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BeiDou Performances
| COMPASS | |
|---|---|
| Title | BeiDou Performances |
| Author(s) | GMV |
| Level | Basic |
| Year of Publication | 2011 |
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 Performances
In May 2003, the successful launch of BeiDou-1C also meant the establishment of the BeiDou-1 navigation system, providing navigation, communication and timing services for the greater China area. The system services and performance characteristics at this time (2003) were:[5]
- Positioning: 100m (1σ); 20m (1σ, with reference stations).
- Regional Service short message service (SMS): up to 120 Chinese characters.
- Timing: 20 ns.
On November 2, 2006, China announced the second generation Chinese navigation system, COMPASS, that in the completion of its first phase by 2012 would offer an open service with an accuracy of 10 meters, timing of 0.2 nanoseconds, speed of 0.2 meter/second. As of April 2011, eight satellites for COMPASS have been launched, and another 3 more satellites will be put in orbit in 2011, expecting by 2012 to complete the first phase of the system and then, the open service performances reached the levels described before. The global COMPASS system will be built by 2020.[4]
The performances for the two global services of COMPASS would be:[3][5]
- 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.
The performances for the two kinds of regional services (over China and neighboring areas):[3][5]
- Wide area differential positioning service: with positioning accuracy of 1 m.
- Short message service (SMS): up to 120 Chinese characters.
Notes
References
- ^ a b c d e f Compass Satellite Navigation System (Beidou), on Sinodefence.com, updated on August 6th, 2011.
- ^ COMPASS Navigation system in Wikipedia
- ^ a b c China Satellite Navigation Office, Development of BeiDou Navigation Satellite System, Munich Satellite Navigation Summit, 2011.
- ^ a b China completes basic Beidou (Compass) Navigation Satellite System, 2011-04-10 by Globaltimes.cn
- ^ a b c Jun Shen, COMPASS/Beidou-China’s GNSS, BNStarNavigation Technology & System, Inc., Rome, June 11th, 2009