Research And Implementation Of Low Power Networking Technology In Urban Strong Earthquake Observation

In recent years,earthquake disasters have occurred frequently,causing great losses to our economy and great harm to people's safety.The Tangshan earthquake in 1976,the Wenchuan earthquake in 2008,and the Yushu earthquake in 2010,Which is still daunting.Through the study of the losses caused by the earthquake,it is finally found that most of the losses come from the damage to the infrastructure.Therefore,it is necessary to monitor the structure of these infrastructures and collect and transmit the vibration information of the building during the earthquake.In this paper,Ad Hoc network is used for data transmission,and the AODV routing protocol used for route establishment and the MAC protocol used for control channel are designed.The AODV protocol is mainly designed for the processing flow of three messages: routing request,routing response,and routing error,and by consulting the literature,it is learned that the energy consumed to send a data packet is positively related to the transmission power and transmission distance.In this topic The transmission power of all nodes is 30 d Bm,so the energy consumption is only affected by the transmission distance.In order to reduce energy consumption,it is necessary to select the shortest route for data transmission.Therefore,the AODV protocol in this paper will replace the minimum hops with the minimum transmission distance as the standard for route selection.The design of the MAC protocol uses a carrier sensing mechanism and a binary backoff algorithm to achieve the purpose of improving channel resource utilization and reducing network power consumption.In terms of data acquisition,according to the output signal of the sensor,this article selects the AD4111 chip as the AD converter.Through parameter configuration and preliminary debugging of the AD4111 chip,it can complete the collection and conversion of standard signals.In terms of power supply,the LM7812,LM7912 and LM1084-ADJ voltage regulator chips are used to design a circuit diagram for generating 12 V,9V,5V,4.5V voltage from 220 V mains,and a circuit for automatic switching of battery and power supply is designed.Under normal circumstances,The node can be powered by a wired power supply,and when the wired circuit is damaged,it can be immediately switched to the battery-powered mode.In addition,the configuration of the Lo Ra module and 4G module was also carried out.The Lo Ra module is mainly used for data transmission in the network,and the 4G module is used to transmit data to the cloud server for easy viewing at any time.