure suitable for the underground environment.The PEGASIS protocol applied to this scheme will lead to too long network delay due to the long chain.Due to the shortcomings of heavy node load,the TSCP protocol is proposed to solve the problem of too long chain,and the optimization of the improved performance is verified through simulation experiments.Combined with this protocol,the Ad-Hoc network structure of this thesis is formed.(3)Combined with the Ad-Hoc network scheme proposed in the thesis,the system networking is designed and implemented,and a method of allocating fixed time slices is proposed for the conflict problem when nodes transmit data after successful networking.Combined with the application scenarios in this article,ensure the normal upload of temperature and humidity data.According to each realization link in the overall communication process of the networking,different types of packets are designed,and the composition of the packets is analyzed and processed in detail.Finally,the system networking performance is tested,including LoRa node module point-to-point communication distance test,temperature and humidity acquisition and transmission test,networking capability test,and the test results are analyzed.The test results show that the underground temperature and humidity monitoring system designed in this thesis has the characteristics of wide coverage,easy maintenance,and flexible networking.