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|Category=EGNOS
|Category=EGNOS
|Title={{PAGENAME}}
|Editors=GMV
|Authors=GMV.
|Level=Basic
|Level=Basic
|YearOfPublication=2011
|YearOfPublication=2011
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The [[Wikipedia:European Commission|European Commission (EC)]] intends to ensure the future of [[EGNOS Services|EGNOS services]] for GPS L1 legacy users until at least 2030.<ref name="EGNOS SoL SDD">[http://www.essp-sas.eu/service_definition_documents  EGNOS Safety of Life Service Definition Document]</ref> In this context, the budget should be secured to operate the system and manage the system obsolescence. Moreover, major EGNOS system evolutions (EGNOS V3) towards a multi frequency and multi constellation configuration are currently being assessed with the objective to have them operational by 2025.<ref name="EGNOS V3 contract">[https://www.airbus.com/newsroom/press-releases/en/2018/01/airbus-selected-by-esa-for-egnos-v3-programme.html Award of EGNOS V3 contract]</ref>
A technical assessment of the potential EGNOS evolution, EGNOS V3, is currently done by the European Space Agency within the European GNSS Evolution Programme. Airbus has been selected by the European Space Agency (ESA) as the prime contractor to develop EGNOS V3,<ref name="EGNOS V3 contract">[https://www.airbus.com/newsroom/press-releases/en/2018/01/airbus-selected-by-esa-for-egnos-v3-programme.html Award of EGNOS V3 contract]</ref> leading a consortium with partners from France, Germany, Spain and Switzerland. Airbus is responsible for the development, integration, deployment and preparation of EGNOS V3 operations, the overall performance of the system and the Central Processing Facility which is the heart of the real time navigation algorithms.
During the 6.5 year contract, around 100 people and 20 subcontractors will work on delivering the EGNOS V3 system. In 2023, the single frequency version will be available to replace the current operational version and, 18 months later, the final version in dual frequency will be delivered.
EGNOS is composed of a large network of about 50 ground stations deployed over Europe, Africa and North America, two master control centres located near Rome and Madrid, and a System Operation Support Centre in Toulouse. EGNOS will also use geostationary satellites navigation payload.<ref name="EGNOS V3 contract">[https://www.airbus.com/newsroom/press-releases/en/2018/01/airbus-selected-by-esa-for-egnos-v3-programme.html Award of EGNOS V3 contract]</ref>
==EGNOS Mission Roadmap and EGNOS Evolutions==
The European Parliament and the Council assigned the management of the EGNOS programme to the European Commission.<ref>[http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2008:196:0001:0011:en:PDF Regulation (EC) No 683/2008 of the European Parliament and of the Council of 9 July 2008 on the further implementation of the European satellite navigation programmes (EGNOS and Galileo)]</ref> On the other hand, ESA is the technical player responsible for system design
and development, and ESSP is the service provider.<ref name="Mid-term review">[http://europa.eu/rapid/press-release_MEMO-11-26_en.htm Mid-term review of the European satellite radio navigation programmes]</ref>
The European Commission, in its role of entity in charge of the management of the EGNOS programme, is defining the roadmap for the evolution of the EGNOS mission. This roadmap should cope with legacy and new missions:
*2011-2030: En-route / NPA / APV1 / LPV200 service based on augmentation of GPS L1 only. The [[EGNOS Safety of Life Service|Safety Of Life (SoL)]] service is being offered by EGNOS from early 2011 on a regional basis and this will be guaranteed up to 2030 in compliance with ICAO SBAS SARPS. The service is thus compliant with the aviation requirements for Approaches with Vertical Guidance (APV-I) and Category I precision approaches, as defined by ICAO in Annex 10. In order to grant this timeframe, it is still needed to achieve a programmatic commitment based on secured funds.
*2020+: It is planned that EGNOS will experiment a major evolution by 2025, EGNOS V3, including the fulfilment of the SBAS L1/L5 standard, expansion to dual-frequency, and evolution toward a multi-constellation concept.
To support this mission roadmap, EGNOS needs to evolve. This evolution is divided into minor updates of the current EGNOS version, EGNOS V2, and a major evolution leading to the provision of new services, EGNOS V3.
The minor evolutions in the current EGNOS version are performed in a regular basis at an approximate pace of an update per year, and aim at solving infrastructure obsolescence issues, at supporting the LPV200 service beyond APV1 and at improving the operation of the system.
The major evolution requires a full dedicated engineering cycle starting from the definition of the mission of the system highly coupled with a technical feasibility analysis in coordination with the evolution of the SBAS standards.
As regards the consolidation of the new EGNOS missions, the European Commission set up a consultative group of GNSS experts called the Mission Evolution Advisory Group (MEAG). MEAG aims at providing EC with independent advice and ''recommendations on potential evolutions of the mission objectives and the service definitions for the European satellite navigation programmes Galileo and EGNOS''.<ref>[https://ec.europa.eu/growth/content/call-applications-selection-new-members-mission-evolution-advisory-group-meag_es Mission Evolution Advisory Group (MEAG)]</ref>
The group is expected to critically assess changes of both user needs and scope of space-based PNT, both on European and international scale. Changes on the mission and service requirements for the Galileo and EGNOS programme may be analysed too, proposing suitable updates of the mission and service baseline.
MEAG members include experts from GNSS user communities, GNSS industry sectors, academia, national space agencies and other recognized experts from Member States. The MEAG meets on a regular basis with an indicative number of three meetings per year. The expert group may establish on an ad-hoc basis Working Groups to provide specialist support as required to carry out its activities. The MEAG shall further record and report its work results and recommendations on a yearly basis to the Commission.
As for the EGNOS technical evolution, ESA is managing several activities within the European GNSS Evolution Programme (see below).<br>
The European Commission and the European Space Agency are very active in the different international co-operation fora in [[SBAS Standards|SBAS standardisation]] and [[SBAS Interoperability|SBAS interoperability]] ensuring the co-ordination of the EGNOS evolution with that of the other [[SBAS Systems|SBAS in the world]].
On September 2015, after extensive ground and space testing, the SES-5 GEO satellite entered into the EGNOS operational platform, replacing Inmarsat-4F2. The satellite ensures reliable EGNOS services until 2026. It has been introduced through EGNOS System Release V241M, which enables a range of performance improvements.
<ref>[http://gpsworld.com/egnos-services-ensured-long-term-thanks-to-ses-5-geo-satellite/ EGNOS Services Ensured Long Term, Thanks to SES-5 GEO Satellite]</ref>


The European Space Agency (ESA) is currently completing the final qualification stages of the European Geostationary Navigation Overlay Service (EGNOS) and is in the process of developing the GALILEO system, a self-standing 30 satellite constellation for global satellite navigation. The European GNSS Evolution Program was defined in 2006 by ESA to address the second generation of these systems.<ref name=" ESA SISNeT Portal">EGNOS Evolution Plans and the GNSS Evolutions Programme; R. Lucas Rodriguez, F. Toran, R. Dellago, B. Arbesser-Rastburg, D. Flament; Proceedings of the 2009 International Technical Meeting of The Institute of Navigation January 26 - 28, 2009 </ref>
Changes in the EGNOS Space Segment configuration have been introduced in order to use the newest GEO satellites in detriment of the older ones. See [[EGNOS Space Segment | EGNOS Space Segment]] for details regarding the current operational platform.


As part of the evolutions considered, three more RIMS are scheduled to be deployed in Agadir (Morrocco), Athens (Greece) and Alexandria (Egypt) providing the extension of EGNOS signal coverage to northern Africa.
==The European GNSS Evolution Programme==
The European GNSS Evolution Programme (EGEP) is an ESA optional programme supported by 17 Member States and Canada which was defined in 2006 by ESA to address the second generation of the EGNOS and Galileo systems.<ref name=" ESA SISNeT Portal">EGNOS Evolution Plans and the GNSS Evolutions Programme; R. Lucas Rodriguez, F. Toran, R. Dellago, B. Arbesser-Rastburg, D. Flament; Proceedings of the 2009 International Technical Meeting of The Institute of Navigation January 26 - 28, 2009.</ref>


Besides, processing improvements are scheduled for the EGNOS signal, including iono algorithm pre-processing fine tuning.
Its primary aim is to undertake research and development in and verification of technologies relating to regional space-based augmentation systems (SBAS) and global navigation satellite systems (GNSS).
Through forward-looking activities, the programme ensures that European industry has timely availability of competitive and innovative capabilities required for the evolution of EGNOS and Galileo. This applies to future requirements in the short, medium and long term.


Finally, the deployment of EGNOS v3 is scheduled to cover the Multi-Constellation Regional System (MRS) concept and implement a GPS L5 augmentation service.
EGEP also provides a framework for scientific research enabled by GNSS, which spans a wide range of disciplines, from atmosphere and climate modelling through time and space references to fundamental physics.
The programme is being implemented through activities anchored in Work Plans that are being successively defined by the Agency and approved by the Participating States according to the following objectives: <ref>[https://www.esa.int/Our_Activities/Navigation/GNSS_Evolution/About_the_European_GNSS_Evolution_Programme About the European GNSS Evolution Programme]</ref>


==GNSS Evolution program FrameWork==
*begin defining future system architectures for EGNOS and Galileo and prepare the technology for future versions of these systems
*support the definition of how to implement the next version of EGNOS, and prepare the technology for it
*provide testbeds and system tools
*improve Agency knowledge of GNSS performance monitoring and the principal environmental factors influencing performance
*promote and support scientific exploitation of EGNOS and Galileo


As part of the GNSS Evolution program, ESA called for two parallel studies in the scope of a Multi-constellation Regional System (MRS), that is, the evolution of the EGNOS concept to cope within a multi-constellation environment (Galileo, GPS, others GNSS constellations), and a multi-frequency scenario (GPS L1, L5; Galileo L1, E5a, E5b, E6, etc..).<ref name=" EGNOS Evolutions: the MultiConstellation Horizon MRS">[http://www.enc-gnss09.it/proceedingsPDF/A2/3_A2.pdf EGNOS Evolutions: the MultiConstellation Horizon MRS; P. Durba, E. Armengou, Indra Espacio (Spain); M. Tossaint, European Space Agency (The Netherlands)] </ref>


With this multi-constellation scenario, and with multiple frequencies available for navigation, the wide area regional augmentation systems must evolve and need to be adapted to this new behaviour. The next generation of the regional augmentation systems will not only be an adaptation of the architecture to the current state-of-art but also an important change of the concept. Considering only the new approach to the ground segment, this paper presents the alternative implementations of the integrity concepts, the different broadcast means and possible architectures analysed.
Among many other tasks, the first phase of this programme included two parallel studies about the concept of Multi-Constellation Regional System (MRS) over 2007-2009. An outcome of this work was  a generic MRS architecture baseline that should be considered as a candidate target for V3 functional architecture and further assessed and refined within the EGNOS V3 phase A definition study.<ref name="EGNOS V3 SOW">Statement of Work EGNOS V3 Definition Phase, ESA-DTEN-NF-SoW/01281, Issue 1.0, 08/07/2010, ESA.</ref>


MRS mission is a natural evolution of a regional  system, such as EGNOS, considering the advent of new constellations and new frequencies in the GNSS panorama. As GNSS modernisation plans are today under definition and other studies are assessing possible evolutions of GNSS systems beyond 2015, the MRS Study is focused on the 2012-2015 timeframe.
The second phase of EGEP on SBAS (over 2010-2011) was devoted to the consolidation of system evolutions and to field testing. It is broken down into three main parts:<ref name="EGNOS V3 SOW"/>
* EGNOS V3 Definition Phase, aiming at preparing the new EGNOS system generation to address obsolescence issues, robustness improvement, new services, standard evolutions, coverage extension, use of new broadcast means, with a view to start preparing the EGNOS V3 implementation phase at a later stage (post 2013).
* Experimentations with several Test-Beds based on using a complete or partial SPEED (Support Platform for EGNOS Evolutions & Demonstrations) infrastructure.
* SPEED related activities in order to procure, install, operate and maintain the SPEED V1 engineering platform allowing to run the above tests and to develop an upgraded version of SPEED V1 platform to implement new features in the Host Structure of SPEED necessary to support a second phase of experimentations (at a later stage).


==EGNOS Evolution Features==
The above-mentioned test-beds have the following objectives:<ref name="EGNOS V3 SOW"/>
* HIS (High Integrity Service) to develop one system Test Bed (based on SPEED) to engineer and experiment high Integrity (similar to Safety Of Life for multi-modal applications) and authentication (authenticated GEO signal + GEO ranging/UDRE).
* ARCTIC to experiment maritime and aeronautics services in northern latitudes.
* HPS (High Precision Service) to demonstrate and generate interest in an HPS service (with integrity), based on, first GPS and later GPS+GALILEO.
* MLU (MRS Land User service) to investigate, demonstrate and develop new services for Land Users: Proof of Position, Authentication and Emergency Services.


As a multi-constellation, multi-frequency and multi-broadcast system, the MRS system shall not only continue providing an SBAS service to L1 users but shall also cover GPS L5 and Galileo L1 and L5/E5 users. The system evolution considers different dissemination channels, including the SBAS GEO (Geostationary Earth Orbit) L1 and L5 channels, Galileo MEO (Medium Earth Orbit) ERIS (External Regional Integrity System) channels and other satellite or terrestrial means to be defined according to regional or user defined interests (e.g. SISNET, LORAN-C, etc).
In 2011, two parallel contracts have been commissioned by ESA to perform a Phase A (feasibility) study of EGNOS V3 Phase A. These studies considered different target missions with different levels of consolidation:<ref>EGNOS V3 Mission Guidelines Document, E-RD-SYS-E-0039-ESA, Issue 1.1, 18/01/2011, European Space Agency</ref>


The high level objectives defined by the Evolution program are the following:<ref name=" EGNOS Evolutions: the MultiConstellation Horizon MRS"/>
*Consolidated Missions:
** Provide [[GPS General Introduction|GPS]] L1-only augmentation to ensure [[EGNOS Services|EGNOS service]] to legacy users at least until 2030.
** Provide [[GPS General Introduction|GPS]] dual frequency augmentation for LPV-200 service in Europe, Middle-East and Africa.
** Provide [[GPS General Introduction|GPS]] and [[GALILEO General Introduction|GALILEO]] dual frequency augmentation to provide robust (to constellation depletion) LPV-200 service in Europe, Middle-East and Africa.


* To maximize European ‘User’ Performance when combining EGNOS and Galileo infrastructures, allowing SoL service provision.
*Missions to be consolidated:
* To optimize cost of operation and infrastructure of both systems when combined in MRS, keeping independence of both systems and ensuring robustness against GNSS failures.
** Provide [[GPS General Introduction|GPS]] and [[GALILEO General Introduction|GALILEO]] dual frequency augmentation for an enhanced service (lower Vertical Alert Limit than LPV-200) in current [[Wikipedia:European Union|European Union (EU27)]] plus Switzerland and Norway.
* To provide mainly an integrity service for safety of life aviation or liability critical applications. 
** Provide robustness to the loss of one frequency in [[Wikipedia:European Union|EU27]] plus Switzerland and Norway.
* To provide regional GPS and Galileo integrity and continuity by using MRS and Galileo.
* Understood as a multi-constellation (GPS/GAL) multi-frequency (L1/E5) and multibroadcast (GEO, MEO and others) system, to provide a service assuming all combination of mono/multi constellation and mono/multi frequency users.  
* To provide better availability of SBAS integrity for regions of poor GEO reception through additional Galileo ERIS MEO broadcast of integrity information or other means.
* To enhance ionosphere monitoring accuracy by adding Galileo observations or decrease number of RIMS.


==Integrity Approach==
Concerning the provision of additional services (i.e.: support to ADS-B, maritime, high precision, land-users…), the objective is that the design will ensure that EGNOS has sufficient in-built expandability and upgradeability capabilities to allow the provision of new products.


==Notes==
==Notes==
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[[Category:EGNOS]]
[[Category:EGNOS]]
[[Category:EGNOS Future and Evolution]]

Latest revision as of 15:51, 18 March 2020


EGNOSEGNOS
Title EGNOS Future and Evolutions
Edited by GMV
Level Basic
Year of Publication 2011
Logo GMV.png

The European Commission (EC) intends to ensure the future of EGNOS services for GPS L1 legacy users until at least 2030.[1] In this context, the budget should be secured to operate the system and manage the system obsolescence. Moreover, major EGNOS system evolutions (EGNOS V3) towards a multi frequency and multi constellation configuration are currently being assessed with the objective to have them operational by 2025.[2]

A technical assessment of the potential EGNOS evolution, EGNOS V3, is currently done by the European Space Agency within the European GNSS Evolution Programme. Airbus has been selected by the European Space Agency (ESA) as the prime contractor to develop EGNOS V3,[2] leading a consortium with partners from France, Germany, Spain and Switzerland. Airbus is responsible for the development, integration, deployment and preparation of EGNOS V3 operations, the overall performance of the system and the Central Processing Facility which is the heart of the real time navigation algorithms. During the 6.5 year contract, around 100 people and 20 subcontractors will work on delivering the EGNOS V3 system. In 2023, the single frequency version will be available to replace the current operational version and, 18 months later, the final version in dual frequency will be delivered. EGNOS is composed of a large network of about 50 ground stations deployed over Europe, Africa and North America, two master control centres located near Rome and Madrid, and a System Operation Support Centre in Toulouse. EGNOS will also use geostationary satellites navigation payload.[2]


EGNOS Mission Roadmap and EGNOS Evolutions

The European Parliament and the Council assigned the management of the EGNOS programme to the European Commission.[3] On the other hand, ESA is the technical player responsible for system design and development, and ESSP is the service provider.[4]

The European Commission, in its role of entity in charge of the management of the EGNOS programme, is defining the roadmap for the evolution of the EGNOS mission. This roadmap should cope with legacy and new missions:

  • 2011-2030: En-route / NPA / APV1 / LPV200 service based on augmentation of GPS L1 only. The Safety Of Life (SoL) service is being offered by EGNOS from early 2011 on a regional basis and this will be guaranteed up to 2030 in compliance with ICAO SBAS SARPS. The service is thus compliant with the aviation requirements for Approaches with Vertical Guidance (APV-I) and Category I precision approaches, as defined by ICAO in Annex 10. In order to grant this timeframe, it is still needed to achieve a programmatic commitment based on secured funds.
  • 2020+: It is planned that EGNOS will experiment a major evolution by 2025, EGNOS V3, including the fulfilment of the SBAS L1/L5 standard, expansion to dual-frequency, and evolution toward a multi-constellation concept.

To support this mission roadmap, EGNOS needs to evolve. This evolution is divided into minor updates of the current EGNOS version, EGNOS V2, and a major evolution leading to the provision of new services, EGNOS V3.

The minor evolutions in the current EGNOS version are performed in a regular basis at an approximate pace of an update per year, and aim at solving infrastructure obsolescence issues, at supporting the LPV200 service beyond APV1 and at improving the operation of the system.

The major evolution requires a full dedicated engineering cycle starting from the definition of the mission of the system highly coupled with a technical feasibility analysis in coordination with the evolution of the SBAS standards.

As regards the consolidation of the new EGNOS missions, the European Commission set up a consultative group of GNSS experts called the Mission Evolution Advisory Group (MEAG). MEAG aims at providing EC with independent advice and recommendations on potential evolutions of the mission objectives and the service definitions for the European satellite navigation programmes Galileo and EGNOS.[5] The group is expected to critically assess changes of both user needs and scope of space-based PNT, both on European and international scale. Changes on the mission and service requirements for the Galileo and EGNOS programme may be analysed too, proposing suitable updates of the mission and service baseline. MEAG members include experts from GNSS user communities, GNSS industry sectors, academia, national space agencies and other recognized experts from Member States. The MEAG meets on a regular basis with an indicative number of three meetings per year. The expert group may establish on an ad-hoc basis Working Groups to provide specialist support as required to carry out its activities. The MEAG shall further record and report its work results and recommendations on a yearly basis to the Commission.

As for the EGNOS technical evolution, ESA is managing several activities within the European GNSS Evolution Programme (see below).
The European Commission and the European Space Agency are very active in the different international co-operation fora in SBAS standardisation and SBAS interoperability ensuring the co-ordination of the EGNOS evolution with that of the other SBAS in the world.

On September 2015, after extensive ground and space testing, the SES-5 GEO satellite entered into the EGNOS operational platform, replacing Inmarsat-4F2. The satellite ensures reliable EGNOS services until 2026. It has been introduced through EGNOS System Release V241M, which enables a range of performance improvements. [6]

Changes in the EGNOS Space Segment configuration have been introduced in order to use the newest GEO satellites in detriment of the older ones. See EGNOS Space Segment for details regarding the current operational platform.

The European GNSS Evolution Programme

The European GNSS Evolution Programme (EGEP) is an ESA optional programme supported by 17 Member States and Canada which was defined in 2006 by ESA to address the second generation of the EGNOS and Galileo systems.[7]

Its primary aim is to undertake research and development in and verification of technologies relating to regional space-based augmentation systems (SBAS) and global navigation satellite systems (GNSS). Through forward-looking activities, the programme ensures that European industry has timely availability of competitive and innovative capabilities required for the evolution of EGNOS and Galileo. This applies to future requirements in the short, medium and long term.

EGEP also provides a framework for scientific research enabled by GNSS, which spans a wide range of disciplines, from atmosphere and climate modelling through time and space references to fundamental physics. The programme is being implemented through activities anchored in Work Plans that are being successively defined by the Agency and approved by the Participating States according to the following objectives: [8]

  • begin defining future system architectures for EGNOS and Galileo and prepare the technology for future versions of these systems
  • support the definition of how to implement the next version of EGNOS, and prepare the technology for it
  • provide testbeds and system tools
  • improve Agency knowledge of GNSS performance monitoring and the principal environmental factors influencing performance
  • promote and support scientific exploitation of EGNOS and Galileo


Among many other tasks, the first phase of this programme included two parallel studies about the concept of Multi-Constellation Regional System (MRS) over 2007-2009. An outcome of this work was a generic MRS architecture baseline that should be considered as a candidate target for V3 functional architecture and further assessed and refined within the EGNOS V3 phase A definition study.[9]

The second phase of EGEP on SBAS (over 2010-2011) was devoted to the consolidation of system evolutions and to field testing. It is broken down into three main parts:[9]

  • EGNOS V3 Definition Phase, aiming at preparing the new EGNOS system generation to address obsolescence issues, robustness improvement, new services, standard evolutions, coverage extension, use of new broadcast means, with a view to start preparing the EGNOS V3 implementation phase at a later stage (post 2013).
  • Experimentations with several Test-Beds based on using a complete or partial SPEED (Support Platform for EGNOS Evolutions & Demonstrations) infrastructure.
  • SPEED related activities in order to procure, install, operate and maintain the SPEED V1 engineering platform allowing to run the above tests and to develop an upgraded version of SPEED V1 platform to implement new features in the Host Structure of SPEED necessary to support a second phase of experimentations (at a later stage).

The above-mentioned test-beds have the following objectives:[9]

  • HIS (High Integrity Service) to develop one system Test Bed (based on SPEED) to engineer and experiment high Integrity (similar to Safety Of Life for multi-modal applications) and authentication (authenticated GEO signal + GEO ranging/UDRE).
  • ARCTIC to experiment maritime and aeronautics services in northern latitudes.
  • HPS (High Precision Service) to demonstrate and generate interest in an HPS service (with integrity), based on, first GPS and later GPS+GALILEO.
  • MLU (MRS Land User service) to investigate, demonstrate and develop new services for Land Users: Proof of Position, Authentication and Emergency Services.

In 2011, two parallel contracts have been commissioned by ESA to perform a Phase A (feasibility) study of EGNOS V3 Phase A. These studies considered different target missions with different levels of consolidation:[10]

  • Consolidated Missions:
    • Provide GPS L1-only augmentation to ensure EGNOS service to legacy users at least until 2030.
    • Provide GPS dual frequency augmentation for LPV-200 service in Europe, Middle-East and Africa.
    • Provide GPS and GALILEO dual frequency augmentation to provide robust (to constellation depletion) LPV-200 service in Europe, Middle-East and Africa.
  • Missions to be consolidated:
    • Provide GPS and GALILEO dual frequency augmentation for an enhanced service (lower Vertical Alert Limit than LPV-200) in current European Union (EU27) plus Switzerland and Norway.
    • Provide robustness to the loss of one frequency in EU27 plus Switzerland and Norway.

Concerning the provision of additional services (i.e.: support to ADS-B, maritime, high precision, land-users…), the objective is that the design will ensure that EGNOS has sufficient in-built expandability and upgradeability capabilities to allow the provision of new products.

Notes

References

  1. ^ EGNOS Safety of Life Service Definition Document
  2. ^ a b c Award of EGNOS V3 contract
  3. ^ Regulation (EC) No 683/2008 of the European Parliament and of the Council of 9 July 2008 on the further implementation of the European satellite navigation programmes (EGNOS and Galileo)
  4. ^ Mid-term review of the European satellite radio navigation programmes
  5. ^ Mission Evolution Advisory Group (MEAG)
  6. ^ EGNOS Services Ensured Long Term, Thanks to SES-5 GEO Satellite
  7. ^ EGNOS Evolution Plans and the GNSS Evolutions Programme; R. Lucas Rodriguez, F. Toran, R. Dellago, B. Arbesser-Rastburg, D. Flament; Proceedings of the 2009 International Technical Meeting of The Institute of Navigation January 26 - 28, 2009.
  8. ^ About the European GNSS Evolution Programme
  9. ^ a b c Statement of Work EGNOS V3 Definition Phase, ESA-DTEN-NF-SoW/01281, Issue 1.0, 08/07/2010, ESA.
  10. ^ EGNOS V3 Mission Guidelines Document, E-RD-SYS-E-0039-ESA, Issue 1.1, 18/01/2011, European Space Agency