Study On Inclination Monitoring Technology With NB-IoT

With the increasing level of digital management in cities,obtaining the real-time status of municipal infrastructure becomes an important demand to realize smart cities.As an important infrastructure of urban pavement,well cover has a wide distribution,a large number,and serious consequences after loss or damage,which consumes a lot of manpower and material resources in daily management and maintenance.In order to realize the monitoring and alarm of well cover state,many solutions have been put forward in the industry.However,in these methods,image-based monitoring has serious problems affected by light,occlusion,theoretical algorithm and other factors;combined with Zig Bee’s monitoring terminal,it is difficult to balance current consumption and signal transmission capacity;combined with radio frequency identification,mechanical locking scheme,there are problems such as inaccurate identification and difficult interaction.Among them,if the second method can solve the communication problem,it can better realize the well cover state monitoring and alarm。In the field of wireless communication,lpwan(low power wide area network)technology,represented by Lora and NB-Io T technology,is proposed.This kind of technology adapts to many terminal applications in the bottom layer of the Internet of things,which have strict energy consumption requirements,wide distribution range and poor communication environment.It can perfectly solve the problem of data communication in the well cover terminal.Compared with Lora,NB-Io T has more advantages in the field of municipal monitoring due to its characteristics in development,base station deployment,cloud data platform,etc.Combining with NB-Io T,this paper proposes a dip angle monitoring technology based on NB-Io T,designs a set of well cover condition monitoring system,realizes the collection,transmission and management of the abnormal information of well cover dip angle.The main contents of this paper are as follows:1.Research on the key technology of tilt angle monitoring.Firstly,Euler angle is introduced to describe the inclination angle,and a set of conversion method from sensor data to Euler angle data and inclination alarm data is designed based on the measurement data obtained by acceleration sensor.Then,the communication performance of NB-Io T is analyzed,and its performance in practical application is tested,mainly including NBIo T attached to the network,connected state,idle state and off state Current consumption test of sleeping state,analysis and test of edrx,PSM,rai and other mechanisms.2.The angle monitoring system is implemented in the application scenario of well cover monitoring.The whole monitoring system can be roughly divided into two parts,well cover condition monitoring terminal and user monitoring platform.The well cover condition monitoring terminal includes the hardware design and software implementation of the terminal,including micro control module,NB-Io T communication module,acceleration sensor module,real-time clock module and terminal power module,etc.the data is uploaded to the user monitoring platform through UDP communication.The user monitoring platform is developed based on Lab VIEW and My SQL database to realize data receiving,processing,storage and analysis of well cover status data.3.Combined with the performance test analysis of NB-Io T and the design and implementation of the application scenario in this paper,the advantages and disadvantages of NB-Io T technology compared with other lpwan technologies are analyzed,and the suitable application scenarios different from other technologies are summarized,and the possible application of NB-Io T technology in the Internet of things is prospected.