Design Of Distributed Software Radio Signal Detection And Separation System

With the development of radio technology and the wide application of communication technology,the situation of radio interference is becoming more and more serious,which disturbs the normal broadcasting order and occupies a large number of frequency resources.Therefore,it is particularly important to monitor the radio and protect its frequency resources.Combined with the new technology and experimental research project of co-channel signal interference detection in radio signal monitoring of Gansu radio monitoring station,the software system of programmable hardware platform,GPS clock synchronization multi-coprocessor,mixed signal separation algorithm and controllable hardware is emphatically studied,and a distributed software radio signal detection and separation system is designed.The main work of this paper is as follows:Firstly,the working principles of RF transceiver module,digital-to-analog conversion module and frequency mixing module are analyzed,and the circuit diagrams of each module and PCB circuit diagram of hardware platform are drawn.Combined with the distributed architecture formed by directional array antenna and GPS clock synchronization multi-coprocessor,a distributed hardware platform is designed to realize signal broadband acquisition and signal gain acquisition.Then,aiming at the influence of redundancy between radio signals on signal separation,PCA-EFICA algorithm is proposed to remove redundancy between signals.The PCA-EFICA algorithm is simulated and tested,and the performance of PCA-EFICA algorithm is analyzed according to the evaluation index of separation algorithm and compared with EFICA algorithm.Using software radio technology,the signal detection and separation system is modularized,and a comprehensive radio management platform system with complete functions and simple operation is designed in combination with the actual requirements of visual monitoring,site visual management,data statistics and total site control in the project.Finally,the distributed software radio signal detection and separation system is tested.The monitoring station of Hezuo City and Tiantang Temple in Wuwei City were selected as the actual test sites,and the radio signals of the same frequency band were separated and their signal strength and waterfall map were displayed,and then the statistical information of channel occupancy,frequency band occupancy and frequency band scanning data were generated,which provided a set of field measurement system with the same frequency signal detection and separation for radio monitoring stations.