Research Of Urban Noise And Light Pollution Monitoring System Based On NB-IoT

The sustained and rapid development of the national economy has brought about a series of ecological environment problems.The noise pollution from all aspects of urban traffic and social life as well as light pollution caused by unreasonable installation and use of light sources and lamps pose a great threat to people's physical and mental health.At the same time,the balance of the ecosystem has been seriously damaged.However,the existing noise and light pollution monitoring systems have many disadvantages,such as troubled network deployment,small network coverage and poor stability of data communications.Moreover,the traditional luminance meter has a small field of view,which leads to cumbersome and complex operation when measuring the average luminance of the environment.It is difficult to deal with environmental noisepollution and light pollution because their time distribution is not continuous and spatial distribution is wide.In order to obtain the real level of noise pollution and light pollution in a large area,distributed monitoring nodes need to be arranged in the monitoring area to continuously monitor the noise pollution and light pollution in the surrounding environment all day.In this dissertation,the urban noise and light pollution monitoring system based on NB-IoT(Narrowband Internet of Things)is proposed.The system is mainly composed of distributed noise and light pollution monitoring terminal modules and Web application software.With the NB-IoT wireless communication technology,a noise and light pollution monitoring network is set up to realize real-time monitoring of noise and light pollution all day.The main contents of this dissertation are as follows:First,this dissertation designed a large field of view luminance meter.The traditional luminance meter has a small field of view.And the design of a large field of view luminance meter has been completed based on the traditional luminance meter,which can directly measure the average luminance within the field of view.At the same time,multi-angle monitoring of the luminance around the monitoring point can be achieved with omnidirectional Pan-Tilt that can rotate vertically and horizontally.Second,based on the terminal modules of noise and light pollution monitoring,the NB-IoT technology is proposed to build a distributed noise and light pollution monitoring network system and the design of the system hardware platform is completed in this dissertation.The monitoring system consists of sensor detection,data transmission and application software.And the monitoring system utilizes the features such as broad coverage,low power consumption and large connection of NB-IoT to realize the reporting of monitoring data and the receiving of ordered commands.The system hardware circuit is modular,including the core controller module based on STM32 series microprocessor,the NB-IoT wireless communication module and the related peripheral interface circuit.The performance is reliable,and it is convenient for the later upgrade and maintenance,which provides a guarantee for the stable operation of the system.Third,this dissertation designed the data transmission format of the monitoring system,and completed the design of the system software modules based on this.Software modules include embedded software programs and Web application software programs.The embedded software is responsible for the unified scheduling of various hardware modules to ensure the stable and orderly work of the monitoring system.Besides,this dissertation completed the database design of the monitoring system based on the relational database MySQL server.Web application software implements the management of user information and the storage and query functions of monitoring data.In addition,the monitoring noise and light pollution data are visualized based on the geographic information system on the monitoring system software platform.