European GNSS-Rail User Workshop_2012.pdf

European GNSS-Rail GNSS Rail User Workshop
European GNSS Agency

Introduction - GSA
London Waterloo Station, Sunrise 2 December 2012

Overview of GNSS
3

Anticipated evolution of GNSS receivers

European GNSS services – partners to GPS
Global Navigation Satellite System
Under full European, civilian control
IOC due in 2014
FOC in 2019
Constellation of 27 satellites
4 satellites already in orbit
Satellite Based Augmentation System
Provides corrections and integrity to GPS
EGNOS in Europe, WAAS in US
Open Service since October 2009
Safety of Life service since March 2011
European coverage, under extension in other regions

Galileo services
• Early OS, SAR, PRS services will be provided by
2014/2016
Open Service
Public Regulated
Service
Search and Rescue
Service
Commercial Service
Safety of Life Service
Free to air, mass market,
simple positioning
Encrypted, robust,
continuous availability
Near real-time, precise,
return link
Encrypted, high accuracy,
added-value service
Adds integrity to
open service

How today’s GNSS devices are ready for
the future
% of GNSS receiver products
available on the market today
Source – GPS World Receiver survey (2012)

GNSS in Rail
8

The Broad Spectrum of Train Location
Applications
9

Case study: Low Density Line Signalling
Existing trackside signalling equipment is very
costly to install and maintain
Provide train location using GNSS
supplemented by other means including
Inertial Navigation Systems
Map-matching
Odometry
Methods for specific situations
Offers significant cost savings as well as
allowing low density/rural lines to remain
open
10

Case study: ERTMS Level 3
• GNSS could have a significant role to play in
providing absolute rather than relative
positioning
• GNSS requirements for ERTMS Level 3 need
to be defined fully
• A robust GNSS-based train location system is
needed to offer improvements
– The rail sector needs to state its requirements
• Offers potential to
– Reduce the number of balises, and therefore costs
– Increase network capacity, and therefore revenue
11

Case study: Asset Management
• An example of a non-safety critical function
• Improved Asset Management helps reduce costs for
– Infrastructure owners by monitoring track status and use
– Operators by improved knowledge of train movements and
maintenance status
• The companies who invest in the technology will also
see the benefits in the management of their fleets
• This application can include a number of functions
– Fleet Management
– Infrastructure Charges
– Delay Attribution
– Inter-modal Transfers
12

Interactive Session 1
13

• What is preventing GNSS based train
positioning solutions?
Key questions
• How should rail exploit emerging GNSS
capabilities?
– What are the applications that would most benefit from train
location in the near term?
– How close is GNSS to supporting Low Density Lines?
– To what extent does your organisation use GNSS?
– How are you planning to use GNSS in the near future?
– What do you see as the main barriers for your organisation,
in implementing GNSS?
– What are the prospects for ERTMS?
14

Break
Image: Network Rail
Signal collapsed due to flooding, 27 November 2012
15

EGNOS in Rail
16

What is EGNOS ?
• European Geostationary Navigation Overlay
Service (EGNOS)
• EGNOS improves the
accuracy of position
measurements by sending
out signals that correct GPS
data and provides
information on its reliability
• EGNOS open signal is free
and has been officially
launched on
1st October 2009
• EGNOS was certified for
aviation in March 2011

Accuracy improvement thanks to EGNOS
Error type GPS EGNOS
Orbit and clock synchronisation 1 m 0,5 m
Tropospheric error 0,25 m 0,25 m
Ionospheric error 2 m 0,3 m
Receiver noise 0,5 m 0,5 m
Multipath 0,2 m 0,2 m
UERE (quadratic sum of errors - 1 σ) 2,31 m 0,83 m
HDOP (function of geometry of visible satellites) 1,1 1,1
Horizontal positioning accuracy error
(1 σ) = UERE x HDOP 2,54 m 0,92 m
Horizontal positioning accuracy error (2 σ, 95 %) 5,08 m 1,84 m
Source : CNES’ User guide for EGNOS application developers
Note: Typical orders of magnitude are shown, with actual results depending on the conditions encountered
18

EGNOS Services – for the next 20 years
Service Characteristics Service Status
Open Service accuracy ~1m, free available since October
2009
Safety of Life Service accuracy ~1m,
compliant to aviation
standards
Commercial Service
(EDAS)
accuracy

• Why should rail consider EGNOS?
EGNOS and Rail
• Operational since 2009 and stable performance for
many more years
• Interoperability with other SBAS (e.g. the US
WAAS) adds export value
• Most receivers are already SBAS capable and at no
extra cost
• EGNOS already widely used in consumer and
professional markets
• Integrity of key value
• Does this meet your requirements?
• EGNOS next generation will be frozen at end 2012!

Interactive Session 2
21

An Ideal GNSS receiver to support
most rail applications?
• Ability to upgrade to multi-constellation, multi-frequency
frequency GNSS (GPS, Galileo and GLONASS)
• Integrated with INS or on-board odometer to provide necessary
service continuity
• Potential to support multi-GNSS integrity in the future
• Assistance data via WiFi/GSM-R for cold starts (e.g. in depot)
• Equipment lifetime at least 10 years
• Open standards for antenna input
and PVT output to support multiple
applications
• Integrated with on-board map/
rail network model
• …and all at COTS prices

What would be most beneficial to your
business?
Funds for
Application
Development
Standardisation

Summary - GSA
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Vision of EGNSS potential in European Rail
Sector
Three main application areas foreseen where GNSS could help:
Asset management and supply chain
better visibility of rail assets
solutions for better transparency in the supply chain
helping to promote rail as a reliable mode of goods
transport
Low Density Lines
back-up or enhancement of current systems
a cost efficient solution for signalling and train
control helping to maintain competitiveness of LDL
Main lines
back-up or enhancement of current systems
support implementation of ERTMS with additional
position/speed information provided by EGNSS

The purpose of EGNSS in Rail WG is to:
• address barriers for EGNSS implementation
EGNSS in Rail User group
• influence GSA strategy to meet rail sector needs
• members of the group will have access to GSA market modelling
results and other research materials on EGNSS in rail
• provide requirements on EGNSS
Bi-annual EGNSS in Rail WG meetings
26

EGNSS in Rail UG – potential participants
– Infrastructure Managers
– Train operators
– Safety authorities
– Train signalling equipment suppliers
– GNSS equipment suppliers
27

EGNSS in Rail WG – organisation/next
steps
The GSA will:
•Distribute minutes from this kick-off workshop to all
participants
•Explore the possibilities to manage a meeting on the back
of next year´s major Rail events
•Setup the WG and hold 1 st meeting during following six
moths
Registration for participation on the EGNSS in Rail WG – if
you are interested to participate, please send your
requests to gavin.fourie@askhelios.com – Subject: EGNSS
in Rail WG.
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Thank you for your attention
European GNSS Agency