EUROMED GNSS II/MEDUSA project
GNSS/SBAS interoperability
1st Interoperability Seminar, Euromed Aviation II, Madrid, March 2014 1
GNSS/SBAS interoperability
Contents
• GNSS/SBAS interoperability
• European GNSS (E-GNSS)
• Euromed GNSS II/MEDUSA
1st Interoperability Seminar, Euromed Aviation II, Madrid, March 2014 2
Main principles
• For aviation the GNSS systems, basic constellations and augmentation
systems, are fundamental radio navigation aids to accomplish the
navigation strategies (PBN roadmap) established by ICAO
• An international multi-constellation (GPS, GLONASS, Galileo…) and
multi-SBAS scenario is developing
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• The interoperability and compatibility requirements, for an optimal
coexistence and exploitation of these systems, have to be ensured
• The ideal scenario would be to reach a “systems interchangeability”,
understood as the transparent use of any set of open signals from any
combination of systems and satellites
International Committee on GNSS (1)
• The UN ICG defines interoperability as:
“The ability of global and regional navigation satellite systems and
augmentations and the services they provide to be used together to
provide better capabilities at the user level than would be achieved
by relying solely on the open signals of one system”
• Interoperability is considered at two different levels:
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• Interoperability is considered at two different levels:
– At system level, as the capability of all systems to provide the same
navigation solution standalone (with the respective performance
constraints)
– At signal level, interoperability is achieved when the signals provided
by different systems are similar enough to allow a GNSS receiver to
use them with minor modifications
• The ICG defines compatibility as: “the ability of global and regional
navigation satellite systems and augmentations to be used separately
or together without causing unacceptable interference and/or other
harm to an individual system and/or service”
• GNSS standardization: interoperability and compatibility principles are
translated for aviation through the international standardization
International Committee on GNSS (2)
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translated for aviation through the international standardization
organizations, e.g. ICAO-SARPS, RTCA/EUROCAE-MOPS/EDs, EASA-
ETSO, EASA-AMC
• Operators comply with the international requirements, and thus
avionics are developed under interoperability criteria. Most countries
directly transpose standards into their national legislations for
airworthiness certification and operational approval procedures
SBAS
• A Satellite Based Augmentation System (SBAS) is a navigation system
that supplements Global Navigation Satellite Systems (GNSS) providing
a more accurate and reliable navigation service than GNSS alone, in
terms of: accuracy, integrity, service continuity and availability
• SBAS began with the implementation of the Wide Area Augmentation
System (WAAS) in the United States. Interoperable SBASs are also being
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System (WAAS) in the United States. Interoperable SBASs are also being
implemented in other regions of the world
• SBAS is available in many parts of the world
Current SBAS service coverage is provided by a collection of
interoperable systems
Worldwide SBAS coverage is continuing to grow
SBAS around the world
All SBAS systems are designed according to the same standard
(i.e. ICAO SARPs)
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SBAS’s principles
• ICAO Standards And Recommended Practices (SARPs) provide
overarching standards and guidance for Global SBAS implementation
• ICAO SARPs Annex 10 and Aviation MOPS:
– Include the standards for GNSS receiver and on-board equipment
– Give the frame for the interoperability of different SBAS systems,
ensuring seamless transition between SBAS service areas
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ensuring seamless transition between SBAS service areas
SBAS Interoperability Working Group
• IWG is the forum for SBAS service providers to assure common
understanding and implementation of the SARPs
• IWG forum allows coordination to enable use of a single avionics
technology designed for easy transition from one SBAS region to
another
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• IWG forum allows coordination to enable:
– The use of a single avionics technology designed for easy transition
from one SBAS region to another
– Harmonized SBAS technical improvements/evolutions/modernization
SBAS evolution dual frequency
• GNSS dual frequency is under development to:
– Increase SBAS availability and performance
– Improve robustness
• Avionics manufacturers and operators:
– Support multi-constellation/multi-frequency avionics as flight-
certified navigation solutions
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certified navigation solutions
– Provide continued support to legacy L1-only users
European-GNSS: EGNOS
• European SBAS
• Part of an inter-regional/interoperable SBAS service
• Augmentation of GPS L1 signal
• 3 services (OS, SoL, EDAS)
• Designed for civil aviation, also for multi-modal uses
• Regional infrastructures & services‘It’s there, use it’
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• Regional infrastructures & services
• Today ECAC coverage with built-in capability to be
extended to other regions, such as Euromed regions
and EU neighbouring countries
• Global infrastructures & services
• Worldwide coverage
• Autonomous system
• Interoperable and compatible with other GNSS
• 4 services (OS, CS, PRS, SAR)
European-GNSS: Galileo
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• 4 services (OS, CS, PRS, SAR)
• Highly accurate global positioning services worldwide
• Under deployment (early services by end of 2014)
EGNOS SoL
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ICAO operational requirements
EGNOS requirements
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EGNOS space infrastructure and service area
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• Geostationary satellites broadcasting EGNOS messages to provide the SIS
that is today used by the EGNOS aviation users
• Euromed GNSS programme:
– Infrastructure implementation for EGNOS service extension
– EGNOS services exploitation and operational implementation (MEDUSA)
Today EGNOS service coverage
EGNOS SoL (APV-I) availability on 11 February 2014
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EGNOS SoL - Service Definition Document (SDD)
• EGNOS SoL SDD describes the characteristics and conditions of access to
the service. Published on June 2013 (http://www.essp-
sas.eu/service_definition_documents)
• EGNOS Service Notices generated whenever there is any complementary
information to be provided to users that could affect the SoL SDD
contents (http://www.essp-sas.eu/service_notices)
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Euromed GNSS II/MEDUSA
MEDiterranean follow-Up for EGNOS Adoption
May 2012 for 3 years
• Pool of EU experts
• Euromed partner countries
Goal:
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Goal:
• Best practices sharing
• Aid to countries to prepare/set up the basis for the feasibility
assessment/decision making process
• Aid to countries towards the exploitation of EGNOS services and
operational adoption
• Technological transfer and capacity building
• A programme of technical assistance actions tailored on specific
needs/local, sub-regional, regional
Galileo EuroMed Cooperation Office
• Located in Tunis (Tunisia)
• Operated by MEDUSA
• Acting as a point of reference for all Euromed countries and towards
Europe
Through GEMCO, MEDUSA catalyses and fosters initiatives related to E-
GNSS in the Euromed region, and contributes to the implementation of
the assistance actions put in place by the project
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the assistance actions put in place by the project
email: [email protected]
Thank you!
Questions?
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ICAO recommendations (1/2)
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ICAO recommendations (2/2)
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ICAO PBN Roadmap
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ICAO Navigation roadmap
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EGNOS users
• EGNOS OS:
Open, not regulated framework
• EGNOS EDAS:
Registered users, professional applications, regulatory/liability needs
• EGNOS SoL:
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• EGNOS SoL:
Navigation service provided under SES
EGNOS SoL users defined within SoL SDD
– Airspace Users (as defined by SES regulation) equipped with EGNOS
certified receivers (TSOS/ETSOs C144,C145 or C146)
– Certified Air Navigation Service Providers (ANSPs) having signed an EGNOS
Working Agreement (EWA) with the EGNOS Service Provider (ESSP)
EGNOS SoL - main principles
• Designed:
Compliant to APV- I
To support civil aviation operations down to LPV minima (CAT-I)
To meet ICAO SARPs
Compliant to RTCA Minimum Operational Performance Standards (MOPS) for
airborne navigation equipment using the GPS augmented by SBAS
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• Enabling Performance Based Navigation (PBN)
• Not requiring the installation (and maintenance) of ground-based landing
NAVAIDs
• Requiring certified avionics in accordance with ICAO SARPs
• Interoperable with other SBAS to enable aircraft seamless transitions between
SBAS systems and interoperable SBAS avionics