D5.3 EGNSS Target Performances to meet railway safety requirements Project acronym: STARS Project full title: Satellite Technology for Advanced Railway Signalling EC Contract No.: (H2020) 687414 Version of the document: 07 Protocol code: STR-WP5-D-ANS-034-06 Responsible partner: ANSALDO Reviewing status: ISSUED Delivery date: 30/04/17 Dissemination level: PUBLIC This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 687414 SATELLITE TECHNOLOGY FOR ADVANCED RAILWAY SIGNALLING CHANGE RECORDS Version Date Changes Authors B. Brunetti (ANSALDO STS), N. Kassabian (ANSALDO STS), Salvatore Sabina (ANSALDO STS), Fabio Poli (ANSALDO STS), Alfio Beccaria 1 23.02.2017 First draft, including chapters 1 to 5 (ANSALDO STS), Andrea Carbone (ANSALDO STS), Iban Lopetegi (CAF I+D), Tahir- Ali Klaiq (BT), Stamm Bernhard (SIE), Jean Poumailloux (TAS- F) , Marc Gandara (TAS-F) B. Brunetti (ANSALDO STS), N. Kassabian (ANSALDO STS), Salvatore Sabina 2 10.04.2017 Second draft, including chapters 6 to 7 (ANSALDO STS), Fabio Poli (ANSALDO STS), Iban Lopetegi (CAF I+D), Tahir-Ali Klaiq (BT) B. Brunetti (ANSALDO STS), N. Kassabian (ANSALDO STS), Final revision, taking into account comments 3 18.04.2017 Salvatore Sabina (ANSALDO received STS), Jean Poumailloux (TAS- F) B. Brunetti (ANSALDO STS), N. Kassabian (ANSALDO STS), Salvatore Sabina (ANSALDO STS), Jean Poumailloux (TAS- F), I. Lopetegi (CAF I+D), Tahir- Final revision, taking into account the additional Ali Klaiq (BT), J. Marais comments received and the results of the 4 28.04.2017 (IFSTTAR), J. Beugin phone conferences aimed at discussing such (IFSTTAR), S. Besure (ALS), I. comments. Puncochar (ZCU), O. Straka (ZCU), V.J. Giner Herrera (INECO), P. Kacmarik (AZD),K. Vesely (AZD), F. Rodriguez (TPZ) B. Brunetti (ANSALDO STS), Final revision, taking into account latest N. Kassabian (ANSALDO STS), 5 28.06.2017 comments from AZD and pending comments for Salvatore Sabina (ANSALDO SIE STS), K. Vesely (AZD) Revision taking into account comments and B. Brunetti (ANSALDO STS), proposed changes of GSA reviewer stated in N. Kassabian (ANSALDO STS), 6 05.07.2017 STARS review sheet dated 03-07-2017 revision Salvatore Sabina (ANSALDO 01. STS) 7 07.07.2017 Final version after TMT approval A. Toma (DAPP) STR-WP5-D-ANS-034-06 Page 2 of 104 SATELLITE TECHNOLOGY FOR ADVANCED RAILWAY SIGNALLING TABLE OF CONTENTS CHANGE RECORDS ...................................................................................................................... 2 1 INTRODUCTION ...................................................................................................................... 6 1.1 Executive summary .......................................................................................................... 6 1.2 Definitions and acronyms ................................................................................................. 7 2 REQUIREMENTS IN ERTMS/ETCS ON TRAIN POSITIONING ............................................ 11 2.1 Functional Requirements ............................................................................................... 11 2.1.1 General description ..................................................................................................................... 11 2.1.2 Track selectivity .......................................................................................................................... 12 2.1.3 Position of train against speed and other infrastructure limitations as well as signal locations . 12 2.1.4 Train orientation .......................................................................................................................... 12 2.1.5 Train direction of movement ....................................................................................................... 13 2.1.6 Absolute position of Train in reference to a grid model .............................................................. 13 2.2 Current Solutions in ERTMS/ETCS ................................................................................ 13 2.2.1 Track selectivity .......................................................................................................................... 13 2.2.2 Longitudinal position of train along track .................................................................................... 13 2.2.3 Train orientation with respect to track ......................................................................................... 14 2.2.4 Direction of train movement along the track ............................................................................... 15 2.3 Existing Performance and Safety Requirements ............................................................ 15 2.3.1 Track selectivity .......................................................................................................................... 15 2.3.2 Longitudinal position of train along track .................................................................................... 15 2.3.3 Train orientation with respect to track ......................................................................................... 16 2.3.4 Direction of train movement along the track ............................................................................... 16 2.3.5 Missing a balise .......................................................................................................................... 16 2.3.6 Erroneous reporting of a balise................................................................................................... 16 3 CHALLENGES OF USING GNSS IN ERTMS/ETCS ............................................................. 17 3.1 Availability ...................................................................................................................... 17 3.1.1 Availability impacts resulting from MTBF .................................................................................... 17 3.1.2 Availability impacts resulting from spurious errors ..................................................................... 17 3.2 Safety ............................................................................................................................ 17 3.3 Lack of absolute position ................................................................................................ 17 3.4 Different coordinate systems .......................................................................................... 17 3.5 Open Standard / Interoperability Requirement ............................................................... 18 3.6 Performance Impact due to Environmental Impacts ....................................................... 18 3.7 Management of known Gaps in GNSS Coverage .......................................................... 18 4 EXISTING SYSTEMS ............................................................................................................ 19 4.1 ERTMS/ETCS ................................................................................................................ 19 4.1.1 Trackside subsystem .................................................................................................................. 20 STR-WP5-D-ANS-034-06 Page 3 of 104 SATELLITE TECHNOLOGY FOR ADVANCED RAILWAY SIGNALLING 4.1.1.1 Balise ...................................................................................................................................... 21 4.1.1.2 Trackside radio communication network (GSM-R) ................................................................ 21 4.1.1.3 RBC ........................................................................................................................................ 21 4.1.2 On-board subsystem .................................................................................................................. 21 4.1.2.1 Onboard radio communication system (GSM-R) ................................................................... 21 4.1.3 Architecture of the positioning function in ETCS ........................................................................ 21 4.2 SBAS ............................................................................................................................. 23 4.2.1 EGNOS mission overview .......................................................................................................... 23 4.2.2 EGNOS system overview ........................................................................................................... 23 4.2.3 Considerations regarding EGNOS usage in railway domain ...................................................... 25 5 REFERENCE ARCHITECTURE FOR USING GNSS IN ERTMS/ETCS ................................ 29 5.1 Virtual Balise Concept .................................................................................................... 29 5.2 Possible implementation of architectures to use GNSS/SBAS in ERTMS/ETCS based on Virtual Balise .............................................................................................................................. 29 5.3 Local environmental conditions ...................................................................................... 33 5.4 Resulting Architecture .................................................................................................... 34 5.5 System Boundaries ........................................................................................................ 36 5.6 Performance