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{{Article Infobox2
{{Article Infobox2
|Category=COMPASS
|Category=COMPASS
|Title={{PAGENAME}}
|Authors=GMV
|Authors=GMV
|Level=Basic
|Level=Basic
|YearOfPublication=2011
|YearOfPublication=2011
|Logo=GMV
|Logo=GMV
|Title={{PAGENAME}}
}}
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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>
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>


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[[File:Beidou_navigation_system.png‎|COMPASS Logo|200px|thumb]]
[[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 COMPASS supports both global worldwide services and regional services.
*initial passive positioning navigation;
 
*timing service;
 
*and short message communication (120 Chinese characters per message) service.
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>:
* 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 20 ns and a velocity accuracy of 0.2 meters per second.
* 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 COMPASS 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>”Analysis of the GNSS Augmentation Technology Architecture”, J. Chen, Beijing Global Information Center of Application and Exploitation, Sep 2011, ION GNSS 2011.</ref>.
* Short message service
Short message service, also called Positioning Report Service, is already 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 may evolve to longer messages and not limited to position report.


==Notes==
==Notes==

Revision as of 14:41, 22 November 2011


COMPASSCOMPASS
Title BeiDou Services
Author(s) GMV
Level Basic
Year of Publication 2011
Logo GMV.png

The Compass Navigation Satellite System (CNSS), also named BeiDou-2,[1] 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.[1][2]

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.[1] The system is currently under development evolving from a regional system called BeiDou-1, and in the first phase will provide high-accuracy positioning services for users in China and its neighboring regions by 2012.[1] In a second stage, the system will evolve to provide global navigation services by 2020, similarly to the GPS, GLONASS or Galileo systems.[1]

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.[1][3][4]


COMPASS Services

COMPASS Logo

The COMPASS supports both global worldwide services and regional services.


The global services can be further sub-divided in two other services[5]:

  • 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 20 ns and a velocity accuracy of 0.2 meters per second.

  • 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 COMPASS 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].

  • Short message service

Short message service, also called Positioning Report Service, is already 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 may evolve to longer messages and not limited to position report.

Notes

References

  1. ^ a b c d e f Compass Satellite Navigation System (Beidou), on Sinodefence.com, updated on August 6th, 2011.
  2. ^ COMPASS Navigation system in Wikipedia
  3. ^ China Satellite Navigation Office, Development of BeiDou Navigation Satellite System, Munich Satellite Navigation Summit, 2011.
  4. ^ China completes basic Beidou (Compass) Navigation Satellite System, 2011-04-10 by Globaltimes.cn
  5. ^ ”Development of BeiDou Navigation Satellite System”, China Satellite Navigation Office, Sep 2011, ION GNSS 2011.
  6. ^ ”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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