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BeiDou Services
| COMPASS | |
|---|---|
| Title | BeiDou Services |
| 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 Services
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]. 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 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
- ^ a b c d e f Compass Satellite Navigation System (Beidou), on Sinodefence.com, updated on August 6th, 2011.
- ^ COMPASS Navigation system in Wikipedia
- ^ China Satellite Navigation Office, Development of BeiDou Navigation Satellite System, Munich Satellite Navigation Summit, 2011.
- ^ China completes basic Beidou (Compass) Navigation Satellite System, 2011-04-10 by Globaltimes.cn
- ^ ”Development of BeiDou Navigation Satellite System”, China Satellite Navigation Office, Sep 2011, ION GNSS 2011.
- ^ a b ”Analysis of the GNSS Augmentation Technology Architecture”, J. Chen, Beijing Global Information Center of Application and Exploitation, Sep 2011, ION GNSS 2011.