Research On Electromagnetic Pulse Interference Of High-speed Railway Train Control System Based On Field-Circuit Cooperated Simulation

There are multiple antennas and highly integrated electronic equipment in the high-speed train operation control system.The electromagnetic sensitivity is high,and it is susceptible to electromagnetic pulse interference,which may endanger driving safety in severe cases.In recent years,train operation failures caused by electromagnetic pulse interference have occurred from time to time.Research on the electromagnetic pulse coupling method of train control systems and vulnerable links to protect driving safety has become a focus of research and business circles.Based on the practical task of the Hebei Province Key Laboratory of Electromagnetic Environmental Effects and Information Processing,this paper studies the interference of electromagnetic pulses on vehicle train control systems.The main work is as follows:(1)Analysis of weak link of electromagnetic pulse coupling in vehicle train control systemUsing the actual electromagnetic interference data in recent years,the weak points of the vulnerable coupling of the electromagnetic pulse coupling of the vehicle train control system were evaluated by the expert scoring method.In order to better reflect the causal relationship between electromagnetic interference factors,a graphical model of electromagnetic topology was constructed through Bayesian network,and the system was evaluated from the perspective of probability.Expert evaluation method and Bayesian networks complement each other,and the conclusions are the same.The balise system is a weak link that is easily damaged by the electromagnetic pulse coupling in the vehicle train control system.(2)Modeling and simulation of field-circuit cooperative high-speed rail balise systemIn order to carry out a more accurate research on the electromagnetic interference problem of the external environment of the balise system,the field-circuit co-simulation method is used to model and simulate the complete electromagnetic field-circuit signal transmission model.The transmission performance is verified by the antenna parameters,and the demodulation circuit is verified by Gaussian noise,the relationship between antenna distance and system bit error rate is simulated to verify the system-level simulation model.The system-level simulation model of the balise established in this chapter complies with the relevant railway standards and is consistent with the actual working scenario,laying the foundation for the electromagnetic simulation calculation in the next chapter.(3)Simulation analysis of system-level coupling effect of electromagnetic pulseThe simulation of the system-level coupling effect of a typical electromagnetic pulse on the balise system model is studied.Through different types of pulse interference simulations,it can be seen that lightning has the greatest impact on system transmission.Based on the simulation of multi-pulse interference and continuous pulse interference at equal intervals,the cause of the message drop accident,the relationship between the number of pulses and the system bit error rate were studied,and the system's susceptibility criterion were obtained through regression analysis.Lay the foundation for in-depth research on electromagnetic interference.