| Radio spectrum resources are recognized by the industry as scarce production factors,valuable information assets and intangible strategic resources.In recent years,the number of devices capable of transmitting and receiving radio signals has exploded,and various organizations have extremely large demands for real-time frequency domain measurement and monitoring analysis of wireless signals.The use of software radio technology to realize real-time wireless spectrum detection,analysis and management is a flexible,simple and cost-effective solution,and is also the development direction for realizing customized wireless signal spectrum monitoring and analysis in the future.However,FFT operations for spectrum analysis in current schemes rely on the PC,which limte the simple rate,analysis bandwith and exacution spee of schemes.This paper reviews the development of spectrum analysis and software radio in recent years,focusing on the fast Fourier transform theory,energy detection method and software radio architecture.We systematically analyses the working principle and design method of spectrum analyzer in different periods,explores the relationship between device technology development and design scheme,and forms a fast Fourier transform-based energy conversion detection method and technical path of IF digitization scheme.Through the research on the modules and elements of the RF front-end and software development framework of software radio,the software and hardware architecture design scheme of signal detection system based on spectrum analysis is completed,the development environment is constructed,the signal detection system based on spectrum analysis via radio on chip is realized by using FPGA on USRP.Finally,the main functions of the system are tested and verified. |
