Advanced Train Location Simulator (ATLAS) for developing, testing and validating on-board railway location systems

Goya, Jon; Zamora-Cadenas, Leticia; Arrizabalaga, Saioa; Brazalez, Alfonso; Meléndez, Juan; Mendizábal, Jaizki

doi:10.1007/s12544-015-0173-5

Cited by 10 publications

(5 citation statements)

References 26 publications

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“…The exact location of a HST can be detected by track circuits, such as Eurobalises that use the magnetic transponding technology [44]. The location information can then be disseminated to all base stations by using various communications technologies, such as global system for mobile communications in railway (GSM-R), universal mobile telecommunications system (UMTS), or satellite [45]. Assuming that the train's location is sent to a source base station at time t, the time that the control message carrying the train's location reaches the source base station is t + t trans + t prop , where t trans and t prop are the transmission and propagation delays for the control message, respectively.…”

Section: Resultsmentioning

confidence: 99%

On Divergence-Angle Efficiency of a Laser Beam in Free-Space Optical Communications for High-Speed Trains

Kaymak

Rojas‐Cessa

Feng

et al. 2017

IEEE Trans. Veh. Technol.

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In this paper, we propose an adaptive beam that adapts its divergence angle according to the receiver aperture diameter and the communication distance to improve the received power and ease the alignment between the communicating optical transceivers in a free-space optical communications (FSOC) system for high-speed trains (HSTs). We compare the received power, signal-to-noise ratio, bit error rate, and the maximum communication distance of the proposed adaptive beam with a beam that uses a fixed divergence angle of 1 mrad. The proposed adaptive beam yields a higher received power with an increase of 33 dB in average over the fixed-divergence beam under varying visibility conditions and distance. Moreover, the proposed adaptive divergence angle extends the communication distance of a FSOC system for HSTs to about three times under different visibility conditions as compared to a fixed divergence beam. We also propose a new ground transceiver placement that places the ground transceivers of a FSOC system for HSTs on gantries placed above the train passage instead of placing them next to track. The proposed transceiver placement provides a received-power increase of 3.8 dB in average over the conventional placement of ground-station transceivers next to the track. Index Termsfree-space optical communications, optical wireless communications, high-speed trains, beam divergence, adaptive divergence angle.

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Section: Resultsmentioning

confidence: 99%

On Divergence-Angle Efficiency of a Laser Beam in Free-Space Optical Communications for High-Speed Trains

Kaymak

Rojas‐Cessa

Feng

et al. 2017

IEEE Trans. Veh. Technol.

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“…Therefore, it is of high importance to identify challenges, potential factors, and effects of uncertainties which impact the location accuracy. In the following, five key elements which contribute to a vehicle's position error, including sensor hardware, environment, information sources, and positioning estimators, are explained [125,126].…”

Section: Uncertainty In Railway Localisation Performancementioning

confidence: 99%

A Review on Technologies for Localisation and Navigation in Autonomous Railway Maintenance Systems

Rahimi

Liu

Durazo-Cardenas

et al. 2022

Sensors

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Smart maintenance is essential to achieving a safe and reliable railway, but traditional maintenance deployment is costly and heavily human-involved. Ineffective job execution or failure in preventive maintenance can lead to railway service disruption and unsafe operations. The deployment of robotic and autonomous systems was proposed to conduct these maintenance tasks with higher accuracy and reliability. In order for these systems to be capable of detecting rail flaws along millions of mileages they must register their location with higher accuracy. A prerequisite of an autonomous vehicle is its possessing a high degree of accuracy in terms of its positional awareness. This paper first reviews the importance and demands of preventive maintenance in railway networks and the related techniques. Furthermore, this paper investigates the strategies, techniques, architecture, and references used by different systems to resolve the location along the railway network. Additionally, this paper discusses the advantages and applicability of on-board-based and infrastructure-based sensing, respectively. Finally, this paper analyses the uncertainties which contribute to a vehicle’s position error and influence on positioning accuracy and reliability with corresponding technique solutions. This study therefore provides an overall direction for the development of further autonomous track-based system designs and methods to deal with the challenges faced in the railway network.

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“…The use of on-board satellite positioning systems in the projects listed is mainly focused on the objective of having a positioning solution suitable for Virtual Balise (VB) [26].The positioning solutions used to provide the VB usually generate a continuous Position, Velocity and Time (PVT) estimate. However, the VB solution requires only areas where the VB can be triggered and therefore only a spot positioning system is required.…”

Section: System (Lds) the Lds Is A Fusion Of Gnss Systems Withmentioning

confidence: 99%

Map-Aided Software Enhancement for Autonomous GNSS Complementary Positioning System for Railway

Miguel

Goya

Fernández

et al. 2019

IEEE Trans. Veh. Technol.

Self Cite

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Independently on the business case addressed, one of the main drawbacks of the railway use cases that need continuous Global Navigation Satellite Systems data is the lack of availability for the 100% of the time of the journey. Additionally, the integrity assessment of the position estimation given is also mandatory for safety critical applications. Thus, tunnels and multipath effects are one of the most challenging situations for the continuous positioning systems. In this context, an autonomous on-board Complementary Positioning System has been proposed to overcome the limitation of Global Navigation Satellite System based positioning systems. This paper proposes a positioning enhancement solution by means of fusing data from the satellite navigation system and inertial measurement units. That hybrid solution provides higher availability and accuracy to the positioning specially on known blocked scenarios, such as tunnels, or urban canyons, by means of a novel environment aware map aided software technique named Known Blocked Scenarios algorithm … This paper describes the Complementary Positioning System and the field test carried out in a challenging environment to validate the enhancement proposed by the authors, which demonstrate the benefits that this system has in known harsh environments for railways.

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Advanced Train Location Simulator (ATLAS) for developing, testing and validating on-board railway location systems

Cited by 10 publications

References 26 publications

On Divergence-Angle Efficiency of a Laser Beam in Free-Space Optical Communications for High-Speed Trains

On Divergence-Angle Efficiency of a Laser Beam in Free-Space Optical Communications for High-Speed Trains

A Review on Technologies for Localisation and Navigation in Autonomous Railway Maintenance Systems

Map-Aided Software Enhancement for Autonomous GNSS Complementary Positioning System for Railway

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