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Difference between revisions of "SBAS Systems"

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==SBAS in the World==
 
==SBAS in the World==
[[File:SBAS_Service_Areas.png|300px|SBAS Indicative Service Areas. Source: GSA User Technology Report 2018 <ref>[https://www.gsa.europa.eu/system/files/reports/gnss_user_tech_report_2018.pdf GSA User Technology Report 2018]</ref> |thumb]]
+
[[File:SBAS Service Areas 2021.PNG|300px|SBAS Indicative Service Areas. Source: GSA User Technology Report 2020 <ref>[https://www.euspa.europa.eu/sites/default/files/uploads/technology_report_2020.pdf GSA User Technology Report 2020]</ref> |thumb]]
From all the SBAS systems in the world, some of them are already operational ([[WAAS General Introduction|WAAS]], [[MSAS General Introduction|MSAS/QZSS]],[[GAGAN|GAGAN System]], [[EGNOS General Introduction|EGNOS]]), other are under implementation ([[SDCM|SDCM]], China’s Beidou SBAS BDSBAS, previously known as [[SNAS]]) while others are under feasibility studies, as is the case of [[Other SBAS|SACCSA]], ASECNA <ref name="ASECNAC">[https://egnos-user-support.essp-sas.eu/new_egnos_ops/sites/default/files/EWS19%20ASECNA%20-%20SBAS-ASECNA%20programme%20status.pdf ASECNA status]</ref>, KASS<ref name"KAAS">[https://egnos-user-support.essp-sas.eu/new_egnos_ops/sites/default/files/EWS19%20KARI%20-%20KASS%20programme%20status.pdf KAAS status (2019)]</ref> in South Korea planned for 2022 or SPAN (Southern Positioning Augmentation Network) in Australia<ref name"Australian_SBAS">[https://www.crcsi.com.au/sbas/ Australian SBAS]</ref> and New Zealand.
+
From all the SBAS systems in the world, some of them are already operational ([[WAAS General Introduction|WAAS]], [[MSAS General Introduction|MSAS/QZSS]],[[GAGAN|GAGAN System]], [[EGNOS General Introduction|EGNOS]]), other are under implementation ([[SDCM|SDCM]], China’s Beidou SBAS BDSBAS, previously known as [[SNAS]]) while others are under feasibility studies, as is the case of [[Other SBAS|SACCSA]], A-SBAS (ASECNA) <ref name="ASECNAC">[https://egnos-user-support.essp-sas.eu/new_egnos_ops/sites/default/files/EWS19%20ASECNA%20-%20SBAS-ASECNA%20programme%20status.pdf ASECNA status]</ref>, KASS<ref name="KAAS">[https://egnos-user-support.essp-sas.eu/new_egnos_ops/sites/default/files/EWS19%20KARI%20-%20KASS%20programme%20status.pdf KAAS status (2019)]</ref> in South Korea planned for 2022 or SouthPAN (Southern Positioning Augmentation Network) in Australia<ref name"Australian_SBAS">[https://www.crcsi.com.au/sbas/ Australian SBAS]</ref> and New Zealand.
  
 
According to the Interoperability Working Group (IWG) of SBAS System several evolutions are expected in the coming years:<ref>[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/briefings/media/SBAS_Global_Status_June%202014.pdf Global SBAS Status], Satellite Based Augmentation System (SBAS), Interoperability Working Group(IWG), June 2014</ref>
 
According to the Interoperability Working Group (IWG) of SBAS System several evolutions are expected in the coming years:<ref>[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/briefings/media/SBAS_Global_Status_June%202014.pdf Global SBAS Status], Satellite Based Augmentation System (SBAS), Interoperability Working Group(IWG), June 2014</ref>
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* GNSS Multiple-Constellation Operations (Galileo, BeiDou);
 
* GNSS Multiple-Constellation Operations (Galileo, BeiDou);
 
* EGNOS and MSAS reference network expansion;
 
* EGNOS and MSAS reference network expansion;
* SDCM and other SBAS systems under development to .
+
* SDCM and other SBAS systems under development to become operational.
  
When these evolutions are completed it is though that the global SBAS coverage will suffer an increase from the 7.54% at 99% (only WAAS, EGNOS and MSAS) to 92.65%, considering the use of multiple-constellation (GPS and Galileo).
+
When these evolutions are completed it is thought that the global SBAS coverage will suffer an increase from the 7.54% at 99% (only WAAS, EGNOS and MSAS) to 92.65%, considering the use of multiple-constellation (GPS and Galileo).
 
[[File:Prediction_On_SBAS_Availability.png|450px|Prediction of World Wide SBAS coverage|center|thumb]]
 
[[File:Prediction_On_SBAS_Availability.png|450px|Prediction of World Wide SBAS coverage|center|thumb]]
  
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On July 10, 2003, the WAAS signal was activated for safety-of-life aviation, covering 95% of the United States, and portions of Alaska.<ref name="WAAS WIKI"/> At present, WAAS supports en-route, terminal and approach operations down to a full LPV-200 (CAT-I like Approach Capability) for the CONUS, Mexico and Canada.
 
On July 10, 2003, the WAAS signal was activated for safety-of-life aviation, covering 95% of the United States, and portions of Alaska.<ref name="WAAS WIKI"/> At present, WAAS supports en-route, terminal and approach operations down to a full LPV-200 (CAT-I like Approach Capability) for the CONUS, Mexico and Canada.
  
WAAS is foreseen to implement DFMC capabilities in the future.
+
The WAAS programme is continuously in evolution; three development phases have been already covered, and there are on-going plans to improve the capability of the system in parallel with the evolution of the SBAS standards towards a dual-frequency augmentation service.<ref>[http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/library/satnav/media/SatNav_March08.pdf SatNav News, Vol. 33, March 2008,] [http://www.faa.gov/ Federal Aviation Agency (FAA).]</ref>
  
 
<gallery widths="200px">
 
<gallery widths="200px">
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Image:waas_performance.png|WAAS performances
 
Image:waas_performance.png|WAAS performances
 
</gallery>
 
</gallery>
 +
 +
==EGNOS==
 +
[[EGNOS General Introduction|EGNOS (European Geostationary Navigation Overlay Service)]] is the European SBAS system that complements the existing satellite navigation services provided by the US [[GPS General Introduction|Global Positioning System]] (GPS). EGNOS constitutes together with [[GALILEO General Introduction|Galileo]] the two major initiatives in Europe in terms of satellite navigation. Future evolutions such as EGNOS V3 are expected to augment both GPS and Galileo constellation data.
 +
 +
EGNOS currently supports the following [[EGNOS Services|services]]:<ref name= "GSA EGNOS Services">[https://www.gsa.europa.eu/egnos/services "EGNOS services in GSA website"]</ref>
 +
*The [[EGNOS Open Service|Open Service]] (OS), freely available to the public over Europe. This service was officially started on 1 October 2009.
 +
*The [[EGNOS Safety of Life Service|Safety of Life Service]] (SoL), that provides the most stringent level of signal-in-space performance to all communities of Safety of Life users over Europe. This service was officially started on 2 March 2011.
 +
*The [[EGNOS Data Access System (EDAS) | EGNOS Data Access System (EDAS)]] represents the provision of additional data for professional users not provided by the EGNOS signal broadcast by geostationary satellites but by other distribution channels.
  
 
==MSAS/QZSS==
 
==MSAS/QZSS==
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</gallery>
 
</gallery>
  
QZSS (Quasi-Zenith Satellite System) I the Japanese satellite navigation program with a regional service coverage based on orbits for quasi-zenith satellites to broadcast radio signals from high elevation angle into urban canyons. MSAS evolutions will take advantage of the Japanese QZSS and to include DFMC capabilities in the future<ref name"MSAS_future">[https://www.icao.int/APAC/APAC-RSO/GBASSBAS%20Implementation%20Workshop/1-6_MSAS%20System%20Development_Rev2%20(S%20Saito).pdf MSAS status and evolutions]</ref>.
+
QZSS (Quasi-Zenith Satellite System) is the Japanese satellite navigation program with a regional service coverage based on orbits for quasi-zenith satellites to broadcast radio signals from high elevation angle into urban canyons. MSAS evolutions will take advantage of the Japanese QZSS and to include DFMC capabilities in the future<ref name"MSAS_future">[https://www.icao.int/APAC/APAC-RSO/GBASSBAS%20Implementation%20Workshop/1-6_MSAS%20System%20Development_Rev2%20(S%20Saito).pdf MSAS status and evolutions]</ref>.
  
 
==GAGAN==
 
==GAGAN==
The [[GAGAN|GPS Aided Geo Augmented Navigation or GPS and Geo Augmented Navigation system (GAGAN)]] is the SBAS implementation by the Indian government. The Indian government states that it will use the experience of building the GAGAN system in the creation of an autonomous regional navigation system called the Indian Regional Navigational Satellite System (IRNSS).<ref name="GAGAN WIKI"/>
+
The [[GAGAN|GPS Aided Geo Augmented Navigation or GPS and Geo Augmented Navigation system (GAGAN)]] is the SBAS implementation by the Indian government. On 21 April 2015 it was certified for approach with vertical guidance (APV1) becoming the third SBAS in the world to achieve it and the first to do so operating in the equatorial region.<ref>[https://www.icao.int/APAC/APAC-RSO/GBASSBAS%20Implementation%20Workshop/3-7_GAGAN_Regional_Service_Availability%20(T%20Schemmp).pdf GAGAN Regional Service Availability]</ref><ref name="DGCA"/> It broadcasts SBAS navigation data using L1 signals and it is under development to also use the L5 signal for SBAS data broadcast.
  
 
<gallery widths="200px">
 
<gallery widths="200px">
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The main differentiator of SDCM with respect to other SBAS systems is that it is conceived as an SBAS augmentation to GPS and GLONASS, whereas the rest of current SBAS initiatives provide corrections and integrity just to GPS satellites.
 
The main differentiator of SDCM with respect to other SBAS systems is that it is conceived as an SBAS augmentation to GPS and GLONASS, whereas the rest of current SBAS initiatives provide corrections and integrity just to GPS satellites.
  
<gallery widths="200px">
+
[[File:SDCM stations new.PNG|300px|SDCM planned station network|centre|thumb]]
Image:sdcm_overview.png|SDCM planned station network
 
</gallery>
 
  
 
==SNAS/BDSBAS==
 
==SNAS/BDSBAS==
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The program began in 2003 being at present in its Phase III which will determine the feasibility of the implementation of an own SBAS system in the CAR/SAM regions.
 
The program began in 2003 being at present in its Phase III which will determine the feasibility of the implementation of an own SBAS system in the CAR/SAM regions.
  
==ASECNA==
+
==A-SBAS==
ASECNA corresponds to the SBAS for Africa and Indian Ocean Development initiative. It is composed by international public organisations from 18 member states.
+
A-SBAS (ASECNA) corresponds to the SBAS for Africa and Indian Ocean Development initiative. It is composed by international public organisations from 18 member states.
  
ASENCA aims to provide early SBAS services from 2021/2022 for NPA, APV-1 and CAT-I operations. Full DFMC services are expected beyond 2028/2030 for CAT-I autoland operations and potentially further ones.
+
A-SBAS aims to provide early SBAS services from 2021/2022 for NPA, APV-1 and CAT-I operations. Full DFMC services are expected beyond 2028/2030 for CAT-I autoland operations and potentially further ones<ref name="ASECNAC">[https://egnos-user-support.essp-sas.eu/new_egnos_ops/sites/default/files/EWS19%20ASECNA%20-%20SBAS-ASECNA%20programme%20status.pdf ASECNA status]</ref>.
  
 
==KASS==
 
==KASS==
 
In October 2014, the Korea Aerospace Research Institute (KARI) was appointed as the leading research organization to develop and build Korea’s own Satellite Based Augmentation System (SBAS), known as KASS (Korea Augmentation Satellite System) in compliance with ICAO Annex 10.
 
In October 2014, the Korea Aerospace Research Institute (KARI) was appointed as the leading research organization to develop and build Korea’s own Satellite Based Augmentation System (SBAS), known as KASS (Korea Augmentation Satellite System) in compliance with ICAO Annex 10.
  
It is expected to provide APV-1 safety-of-life service to airports located in South Korea in 2022.
+
It is expected to provide APV-1 safety-of-life service to airports located in South Korea in 2022<ref name="KAAS">[https://egnos-user-support.essp-sas.eu/new_egnos_ops/sites/default/files/EWS19%20KARI%20-%20KASS%20programme%20status.pdf KAAS status (2019)]</ref>.
  
==SPAN==
+
==SouthPAN==
SPAN (Southern Positioning Augmentation Network) is the initiative jointly funded by Australia and New Zealand to develop a SBAS system.
+
SouthPAN (Southern Positioning Augmentation Network), formerly named as SPAN, is the initiative jointly funded by Australia and New Zealand to develop a SBAS system.
  
A first SBAS Test-Bed Demonstration trial and economic analysis has been completed, in which different companies (including Lockheed Martin and GMV) were involved. The operational system deployment is expected to start in a short term.
+
A first SBAS Test-Bed Demonstration trial and economic analysis has been completed, in which different companies (including Lockheed Martin and GMV) were involved. The operational system deployment is expected to start in a short term<ref name="SouthPAN_status">[https://www.unoosa.org/documents/pdf/icg/2019/icg14/07.pdf SouthPAN status]</ref>.
  
 
==References==
 
==References==

Revision as of 08:46, 22 September 2021


FundamentalsFundamentals
Title SBAS Systems
Edited by GMV
Level Basic
Year of Publication 2011
Logo GMV.png

SBAS systems are spreading out all over the world. More and more, it is believed that upon dual-frequency SBAS service provision, a seamless navigation will be possible from and to any two locations in the world.

SBAS in the World

SBAS Indicative Service Areas. Source: GSA User Technology Report 2020 [1]

From all the SBAS systems in the world, some of them are already operational (WAAS, MSAS/QZSS,GAGAN System, EGNOS), other are under implementation (SDCM, China’s Beidou SBAS BDSBAS, previously known as SNAS) while others are under feasibility studies, as is the case of SACCSA, A-SBAS (ASECNA) [2], KASS[3] in South Korea planned for 2022 or SouthPAN (Southern Positioning Augmentation Network) in Australia[4] and New Zealand.

According to the Interoperability Working Group (IWG) of SBAS System several evolutions are expected in the coming years:[5]

  • GNSS Dual Frequency Operations;
  • GNSS Multiple-Constellation Operations (Galileo, BeiDou);
  • EGNOS and MSAS reference network expansion;
  • SDCM and other SBAS systems under development to become operational.

When these evolutions are completed it is thought that the global SBAS coverage will suffer an increase from the 7.54% at 99% (only WAAS, EGNOS and MSAS) to 92.65%, considering the use of multiple-constellation (GPS and Galileo).

Prediction of World Wide SBAS coverage

WAAS

Waas logo.gif

The Wide Area Augmentation System (WAAS) was jointly developed by the United States Department of Transportation (DOT) and the Federal Aviation Administration (FAA), beginning in 1994, to provide performance comparable to category I instrument landing system (ILS) for all aircraft possessing the appropriately certified equipment.[6]

On July 10, 2003, the WAAS signal was activated for safety-of-life aviation, covering 95% of the United States, and portions of Alaska.[6] At present, WAAS supports en-route, terminal and approach operations down to a full LPV-200 (CAT-I like Approach Capability) for the CONUS, Mexico and Canada.

The WAAS programme is continuously in evolution; three development phases have been already covered, and there are on-going plans to improve the capability of the system in parallel with the evolution of the SBAS standards towards a dual-frequency augmentation service.[7]

EGNOS

EGNOS (European Geostationary Navigation Overlay Service) is the European SBAS system that complements the existing satellite navigation services provided by the US Global Positioning System (GPS). EGNOS constitutes together with Galileo the two major initiatives in Europe in terms of satellite navigation. Future evolutions such as EGNOS V3 are expected to augment both GPS and Galileo constellation data.

EGNOS currently supports the following services:[8]

  • The Open Service (OS), freely available to the public over Europe. This service was officially started on 1 October 2009.
  • The Safety of Life Service (SoL), that provides the most stringent level of signal-in-space performance to all communities of Safety of Life users over Europe. This service was officially started on 2 March 2011.
  • The EGNOS Data Access System (EDAS) represents the provision of additional data for professional users not provided by the EGNOS signal broadcast by geostationary satellites but by other distribution channels.

MSAS/QZSS

The Multi-functional Satellite Augmentation System (MSAS) is the Japanese SBAS. NEC manufactured and delivered MSAS under contract with the Civil Aviation Bureau, Ministry of Land, Infrastructure, Transport and Tourism.

MSAS is operational since 2007 supporting en-route, terminal and non-precision approach operations (RNP 0.1). Recently has completed successful LPV flight trials augmenting GPS L1 signals.

QZSS (Quasi-Zenith Satellite System) is the Japanese satellite navigation program with a regional service coverage based on orbits for quasi-zenith satellites to broadcast radio signals from high elevation angle into urban canyons. MSAS evolutions will take advantage of the Japanese QZSS and to include DFMC capabilities in the future[9].

GAGAN

The GPS Aided Geo Augmented Navigation or GPS and Geo Augmented Navigation system (GAGAN) is the SBAS implementation by the Indian government. On 21 April 2015 it was certified for approach with vertical guidance (APV1) becoming the third SBAS in the world to achieve it and the first to do so operating in the equatorial region.[10][11] It broadcasts SBAS navigation data using L1 signals and it is under development to also use the L5 signal for SBAS data broadcast.

SDCM

The System for Differential Corrections and Monitoring (SDCM) is the SBAS currently being developed in the Russian Federation. SDCM is expected to be certified in the coming years, being this just the first step in the SDCM strategy which pursues also other broadcast means –potentially a polar MEO– with the aim of providing also a service to the North part of Russia.

The main differentiator of SDCM with respect to other SBAS systems is that it is conceived as an SBAS augmentation to GPS and GLONASS, whereas the rest of current SBAS initiatives provide corrections and integrity just to GPS satellites.

SDCM planned station network

SNAS/BDSBAS

The People's Republic of China is developing its own SBAS, called Satellite Navigation Augmentation System (SNAS). There is little public information available on this development.

Now, the Chinese SBAS initiatives refer to BeiDou Satellite-based Augmentation System (BDSBAS).

BDSBAS Architecture. Source: Springer Open [13]

SACCSA

The SBAS initiative in South/Central America and the Caribbean is called SACCSA (Soluciόn de Aumentaciόn para Caribe, Centro y Sudamérica). SACCSA is an ICAO project founded by the Participants/Member States of the SACCSA Project: Argentina, Bolivia, Colombia, Costa Rica, Guatemala, Panama, Spain, Venezuela and COCESNA (Corporación Centroamerica de Servicios de Navegación Aérea). The objective is to study the improvement of the Air Navigation Environment in the Caribbean and South America (CAR/SAM) Regions with a SBAS solution. The program began in 2003 being at present in its Phase III which will determine the feasibility of the implementation of an own SBAS system in the CAR/SAM regions.

A-SBAS

A-SBAS (ASECNA) corresponds to the SBAS for Africa and Indian Ocean Development initiative. It is composed by international public organisations from 18 member states.

A-SBAS aims to provide early SBAS services from 2021/2022 for NPA, APV-1 and CAT-I operations. Full DFMC services are expected beyond 2028/2030 for CAT-I autoland operations and potentially further ones[2].

KASS

In October 2014, the Korea Aerospace Research Institute (KARI) was appointed as the leading research organization to develop and build Korea’s own Satellite Based Augmentation System (SBAS), known as KASS (Korea Augmentation Satellite System) in compliance with ICAO Annex 10.

It is expected to provide APV-1 safety-of-life service to airports located in South Korea in 2022[3].

SouthPAN

SouthPAN (Southern Positioning Augmentation Network), formerly named as SPAN, is the initiative jointly funded by Australia and New Zealand to develop a SBAS system.

A first SBAS Test-Bed Demonstration trial and economic analysis has been completed, in which different companies (including Lockheed Martin and GMV) were involved. The operational system deployment is expected to start in a short term[14].

References