Research On Safety Risk Assessment Of LTE-R Communication System

LTE-R communication system is one of the development directions of next generation railway research.As the core of controlling the efficient and safe operation of trains,it must have high security and reliability.The safety assessment of the system is also the most important part of the system life cycle.With the rapid development of high-speed railway,it is very necessary to have a good set of safety assessment programs and standards.Therefore,this paper proposes a set of security risk assessment scheme for lte-r communication system,which can provide reference and reference for the research and development improvement and assessment of the system.In this thesis,LTE-R communication system is taken as the research object.On the basis of the existing research literature,Aiming at the wide concept and fuzziness of its safety index system in the existing research literature,a more detailed index system is proposed and its rationality is verified.In view of the characteristics of the existing literature evaluation scheme that is too subjective and purely based on experience,an evaluation scheme based on subjective and objective weight combination is proposed.In view of the shortcomings of many kinds of combined weighting methods and different coefficients,this thesis puts forward a variety of methods to compare and analyze the results.According to the characteristics of single comprehensive evaluation results in the existing literature,this thesis proposes a scheme of radar map and cloud model for evaluation,which is evaluated and analyzed from the whole and details respectively.Firstly,the research background and significance of the subject are clarified,Based on the understanding of the basic theoretical knowledge of LTE-R system,the risk analysis of LTE-R system is carried out and the hierarchical holographic model of the system is constructed.According to the grade holographic model,the evaluation index system is established.Through consulting experts and relevant engineering technicians,statistical theory is introduced to analyze the reliability and effectiveness of the index system construction,so as to make changes and adjustments and establish the final index evaluation system.Secondly,Using FAHP and CRITIC to calculate the weight of the index,and use two classical combination methods of linear weighted combination method and multiplication synthesis method to calculate the subjective and objective weight synthetically.Considering that the different subjective and objective coefficients of the linear weighted combination method will directly affect the results of the comprehensive weight,multiple coefficients are compared.At the same time,the subjective and objective weights and the comprehensive weights are compared and analyzed in the form of charts,so as to identify the deviation of the final evaluation results.Finally,in order to better describe the security level of the system,this thesis uses the improved radar map method and cloud model to evaluate.Combining the synthetic weight with the radar image,the paper presents the advantages and disadvantages of the index from the macro and micro aspects and puts forward the improvement and optimization suggestions.The standard evaluation cloud model and the comprehensive evaluation cloud model are constructed,and the two cloud models are cross compared,at the same time,the similarity of the cloud model is measured.The results show that the system security level is excellent,and the system security assessment process can effectively describe the system security capability.This study can provide ideas for the subsequent development of LTE-R system security assessment process.