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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), or 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.
The system has evolved 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. The long-term goal is to develop an independent global navigation satellite network similar to the GPS and GLONASS.[1]
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:[2]
- Positioning: 100m (1σ); 20m(1σ, with reference stations).
- Regional Service short message service (SMS): up to 120 Chinese characters.
- Timing: 20ns
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 fourth and also the last satellite of BeiDou-1 system, the BeiDou-1D was put into orbit, and after suffering from a control system malfunction, it was fully restored by the end of 2007. Then, the open service performances reached the levels described before.[3][4]
The global COMPASS system will be built by 2020. The peformances for the two global services would be:[2]
- 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;
- Authorized service:a licensed service with higher accuracy even in complex situations for authorised and military users only.
The performances for the two kinds of regional services (over China and neighboring areas):[2]
- Wide area differential positioning service: with positioning accuracy of 1 m.
- Short message service (SMS): up to 120 Chinese characters.
Initially the COMPASS system has initially provide the regional services covering China and its neighbouring countries in 2008, and it will eventually extend into a global navigation satellite system, providing the corresponding global services by 2020.
Notes
References
- ^ Compass on the Chinese Defence Today website
- ^ a b c Compass/BeiuDou status presentation in Rome (Italy), June 11, 2009.
- ^ Beidou Navigation System in Wikipedia
- ^ COMPASS Navigation system in Wikipedia