Research on Electromagnetic Interference Coupling Law of BTM Antenna on EMU

In the process of signal transmission between ground-fixed balise and vehicle-mounted BTM antenna, it is easily exposed to electromagnetic interference, among which transient pulse interference is the most frequent and serious one. Therefore, it is of great significance to carry out the research on the electromagnetic interference coupling law of onboard BTM antenna and master its interference coupling characteristics for ensuring the normal transmission of train signal. In this paper, firstly, based on the working principle and transmission characteristics of balise system, the simulation modeling of vehicle-mounted BTM antenna is analyzed. Then, the time domain, frequency domain and energy distribution of typical pulse jamming signals are analyzed. Based on the model of vehicle-mounted BTM antenna, the coupling current of vehicle BTM antenna port under the influence of different types, different polarization angles and different incident angles is simulated. The results show that when the pulse interference signal is horizontally polarized, the electromagnetic interference caused to the vehicle-mounted BTM antenna is much greater than that caused by the vertical polarization, and when the incident direction is in the main lobe direction of the vehicle-mounted BTM antenna, the influence on the vehicle-mounted BTM antenna is the largest.