Travelling Virtual Balise for ETCS

a. filip

Outline

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Open Access

Research article

Travelling Virtual Balise for ETCS

a. filip

Faculty of Electrical Engineering and Informatics, University of Pardubice, Czech Republic

International Journal of Transport Development and Integration

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Volume 1, Issue 3, 2017

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Pages 578-588

https://doi.org/10.2495/TDI-V1-N3-578-588

Received: N/A,

Revised: N/A,

Accepted: N/A,

Available online: N/A

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Abstract:

The railway industry has taken a great effort and is currently focused on exploitation of global navigation satellite system (GNSS) for the European train control system (ETCS). It has been assessed that replacement of track balises, used for safe train location determination, with virtual balises (VBs) detected by means of GNSS will significantly reduce the track-side infrastructure and operational costs. However, this innovated ETCS can be put into operations only in the case when detection of VBs by means of GNSS will achieve the same safety integrity level (SIL 4) and availability as it is required for physical balise groups (BGs).

This paper describes a novel travelling virtual balise (TVB) concept, which was proposed to meet the demanding ETCS safety requirements for GNSS using the existing European Geostationary Navigation Overlay Service (EGNOS) safety-of-life (SoL) service. The TVB concept profits from the basic feature of GNSS – i.e. the ability of abundant train position determination in GNSS service volume, which cannot be realized by current track balise groups (BGs) with a spacing of hundreds of metres or more. The frequent GNSS train positions are utilized for (1) fast diagnostics of on-board location determination system (LDS), (2) introduction of reactive fail-safety into LDS and (3) derivation and justification of the ETCS safety requirements for EGNOS.

The TVB concept brings one significant advantage to ETCS in contrast to the static VBs – i.e. the safety requirement for LDS doesn’t depend longer on the distance between successive VBs. It means that the existing spacing between physical BGs (up to 2.5 km) can be also preserved in case of TVBs. It can significantly improve the availability of LDS. Further it was found that a less demanding tolerable hazard rate (THR) requirement for GNSS of about 1e-7/1 h or more still enables to meet the ETCS THR requirement for VB determination, i.e. THR_VBof 0.67e-9/1 h. Thus the ETCS TVB concept opens the door for efficient use of the EGNOS SoL service, originally developed for aviation.

Keywords: EGNOS, ETCS, Galileo, GPS, High-safety integrity, LDS, railway signalling, Reactive Fail-safety, Safety-related systems, SIL 4

1. Motivation

2. Physical and Virtual Balises for Train Position Reporting

3. Safety Requirements for Virtual Balise and LDS

4. Single- Versus Multi-constellation Egnos for LDS

5. From Static to Travelling Virtual Balise

6. Conclusion

Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

Acknowledgments

This work was supported from the European H2020 research and innovation programme within the RHINOS project (2016–2017).

Conflicts of Interest

The authors declare that they have no conflicts of interest.

References

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Filip, A. (2017). Travelling Virtual Balise for ETCS. Int. J. Transp. Dev. Integr., 1(3), 578-588. https://doi.org/10.2495/TDI-V1-N3-578-588