Which is more accurate, GPS dual-frequency or Beidou triple-frequency?

Compared with GPS, Beidou navigation has advantages.

1, safe

2. Tri-frequency signal. Beidou uses three-frequency signals and GPS uses dual-frequency signals, which is Beidou's late-comer advantage.

3. Active positioning and passive positioning. Active positioning means that the receiver itself needs to transmit information and communicate with the satellite, while passive positioning does not.

4. Short message communication service. This is definitely an original function of China, which is very practical.

5. Domestic monitoring.

Satellite positioning system generally consists of three parts: space constellation part, ground monitoring part and user receiver part. Among them, the ground monitoring part consists of monitoring station, main control station and injection station. The GPS system has established five monitoring stations around the world.

6. Open it step by step. GPS can only be used after the whole system is built.

7, local strengthening, and gradually mature. Theoretically, the global positioning accuracy of GPS is equivalent. Beidou system has been specially strengthened for China and its surrounding areas, and the geometric conditions of domestic satellites are relatively good.

8. Positioning accuracy. "The positioning accuracy of Beidou system is improved from 25m level and 30m elevation to 10m level and 10m elevation, the speed measuring accuracy is improved from 0.4m per second to 0.2m, and the time receiving accuracy is better than 20ns. At present, the service performance of Beidou system in China and surrounding areas is equivalent to that of GPS. "