SATLOC – state of the art

George Barbu – Union Internationale des Chemins de Fer

Satellite based operation and management of local low traffic lines

The essential questions for signaling:

Where is my train?Which speed?Which time?

ETCS principle: balise-referenced position

EGNOS and the future GALILEO are civil systems, operated by civilians andunder civil political control. They are designed specifically for civil use andsatisfy requirements that emerged from consultations with many different usergroups. Railways have included their requirements in the HLD - MRD

Results after tests in the railway environment

• Accuracy: 4-6 m; <1m with augmentation; 2-5 cm with RTK or LRK techniques

• Coverage: total is possible with sensors, but accuracy degrades on long dark zones

• Integrity: 2,5.10^-7, but in railways this maybe not always sufficient for the highest integrity applications

• Perror<10^-9 is possible with additional sensors (e.g. Route Map)

• Aim: proof of evidence that GNSS based absolute train location and speed determination is compliant with requirements for signaling and with train control functions (ETCS)

• Objectives:– Live demonstration on LTL of train control, full speed supervision,

traffic control and traffic management based on GNSS – concrete technical solution based on industry supply

– Proof of feasibility of using carrier independent communication (use of public networks @ marginal cost)

– Full specifications of Concept, ORS, FRS, ARS, SRS and methodology for validation and certification

– Reference methodology for performance and safety (until SIL4) assessment of GNSS based absolute positioning

– Economic evaluation, proof of concept export on any railway line– Migration strategy to ETCS: GNSS-based train end localization (train

integrity) level 3 with full interoperability with ERTMS Regional

Aim and objectives

High innovation – close loop controlAccreditation of innovatation change of mentality

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PVT (n) Expected (x;y) at n+1

PVT(n+1)

Matches (ἐ) xy(n+1)

ContinueAssessed

Route map data

Non-assessed

Wait α cyclesExceed αwarning

Active MAL XY

Calculate dynamic speed profile and SBIP, then EBIP

Train data

Matches calculated

data

Train PVT (n)

assessed

Route map static line profile

continue

Warning then EB order

Train and TCC control reciprocally- Train sends each 5 s PVT- TCC real time emulates the train run

under the MA data- Train OBC executes the MA- If MA execution fails, TCC sends EB

High operational safety is enabled by this reciprocal control when both OBC and TCC are qualified at minimum SIL 2

Advantage: low cost on highest operational safety

SATLOC reference architecture

DMITIU

GNSS odometryKERNEL

RADIO INTERFACE (EURORADIO)RFID position

check onboard

RBC + traffic control centerTCC-RBC

Euroradio

Traffic controller interface

Simplified interlocking / LC

TCC-RBC

RFID Tags

EDOR Data:VPN over UMTS (3G..)

Voice CAB radio 3G…

Route map

Route map

Brake & traction

Trackside

Results @ date

• All specifications are concluded – available on the UIC SATLOC extranet and on the EC/GSA project site

• Technical design of the pilot line is ended• Three equipment sets are completely provided• Software products are validated• Two running trains are fully equipped

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Results @ date

• Test specifications are elaborated and agreed with the user and the CFR Safety Authority and Notified Body – full flexibility for safe adapted use is available

• TCC (RBC) center in Zarnesti is operational• The train – TCC mobile data and voice connections are operational:

- Via VPN-Secured link for data transmission in GPRS 3G / 4G coverage is also available (full IP, VPN based on the SEC-IP-VPN protocols in the VODAFONE Network – second provider OTENET is prepared for full availability)

- - Voice over other channels (normal 3G/4G) in a different VPN for secure availability of transmission

• Real scale tests with running trains have successfully ended• Validation, certification and commissioning are ongoing

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TCC operational equipment

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Route map – place of virtual balises – equipment with spring switches – example

stations Rasnov and Cristian

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Successful introduction of the new technology in the railway safety needs accreditation of new mode of thinking, demonstration of operational safety, innovation, convincing demonstration of concept and lifting of technical and mentality barriers.

You are welcome to SEE that it works