Research And Implementation Of Real-time Network Interference Detection Technology For GSMR System Operation

Interference in communication system will affect the communication quality of communication system,and even cause communication interruption in case of strong interference.This kind of communication connection failure,network switching failure,drop call and other failures caused by interference will affect a series of processes of train dispatching and may cause serious accidents endangering the safety of railway transportation if they occur in the process of GSM-R communication.Therefore,it is urgent to effectively solve this kind of interference problem.The interference should be detected first to detect the existence of interference;in order to eliminate the interference source and suppress the interference signal,it is necessary to locate the interference source and obtain the information of the incoming direction of the interference signal;in order to ensure the normal operation of the communication system,before removing the interference source,the interference must be suppressed first,with the maximum limit The communication is smooth.This paper will study the interference of GSM-R communication system from three aspects:interference detection,interference source location and interference suppression.In order to provide some reference for related research.The first chapter of this paper is the introduction,focusing on the research background,domestic and foreign research trends,the purpose and significance of research content;the second chapter is related concepts,focusing on GSM-R concept,interference source classification(co frequency interference,adjacent frequency interference,intermodulation interference)GSM-R system interference detection technology,real-time spectrum analyzer in railway GSM-R network detection application;the third chapter of this paper This chapter is the analysis of GSM-R system network interference detection requirements,mainly introduces the GSM-R system network interference status analysis,different interference and the impact on GSM-R system(co channel interference on GSM-R service,adjacent frequency interference on GSM-R service,blocking interference and impact on GSM-R system,repeaterinterference and impact on GSM-R System);the fourth chapter is GSM-R communication system interference detection positioning and suppression method design,focusing on the GSM-R communication system interference traditional detection methods,interference detection algorithm optimization(based on traffic statistics interference detection optimization,based on road test interference detection optimization)interference source location algorithm optimization design,interference suppression algorithm optimization;the fifth chapter is the simulation test,mainly introduces the interference source localization algorithm simulation Simulation verification of true and suppression algorithm,measurement and analysis of interference sources(test points with external GSM interference signal during electromagnetic environment test,test point with unknown sudden and continuous interference signal during electromagnetic environment test,test point with public network large signal lifting GSM-R downlink frequency band during operation,test point with public network large signal lifting GSM-R uplink band during operation,and operation of test point with external GSM interference signal during electromagnetic environment test During this period,there are test points of GSM-R frequency spurious signals transmitted by public network base stations,intermodulation interference test points during operation,and blocking interference test points during operation);the sixth chapter is the conclusion and prospect part.