Research of observables adapted to the analysis of em noise impacting the quality of GSM-Railway transmissions

The GSM-R (Global System for Mobile communications-Railways) is a communication system under deployment in Europe to transmit voice exchanges and data signalling information between the trains and the control centres. This system consists in a network of Base Transceiver Stations (BTS) located on the track side and the trains are equipped with an antenna on the locomotive connected to an embedded mobile. The GSM-R antenna receives the signals sent by the BTS but can also receive in-band electromagnetic (EM) interferences present above the train. These interferences have therefore to be controlled to verify that their levels do not affect the quality of the GSM-R reception. This paper is focused on the research of observables and measurement methods efficient to control the EM disturbances produced on board the trains, in order to warrant the protection of the GSM-R communications. © 2012 IEEE

Test bench for the evaluation of GSM-R operation in the presence of electric arc interference

The transient electromagnetic field emissions from the pantograph electric arc captured by a GSM-R antenna mounted on roof top were recorded and used to reproduce the disturbance on a test bench for the evaluation of the Quality of Service under controlled conditions. The arrangement of the test setup and the characteristics of used equipment are presented. The parameters that characterize the noise coupled onto the GSM-R channel are put in relationship with QoS indexes. Finally, the results obtained from preliminary tests are reported. © 2012 IEEE

Statistical characterisation of the EM interferences acting on GSM-R antennas fixed above moving trains

International audienceIn order to harmonise the communication systems between the train and the railway control centres over the European territory, a GSM-R (Global System for Mobile communications – Railways) communication network is progressively deployed along the European railway network. However, the GSM-R communications on board high speed trains can be disturbed by the transient electromagnetic (EM) disturbances induced by the sliding contact between the catenary and the pantograph. In order to study the immunity of the embedded GSM-R communication system against these transient electromagnetic disturbances, the transient interferences induced on the GSM-R antennas on board trains, were characterised in terms of time and amplitude parameters. Measurement campaigns were carried out in France to collect a large number of induced EM interferences on GSM-R antennas fixed on the train roof. With the ultimate goal of generating transient noise scenarios representative of those detected by the antennas, and performing immunity tests in laboratory, statistical distributions of the characteristics (rise time, time duration, repetition rate, amplitude) of the transients are presented. This paper presents the different steps of the analysis of the transient disturbances and the generation of the transient EM scenarios

Communication systems of high‐speed railway: A survey

Modern railway services are required to deliver good quality services to the passenger throughout the whole journey. These include improved performances, safety, and reduce delays. There is also the requirement for in‐train customer experience such as infotainment and access to reliable communication systems. The railway industry has employed different types and generations of communication systems in recent times. Signaling systems were used at the early stage of the railway services. Today, communication systems such as the second‐generation communication system, also known as the global system for mobile communications (GSM), the Third‐generation (3G) and the Fourth‐generation (4G) are utilized in the railway industry. In this paper, we present a brief history of railway communication systems, their features and applications. In addition, we discuss the technical challenges and potential solutions of in‐train communication systems and how data can be distributed on‐board and between the train coaches using state of the art and hybrid communication technologies