Design And Development Of Embedded Portable Spectrometer

With the advent of the global commercial era of 5G,spectrum resources,as an important strategic resource,are increasingly valued by countries.With the increase of military or civilian equipment year by year,the contradiction between the demand of radio spectrum resources and the limitation of radio spectrum resources becomes more and more obvious.Some illegal elements illegally use spectrum resources for profit,endangering the state's social security.Therefore,in order to scientifically manage spectrum resources,improve spectrum utilization,crack down on illegal activities and improve spectrum monitoring capability,the importance is self-evident.At the same time,the trend of intelligent and miniaturization of electronic equipment has been formed,which puts forward higher requirements for the performance and integration of electronic equipment.Therefore,it is of great significance to design and develop portable spectrum monitoring and analysis equipment.In view of the above problems,this paper carries out a research on the system design of the portable spectrum analyzer based on the embedded on-chip system platform,including the theoretical basis of spectrum analysis,the overall design of the whole system,the functional realization of the spectrum analysis software and the final test and verification.The specific work of this paper is as follows:For the overall design of the spectrum analyzer system,the advantages and disadvantages of the superheterodyne receiver architecture and the zero if receiver architecture were compared from the perspective of functional requirements,and the hardware structure of the system was designed based on Zynq embedded platform and AD9371 RF transceiver.Based on the design requirements of this paper,the construction of Zynq embedded Linux development environment is realized.At the same time,ADI company provides Libiio library programming design to achieve the AD9371 configuration.In this paper,the spectrum monitoring and analysis work is studied theoretically,with emphasis on various time-frequency analysis methods and demodulation methods of common digital signals.The correctness of the method is verified by matlab simulation,which lays a theoretical foundation for the function realization in subsequent projects.The design and realization of the graphic application software of the spectrometer are completed.In this paper,QT platform is used to write the application software,mainly introduces the modular software design including signal processing module,graphics display module,data storage module,data communication module.The application software realizes the real-time display of time-frequency image and waterfall diagram,the network communication between the upper computer and the underlying hardware,signal demodulation analysis,data storage and reading and other functions.Multithreading is also used to speed up the running efficiency of the software.Finally,this paper tests and verifies the function of the whole system,which guarantees the correctness and reliability of the basic function of the system.