Modeling and Optimization Research for Dynamic Transmission Process of Balise Tele-Powering Signal in High-Speed Railways

Abstract

Abstract-As key components of the train control system, balise and Balise Transmission Module (BTM) cooperate with each other and fulfill the ground-train information transmission to ensure the safety and reliability of train operation. Aiming at the requirements for future developments of high-speed railway, this paper builds the model for the dynamic transmission process of the balise tele-powering signal using finite element method and electromagnetic field theory, respectively. The paper analyzes the change law of the magnetic flux density distribution within the balise receiving antenna, and derives expressions for the balise induced voltage amplitude envelope based on train speed. Then, the paper carries out the performance optimization to the existing balise system from two perspectives of the balise mounting style and the BTM mounting height. Experiments show that the proposed optimization measures can substantially enhance the system's adaptability to the ever-increasing train operation speed from the existing 448 km/h to 523 km/h. Furthermore, a potential optimization scheme with respect to the BTM mounting angle which enables huge promotion of the system performance is also discussed and proposed.

System-Level Fault Prognosis for High-Speed Railway On-Board Systems

“…When the train crosses the Balise, the mutual inductance changes with the relative position Δx of the antenna and Balise, first increasing and then decreasing, so the Balise-induced voltage can divide into the sleeping area and the start area. In Zhao and Jiang ( 34 ), the threshold of the starting Balise-induced voltage is given, and the changing rule of mutual inductance is shown. Here, three positions were chosen to see the effects of the component degradation at the system level:…”

“…Based on the EuroBalise standard 036, the energy carrier signal is 27 MHz (±5%), the inductance of the antenna is 820 nH, and to achieve resonance in the circuit, according to Equation 12, the result is C = 42 . 08 pF . In Ref ( 34 ), according to practical experience, the power of the antenna is P 0 = 13 W , Z = 50 Ω , so when series resonance occurs in the circuit, according to Equation 14,…”

“…In Zhao and Jiang ( 34 ), the mutual inductances of position 1, 2, and 3 are given as M 1 = 0 . 65 nH , M 2 = 3 . 41 nH , and M 3 = 19 . 85 nH , and the threshold of the Balise-induced voltage is given as V = 3 . 3 V . For the sake of simplicity, the specific point was chosen to show the degradation effects on the system level.…”

Metal Effect on Reliability of Balise Transmission System Antennas

“…The balise transmission system is made up by balises installed on railway tracks and on-board Balise Transmission Module (BTM) [6,7].…”

“…The loop antennas of balise transmission system is modelled and studied in perfect conditions (free air space conditions) [6,7]. However, imperfect conditions, such as the dielectric and metal near the system would decrease the effective communication distance.…”