Evaluation of the Impact of Transient Disturbances on Railway Signaling Systems Using an Adapted Time-Frequency Analysis Method

Abstract

As many other industrial environments, the railway electromagnetic environment is characterized by a large number of electromagnetic signals and disturbances. Among these, transient signals, with high energy level and wide frequency spectrum, represent an important threat to different signaling subsystems. In this paper, a new methodology dedicated to the detection and the characterization of the transient disturbances is presented. Based on a flexible and adjustable time-frequency analysis, this methodology is used to evaluate the impact of transient disturbances on a ground-to-train radio communication. A test bench was developed in order to validate the results of this evaluation.

EMI and IEMI Impacts on the Radio Communication Network of Electrified Railway Systems: A Critical Review

“…do not specify basic personal safety requirements for apparatus under fault conditions [77], [78] Modeling lumped equivalent circuits and transfer functions like EM topology [83], [84] cannot cover the frequency range, obtain proper transfer functions, and add any new parameters EMI issue from Pantograph-Catenary Arcing (transient disturbance EMI issue) [29], [85], [86] the only model construction for EMI issue and only based on GSM-R communication system Mitigation suppression techniques, including passive filter, Wheatstone bridge balance, active filter, and optimized modulation, related to hardware electrical equipment [87]- [90] unsuitable for the railway domain or the field of telecommunications Detection statistics-based and threshold detection (capture the temporal and spectral information with time and frequency analysis) [91]- [94] cannot analyze multiple indicators and distinguish attacks in real time IEMI classification methods, either binary or multiple classifications [95] efficiency is low and needs a long processing time with a huge amount of data Mitigation increasing transmitted power to increase SIR, switching from the train front antenna to the train rear antenna to increase attenuation, and using a high front-to-back ratio train antenna [73] Mainly physical methods to mitigate the impact and lack consideration about the specific telecommunication field in the railway systems [26], [96] in the above three spaces. Therefore, each disturbance generated in the EM environment interacts with the EMU and ultimately interferes with the OTCS equipment in HSR, as illustrated in Fig.…”

“…enable more advanced services to improve efficiency, safety, reliability, and profit [23]- [25]. However, this evolution leaves new forms of vulnerability to EM disturbances characterizing the railway environment [26]. Generally speaking, radio communications can provide railways with three types of services: safety-related services to support train movement, non-safetyrelated operational services, and internet access by onboard passengers [25].…”

Critical Review of EMC Standards for the Measurement of Radiated Electromagnetic Emissions from Transit Line and Rolling Stock

“…Electrified transportation systems may represent a significant source of radiated electromagnetic emissions with peculiar mechanisms of emissions [1][2][3][4][5][6], considering disturbance to both circuits and services within the right-of-way [7][8][9][10][11][12][13][14][15], and more generally to the "outside world" [16,17]. The intensity of electromagnetic field emissions and equipment exposed, and potentially interfered with may vary depending on the frequency interval.…”

A VMD Based Improved De‐noising of Onboard BTM Receiving Signal

“…The disturbances suffered by BTM include not only harmonic current of traction system, but also transient electromagnetic disturbances such as electromagnetic pulse disturbance generated by traction system and discharge noise generated by pantograph arcing [1,2] . The characteristics of these disturbances would change greatly with the difference of the structure of traction system, the distribution of power cable, the location of circuit breaker, etc.…”