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{{Article Infobox2
|Category=COMPASS
|Category=BEIDOU
|Title={{PAGENAME}}
|Editors=GMV
|Authors=GMV
|Level=Basic
|Level=Basic
|YearOfPublication=2011
|YearOfPublication=2011
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The [[BeiDou_General_Introduction|BeiDou Navigation Satellite System (BDS)]], also known as BeiDou-2<ref name=BDS_STATUS> Compass/BeiDou Status, Jun Shen, BNStar Navigation Technology & System, Inc., Rome (Italy), June 11, 2009</ref>, is China’s second-generation satellite navigation system<ref name=BDS_STATUS/><ref>[https://en.wikipedia.org/wiki/Beidou_Navigation_Satellite_System BeiDou Navigation Satellite System in Wikipedia]</ref> that will be capable of providing positioning, navigation, and timing services to users on a continuous worldwide basis<ref name=BDS_WORLDWIDE> [http://www.insidegnss.com BeiDou China’s Rapidly Emerging GNSS], InsideGNSS, May/June 2014</ref>.
Overall, the BeiDou system covers both regional and global services and it is being developed in an [[BeiDou_Future_and_Evolutions|incremental way]]. The deployment of the system started with the regional services (covering China and its neighbouring regions) and Full Operational Capability (FOC) is expected to be reached by 2020.


The [[COMPASS General Introduction|Compass Navigation Satellite System (CNSS)]], also named BeiDou-2,<ref name=Chinese_today>[http://www.sinodefence.com/space/satellite/compass-beidou2.asp Compass Satellite Navigation System (Beidou), on Sinodefence.com, updated on August 6th, 2011.] </ref> is China’s second-generation satellite navigation system that will be capable of providing positioning, navigation, and timing services to users on a continuous worldwide basis.<ref name=Chinese_today/><ref name=COMPASS_Wiki>[http://en.wikipedia.org/wiki/Compass_navigation_system COMPASS Navigation system in Wikipedia]</ref>
Although the upgrade of its regional navigation system towards a global solution started in 1997, the formal approval by the Government of the development and deployment of BeiDou-2/CNSS was done in 2004.<ref name=Chinese_today/> The system is currently under development evolving from a regional system called [[Other Regional Systems|BeiDou-1]], and in the first phase will provide high-accuracy positioning services for users in China and its neighboring regions by 2012.<ref name=Chinese_today/> In a second stage, the system will evolve to provide global navigation services by 2020, similarly to the [[GPS General Introduction|GPS]], [[GLONASS General Introduction|GLONASS]] or [[GALILEO General Introduction|Galileo]] systems.<ref name=Chinese_today/>


As of August 2011, nine satellites for Compass have been launched, the first eight of which completed the deployment foreseen for the first phase of BeiDou-2.<ref name=Chinese_today/><ref name=BEIDOU_MUNICH_2011>China Satellite Navigation Office, ''Development of BeiDou Navigation Satellite System'', Munich Satellite Navigation Summit, 2011.</ref><ref name="Compass-IGSO3">[http://business.globaltimes.cn/industries/2011-04/642763.html ''China completes basic Beidou (Compass) Navigation Satellite System''], 2011-04-10 by Globaltimes.cn</ref>
==BeiDou Services==
[[File:Beidou_navigation_system.png‎|BeiDou Logo|200px|thumb]]


The BeiDou supports both global worldwide services and regional services.


==COMPASS Services==
[[File:Beidou_navigation_system.png‎|COMPASS Logo|200px|thumb]]


By April 2011, the initial phase of COMPASS system has been completed with a constellation of 4 GEO satellites and 3 IGSO satellites. During 2011, the system is going to launch another 4 Beidou Navigation Satellites, providing for the whole Asia-Pacific region:<ref name=BEIDOU_MUNICH_2011/>
The global services can be further sub-divided in two other services<ref>”Development of BeiDou Navigation Satellite System”, China Satellite Navigation Office, Sep 2011, ION GNSS 2011.</ref>:
*initial passive positioning navigation;
* Open Service
*timing service;
The Open Service is similar to GPS and Galileo and it is free of charge and open to all users worldwide. Users are able to compute their navigation solution using the same principles as for GPS and Galileo and the system is designed to provide a position accuracy of 10 meters, a timing accuracy of 50 ns and a velocity accuracy of 0.2 meters per second<ref name=BDS_PERFO>[http://beidou.gov.cn/ BeiDou System, Open Service Performance Standard], China Satellite Navigation Office, Version 1.0, December 2013</ref>.
*and short message communication (120 Chinese characters per message) service.
* Authorized Service
The authorized service aims at ensuring high reliable use even in complex situations and there is little information about it.


The aim of the first phase (completion expected by end of 2012) is to provide two types of services:<ref name=BEIDOU_MUNICH_2011/>
* Open Service: a free service for civilian users with positioning accuracy of within 10 meters, velocity accuracy of within 0.2 m/s and timing accuracy of within 20 nanoseconds;
* Authorized Service: a licensed service with higher accuracy even in complex situations for authorized and military users only.


Although in this first phase the system will only cover China and its neighboring countries, the Compass system is scheduled to extend into a global navigation system by 2020, this implies a continuous improvement of performances around the world in order to provide a global, free, high quality, reliable service.
As far as regional services are concerned:
* Wide area differential services
These services are foreseen for BeiDou and advertised to reach one meter positioning accuracy. Wide Area Augmentation is supported by BeiDou regional system: 30 stations broadcasting corrections by GEO and providing Cat I service in 2012<ref name=ION>”Analysis of the GNSS Augmentation Technology Architecture”, J. Chen, Beijing Global Information Center of Application and Exploitation, Sep 2011, ION GNSS 2011.</ref>. The current status of China GNSS Augmentation system reported in 2011<ref name = ION/> includes 21 coast stations providing 5 meters service for near sea ships.
* Short message service
Short message service, also called Positioning Report Service, is supported by [[Other Regional Systems#BeiDou-1|BeiDou-1]] and consists in allowing the user and the station to exchange short messages (currently 120 Chinese characters per message). This service will probably be provided by BeiDou and may evolve to longer messages and not limited to position report.


==Notes==
<references group="footnotes"/>
==References==
==References==
<references/>
<references/>




[[Category:COMPASS]]
[[Category:BEIDOU]]

Latest revision as of 17:00, 26 August 2018


BEIDOUBEIDOU
Title BeiDou Services
Edited by GMV
Level Basic
Year of Publication 2011
Logo GMV.png

The BeiDou Navigation Satellite System (BDS), also known as BeiDou-2[1], is China’s second-generation satellite navigation system[1][2] that will be capable of providing positioning, navigation, and timing services to users on a continuous worldwide basis[3]. Overall, the BeiDou system covers both regional and global services and it is being developed in an incremental way. The deployment of the system started with the regional services (covering China and its neighbouring regions) and Full Operational Capability (FOC) is expected to be reached by 2020.


BeiDou Services

BeiDou Logo

The BeiDou supports both global worldwide services and regional services.


The global services can be further sub-divided in two other services[4]:

  • Open Service

The Open Service is similar to GPS and Galileo and it is free of charge and open to all users worldwide. Users are able to compute their navigation solution using the same principles as for GPS and Galileo and the system is designed to provide a position accuracy of 10 meters, a timing accuracy of 50 ns and a velocity accuracy of 0.2 meters per second[5].

  • Authorized Service

The authorized service aims at ensuring high reliable use even in complex situations and there is little information about it.


As far as regional services are concerned:

  • Wide area differential services

These services are foreseen for BeiDou and advertised to reach one meter positioning accuracy. Wide Area Augmentation is supported by BeiDou regional system: 30 stations broadcasting corrections by GEO and providing Cat I service in 2012[6]. The current status of China GNSS Augmentation system reported in 2011[6] includes 21 coast stations providing 5 meters service for near sea ships.

  • Short message service

Short message service, also called Positioning Report Service, is supported by BeiDou-1 and consists in allowing the user and the station to exchange short messages (currently 120 Chinese characters per message). This service will probably be provided by BeiDou and may evolve to longer messages and not limited to position report.

References

  1. ^ a b Compass/BeiDou Status, Jun Shen, BNStar Navigation Technology & System, Inc., Rome (Italy), June 11, 2009
  2. ^ BeiDou Navigation Satellite System in Wikipedia
  3. ^ BeiDou China’s Rapidly Emerging GNSS, InsideGNSS, May/June 2014
  4. ^ ”Development of BeiDou Navigation Satellite System”, China Satellite Navigation Office, Sep 2011, ION GNSS 2011.
  5. ^ BeiDou System, Open Service Performance Standard, China Satellite Navigation Office, Version 1.0, December 2013
  6. ^ a b ”Analysis of the GNSS Augmentation Technology Architecture”, J. Chen, Beijing Global Information Center of Application and Exploitation, Sep 2011, ION GNSS 2011.
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