Research And Implementation Of Spectrum Monitoring System Based On Software Radio

With the development of radio technology,communication is more convenient,but it also makes the spectrum resources more crowded,and increases the difficulty of spectrum monitoring.In order to avoid malicious use of spectrum resources and provide reference for spectrum planning,real-time monitoring of these radio signals is needed.With the development of communication technology,the frequency band of interference signals is wider and the burst time is shorter,which brings great challenges to the supervision of technical equipment.Real-time spectrum monitoring system can provide more efficient future communication solutions for radio monitoring,improve the efficiency and accuracy of radio communication,and has great application value.In this paper,a portable spectrum monitoring system which can be directly connected to a computer is designed for radio monitoring.Firstly,the main research work of the spectrum monitoring system at home and abroad is investigated,and the software radio architecture is adopted to design the spectrum monitoring system.Then complete the design of SDR core board and digital main control board of system hardware platform.The SDR core board uses AD9361 chip to amplify,filter,and convert the RF signals received by the antenna to baseband,and then send them to the digital main control board for signal processing after analog-to-digital conversion.The Zynq chip is used in the digital main control board,and the logic array resources in it are used to decode,synchronize,FFT,and estimate the power spectrum of the period graph.Then the processed signals are packaged and sent to DDR for storage.The ARM processor kernel is used to further process and send the data to the upper computer for display through gigabit Ethernet.Then the software system is designed.C/S architecture is adopted,and C language is used in the Server.Data is sent to the upper computer through the Lw IP communication module,and instructions sent by the upper computer are analyzed to control the underlying hardware.The Client side uses MATLAB APP to realize the GUI design.By enabling the control to write parameters,calling the instruction module,and interacting with the Server through Lw IP,the power spectrum data received is drawn on the upper computer interface.Finally,the whole system has been tested comprehensively,including the system hardware test,system software test and system function test.The results show that the designed spectrum monitoring system meets the requirements of indicators.