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The Transition from ESTB to EGNOS: Managing User Expectation
Dr Sally Basker, Helios Technology Ltd
Mr Giorgio Solari, ESA GISS, Belgium
Dr Javier Ventura-Traveset, ESA EGNOS PO, France
Mr Cristoforo Montefusco, ESA EGNOS PO, France
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Contents
! Introduction
! EGNOS and ESTB
! The Transition to EGNOS
! The User Experience
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Introduction
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EGNOS is nearing completion after six years of intense effort
1997
1998
1999
2000
2001
2002
2003
2004
2005
1997SystemDesignStarted
1998Preliminary
DesignReview
2002CriticalDesignReview
2004OperationalReadiness
Review
Today
ESTB has been developed in parallel as an EGNOS prototype providing pre-operational signals from February 2000
ESTBOperations
EGNOSOperations
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2003 is going to be a year of change and we need to ensure a smooth transition from ESTB to EGNOS
! We need to ensure that user perception meets user expectation in terms of performance
! User perception is driven by" signal broadcast by the geostationary (GEO) satellites" the wide area differential corrections (WAD) & integrity data
! The limiting factor here is the number of GEOs available for both systems
! We need to manage this transition so that users understand which GEO is being used by which system (ESTB or EGNOS) and the level of performance provided
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EGNOS and ESTB
!EGNOS
!ESTB
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EGNOS – the European GeostationaryNavigation Overlay Service - does what it says on the box!
! European coverage, standardised, and quality assured
! Broadcasts GPS look-alike signals from three GEOsatellites to augment GPS for navigation" 5m vertical, 1m horizontal" 6 second integrity time to alarm
! Highly compatible overlay to GPS so a single receiver and antenna can process GPS and EGNOS
! Services the needs of mission/safety critical users
Users will benefit from improved performance, removing the need for local-area differential in many cases
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The EGNOS architecture is highly redundant
! 34 RIMS – reference & integrity monitoring stations" each satellite has to be monitored by multiple RIMS before
corrections and integrity messages are generated
! 4 MCCs - mission control centres" one active and three hot spares
! 6 NLES – navigation land earth stations" one active and one hot spare per GEO
! Supporting infrastructure includes" PACF – performance assessment check-out facility" ASQF – application specific qualification facility
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-40 -30 -20 -10 0 10 20 30 4020
30
40
50
60
70
Longitude (°)
Latit
ude
(°)
AOR-EIOR
Artemis
RIMS
MCC
NLES
PACFASQF
LAN
GVL
ALB
HBK (South Africa)
ZUR
LAP
WRS
SCZ
ROMTOR
AUS
GON
RKK
PAR
KOU (French Guyana)
SWA
EGI
GLG
CRK
TRO
TRD
ACR MLG
PDM GOL
BRN
CNR
SDC
LSB
MAD
SOF
KIR
DJA
DAB
TLS
CTN
BNG (India)
NDH(Mauritania)
MON(Canada)
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The three GEOs provide triple coverage over Europe, the Mediterranean and Africa
Optimalperformance
Standardperformance
in GBA
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EGNOS and ESTB
!EGNOS
!ESTB
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The ESTB provides a pre-operational service and allows us to prepare both for EGNOS from 2004 and for Galileo later this decade
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The differences between ESTB and EGNOS for the same coverage area emphasise the pre-operational nature of the ESTB
YesNoService Guarantee
YesNoIntegrity
1m 95% throughout coverage area
1m 95% limited by RIMS densityAccuracy
62Number NLES
3412Number RIMS
41Number MCS
EGNOSESTBParameter
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The Transition to EGNOS
!Overview
!Signal Structure
!Using the GEO satellites
!RIMS Deployment
!SISNET
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We need to consider both the user and system needs during the transition period ! User expectation is performance specific while user
perception is driven by the quality of the WAD and integrity data received from the GEO satellites
! The WAD and integrity data quality are dependent on the distribution and density of the RIMS network
! ESA aims to ensure continuity of the ESTB service at least until EGNOS is declared operational, but at the same time it needs to deploy and test EGNOS
! The limiting factor is the number of GEOs available
It is crucial that users understand which GEO is being used by which system and the performance provided
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The Transition to EGNOS
! Overview
! Signal Structure
! Using the GEO satellites
! RIMS Deployment
! SISNET
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The EGNOS signal is similar to GPS and only slight modifications are required for a GPS receiver to track EGNOS
! Similar signal to GPS" Same frequency (1575.42 MHz) and ranging codes" Different data format (250 bps)
! Integrity" Coarse use / don’t use for all satellites (inc GEOs)" σ2
UDRE and σ2UIVE that are estimates of the errors remaining
after the WAD corrections used to compute error bounds
! WAD corrections" Separate terms for orbits, clocks and ionosphere" Fast and slow corrections for temporal de-correlation
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Cycle 2 Cycle 1
FS
EGNOSMCC
To Users
MessageSchedule
FS
Fast Corrections
Slow Corrections
PositionIntegrity
F S S S S F F S S S S F F S S S
GPS
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The EGNOS signal has three key benefits
! Compliant with international standards and interoperable with similar systems
! Design based on GPS" EGNOS range measurements enhance availability" EGNOS corrections can be used without purchasing an
additional receiver
! Provides enhanced accuracy and integrity
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Recent changes to the ESTB signal improve interoperability with other systems and allow all SBAS receivers to process ESTB
! SBAS Interoperability Working Group has developed SARPS1 for system developers and MOPS2 for receiver manufacturers
! Some initial confusion from test-messages" ESTB used Message Type 0 with all 0s" WAAS used MT2 data in MT 0
! Both approaches are allowed in the MOPS
! At 7:30 UTC on 1 April 2003 ESTB moved to the second format allowing all users equipped with GPS/SBAS receivers to benefit from ESTB & WAAS
1. Standards And Recommended Practices2. Minimum Operational Performance Standards
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The Transition to EGNOS
! Overview
! Signal Structure
! Using the GEO satellites
! RIMS Deployment
! SISNET
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AOR-E
IOR
ARTEMIS
IOR-W
July 03 October 03 December 03 April 04(ORR)
April 03
65.5° E, PRN 131
There are four GEOs currently available to support the transition from ESTB to EGNOS
EGNOSOperations
15.5° W, PRN 120
21.5° E, PRN 124
25° E, PRN 126
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The Transition to EGNOS
!Overview
!Signal Structure
!Using the GEO satellites
!RIMS Deployment
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RIMS deployment has been designed to deliver incremental improvements
! SIS 0 (Today) – end to end tests, message compliance, no performance objective" 6 RIMS, 1MCC, 1NLES
! SIS 1 (Q3 2003) – Level 2 performance (NPA/APV1)" 10-15 RIMS, 1MCC, 1NLES
! SIS 2 (Q4 2003) – Level 3 performance (APV2)" >25 RIMS, 2MCCs, 2NLES
HEALTH WARNING: all dates are preliminary and indicative, signals are subject to testing, do not use for operations until after ORR
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The Transition to EGNOS
! Overview
! Signal Structure
! Using the GEO satellites
! RIMS Deployment
! SISNET
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SISNeT solves EGNOS delivery problems in urban and other challenging environments
! Aviation and maritime users generally find it easy to maintain contact with the EGNOS GEOs to receive the WAD and integrity data
! It is far harder for land-mobile users because urban canyons block the GEO signals
! Critically, this is where EGNOS can bring real benefits to GPS" WAD corrections can deliver 10m (95%) with high
availability
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SISNeT allows users to access EGNOS in real-time over the internet
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It brings real benefits to users and can be accessed using mass market technology
! The EGNOS signal is available even if GEOs are not visible
! The data rate (< 1kbps) is ideal for GSM/GPRS
! An EGNOS receiver is not needed, only a link to the Internet
! Pedestrian or land mobile-users benefit from improved performance at higher mask angles
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The User Experience
! Receivers
! Expected performance
! Finding the latest information
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There are more than 120 receivers and 90 chipsets available – critically they must be compatible with the GPS/SBAS MOPS
! Receivers should be compatible with the GPS/SBAS MOPS (DO-229C)
! A WAAS receiver that is DO229-C will track EGNOS
! If you are in the EGNOS coverage area" Your receiver will track signals from other SBAS GEOs" Range measurements are valid if monitored by EGNOS" Only EGNOS WAD and integrity is valid
! Otherwise the receiver works normally" As an SBAS receiver if in SBAS coverage" As a GPS-only receiver elsewhere
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SBAS data processing is more complex than GPS
Estimate corrections for satellite clock and
ephemeris and the σσσσ2UDRE
Predict the ionospheric delay from the grid and
determine σσσσ2UIVE
WAD & Integrity Data
Correct the position solution
Compute a certified error bound (integrity)
Prudent users with commercial or safety critical applications will value the added confidence from EGNOS guaranteed services
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The User Experience
! Receivers
! Expected performance
! Finding the latest information
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The expected performance achievable from a specific GEO is dependent on the RIMS deployment and satellite/system selected
AOR-E
IOR
ARTEMIS
IOR-W
EGNOSOperations
Q3 2003 Q4 2003 Q1 2004
SIS - 1
SIS - 1
Q2 2003
SIS - 2
SIS - 2
SIS – 2
SIS – 2SIS - 0
ESTB
ESTB ESTB ESTB
ESTB/SIS - 2 ESTB/SIS - 2
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Expected EGNOS coverage for a high accuracy service (1m – 3m horizontal)
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Expected coverage for an APV service (equivalent to the current WAAS)
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The User Experience
! Receivers
! Expected performance
! Finding the latest information
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There are four ways for users to receive reliable and timely information
! ESA Helpdesk" Accessed through email
! ESA’s ESTB web pages" Links to EGNOS, ESTB, Galileo …
! EGNOS News" Hard copy, email circulation, download from web
! EGNOS CD ROM" Available here and from ESA
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Useful EGNOS-related links
[email protected] News
[email protected] ESTB Helpdesk
www.esa.int/SISNETESA SISNET Web Page
www.esa.int/ESTBESA ESTB Web Page
www.esa.int/EGNOSESA EGNOS Web Page
www.esa.int/navigationESA Navigation Web Page