Research On Realization Of Portable Radio Broadcast Signal Coverage Monitoring System

Referring to the requirements of the State Administration of Radio and Television of China for the establishment and improvement of a modern radio and television monitoring system,this thesis analyzes and studies the practical problems existing in the coverage monitoring of wireless radio signals.The cost of mobile monitoring vehicle equipment is too high as a commonly used monitoring method for wireless broadcast signal coverage monitoring,which is widely used at present.In addition,the broadcast monitoring system on the vehicle often suffers from errors or losses of manually recorded data.Therefore,in order to solve the real problems at present,further improve the coverage monitoring quality of wireless broadcast signals and reduce the corresponding monitoring cost,the thesis designs a new and portable coverage monitoring system of wireless broadcast signals.The specific research contents are as follows:(1)According to the actual investigation results of the current usage of the wireless broadcast signal coverage monitoring equipment,this thesis proposes the overall architecture design of the portable wireless broadcast signal coverage monitoring system,and makes a functional analysis of the components of the front-end receiving equipment and the back-end management system.(2)Based on the receiving principle of wireless broadcast signals,the design of the receiving module is completed with the special pull rod antenna and the receiving chip QN8035.Based on this principle,the module of the processor is designed with chip selection and programming to complete the design of this part The power supply and USB interface are designed to complete the power supply and the connection between the front receiving equipment and the mobile phone,which can transmit data.Analyze the process of audio signal encoding and decoding,complete the design of audio encoding and decoding module,and complete the assembly of each module of front receiving equipment through the design of PCB board.(3)Through the analysis of the software development platform and tools and the design requirements of the background management system,the appropriate platform and tools are selected for the design and development of mobile app,UDP communication terminal,background management terminal and database and the whole software part is completed.The background management system can provide monitoring personnel with the functions of querying data,retrieving map information and so on,and can also store the data collected by the system,so that monitoring personnel can timely grasp the usage of wireless broadcast signal frequency and interference data and evidence according to the data.By using the portable wireless broadcast signal coverage monitoring system designed in this thesis,the testers conducted field tests on the wireless broadcast signal(FM 90.8MHz)transmitted by Anhui Radio and Television Station in Hefei city and Hushan Expressway.The test results manifest that the monitoring system can obtain the frequency,field strength,signal-to-noise ratio and other parameters of the wireless broadcast signals in different environments,and can effectively locate the illegal radio stations and other interference sources nearby,effectively monitor,monitor and record the wireless broadcast signals,and analyze the audio frequency spectrum.The front receiving equipment of the monitoring system does not need to be equipped with special personnel and vehicles,and can be directly deployed on a fixed point for data transmission through a public network,which can realize 24-hour uninterrupted automatic monitoring.The monitoring system designed in this thesis has the characteristics of small equipment volume,convenient installation and carrying,low cost,simple monitoring operation method,high monitoring accuracy,etc.Meanwhile,it has the function of data automatic storage and transmission,which can greatly reduce the cost of wireless broadcast signal coverage monitoring and improve the quality of wireless broadcast signal coverage monitoring,which is of great significance for purifying China's electromagnetic space and maintaining communication safety.