EUROMED GNSS II/MEDUSA project

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


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


• 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:


• 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)


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


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)


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


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


• 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


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’


• 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


• 4 services (OS, CS, PRS, SAR)

• Highly accurate global positioning services worldwide

• Under deployment (early services by end of 2014)

EGNOS SoL


ICAO operational requirements

EGNOS requirements


EGNOS space infrastructure and service area


• 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


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)


Euromed GNSS II/MEDUSA

MEDiterranean follow-Up for EGNOS Adoption

May 2012 for 3 years

• Pool of EU experts

• Euromed partner countries

Goal:


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


the assistance actions put in place by the project

email: [email protected]

Thank you!

Questions?


ICAO recommendations (1/2)


ICAO recommendations (2/2)


ICAO PBN Roadmap


ICAO Navigation roadmap


EGNOS users

• EGNOS OS:

Open, not regulated framework

• EGNOS EDAS:

Registered users, professional applications, regulatory/liability needs

• EGNOS SoL:


• 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


• 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

EUROMED GNSS II/MEDUSA project

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