Statistical Analysis Of Indoor Electromagnetic Radiation Field

With the widespread use of communication technology and communication equipment,the indoor electromagnetic environment is full of electromagnetic wave signals emitted by various emission sources.The movement of people and the use of movable emission sources will cause the indoor electromagnetic distribution to change dynamically.However,the irregularity and imperceptibility of the electromagnetic environment make it particularly difficult to study its dynamic characteristics.The purpose of this thesis is to obtain important indoor electromagnetic radiation field statistical laws through the monitoring and analysis of a large amount of indoor monitoring data.Understand the statistical characteristics of indoor electric field radiation field distribution,summarize and analyze the statistical characteristics of indoor electromagnetic field distribution through a large amount of data.First,determine the location of the monitoring point adaptively in the indoor monitoring experiment,and then select 4 locations suitable for long-term monitoring based on the monitoring location distribution and the integrated field strength at that location.A large amount of data is obtained through long-term monitoring,combined with the characteristics of the box-plot in statistics and national standards for research.The electric field box-plot can not only reflect the original data distribution characteristics,but also visually display the electromagnetic radiation field statistics such as E_max,E_min,E_mid,E_(95%),E_(80%).Combined with the modified electric field box-plot,the data are analyzed,and the influence of frequency band,time period,monitoring point location and other factors is studied.For the electric field box-plot of different frequency bands,because the indoor and outdoor electronic equipment mostly uses 4G frequency band,the box-plot of 1805-1880MHz frequency band is the highest.For different monitoring points,the box-plot of electric field varies greatly,which is caused by the flow of indoor personnel and mobile emission source.The analysis results show that the comprehensive field strength and environmental quality evaluation parameters in 800-3000MHz frequency band are in line with the national limit standards.At the same time,the probability density distribution of the integrated field intensity in ten days conforms to Rayleigh distribution.Building an electromagnetic data storage system to store all the raw data obtained by monitoring in a database.The database uses My SQL version 5.1,Visual Studio 2019 as a development tool,and C#language for writing.The designed interface features a brief introduction and easy operation.Design from data import,export,data query,data analysis,etc.,so that the system can upload original files of monitoring data.Considering the large amount of long-term monitoring data and the slow interaction between the client and the server,you can save the data from the database in the form of.sql for subsequent calls.Realize the calculation of the maximum,minimum,median,comprehensive field strength,etc.of the electric field for the queried data on a certain day,and display it on the client.