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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), 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]
History
According to the China National Space Administration, the development of the Chinese global navigation system should be carried out in three steps:
- 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 [2][3]. 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.
COMPASS Services
The COMPASS system will provide two types of services: [1]
- 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 50 nanoseconds;
- 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.