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{{Article Infobox2
{{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 Navigation Satellite System (CNSS), also named BeiDou-2, is China’s second-generation satellite navigation system capable of providing positioning, navigation, and timing services to users on a continuous worldwide basis.
On November 2, 2006, China announced the 2nd generation Chinese navigation system, COMPASS<ref>[http://en.wikipedia.org/wiki/Compass_navigation_system COMPASS Navigation system in Wikipedia]</ref>. 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 neighbouring regions. As of April 2011, eight satellites for Compass have been launched. According to an official report<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>, " ''the eighth Beidou/Compass satellite marks the completion of basic function of Beidou (Compass) Navigation Satellite System'' " .
The long-term goal is to develop an independent ''global'' navigation satellite system similar to the GPS and GLONASS.<ref name=Chinese_today>[http://www.sinodefence.com/space/spacecraft/beidou2.asp Compass on the Chinese Defence Today website] </ref>
==History==
According to the China National Space Administration, the development of the Chinese global navigation system should be carried out in three steps:
[[File:Beidou_navigation_system.png‎|COMPASS Logo|200px|thumb]]
*2000 - 2003: experimental BeiDou navigation system consisting of 3 satellites;
*by 2012: regional BeiDou navigation system covering China and neighboring regions;
*by 2020: global BeiDou navigation system, or Compass Navigation system.


In May 2003, the successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system. On November 2, 2006, China announced that from 2008 BeiDou would offer an open service with an accuracy of 10 meters, timing of 0.2 nanoseconds, speed of 0.2 meter/second. It followed that in February 2007, the last satellite of BeiDou-1 system, BeiDou-1D, was put into orbit, and after suffering from a control system malfunction, it was fully restored by the end of 2007 <ref>[http://en.wikipedia.org/wiki/Beidou_navigation_system Beidou Navigation System in Wikipedia]</ref><ref>[http://en.wikipedia.org/wiki/Compass_navigation_system COMPASS Navigation system in Wikipedia]</ref>. At this step, the BeiDou-1 regional system was completed, providing an "open" level of service, with 10-metre accuracy, in addition to its encrypted military service. The completion of the global system COMPASS is on-going, offering also an open service and an "authorized" service.
==BeiDou Services==
[[File:Beidou_navigation_system.png‎|BeiDou Logo|200px|thumb]]


==COMPASS Services==
The BeiDou supports both global worldwide services and regional services.


The COMPASS system will provide two types of services:<ref name='Compass_Munich'>''COMPASS Status Presentation'', Munich Satellite Navigation Summit March 2011.</ref>


* '''Open service''': a free service for civilian users with positioning accuracy of within 10 metres, velocity accuracy of within 0.2 m/s and timing accuracy of within 20 nanoseconds;
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 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>.
* Authorized Service
The authorized service aims at ensuring high reliable use even in complex situations and there is little information about it.


* '''Authorized service''':a licensed service with higher accuracy even in complex situations for authorised and military users only.


Initially the system will initially cover China and its neighbouring countries only, but will eventually extend into a global navigation satellite system by 2020.
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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