China's Beidou satellite navigation system has five points superior to the U.S. GPS
1. Beidou navigation supports sending and receiving short text messages, while GPS only supports receiving positioning information.
BeiDou can send 40 Chinese characters at one time to the terminal in the global scope, and the regional communication ability reaches 1000 Chinese characters each time, including pictures, videos, texts, etc. This two-way communication ability is of great use in aviation and navigation in case of distress.
2. Positioning accuracy
U.S. GPS civil (free) accuracy is “ in 95% of the cases the accuracy can reach 7.8 meters ”, generally in the global indicator is within 10 meters, of course, in our actual use, will find that most of the accuracy between 5-10 meters.
And our Beidou global measured positioning accuracy average value of 2.34 meters, speed accuracy better than 0.2 m / s, timing accuracy better than 20 nanoseconds, service availability better than 99%, in the Asia-Pacific region performance is better (positioning accuracy will be better than 5 meters).
It can be seen that in terms of civil accuracy, Beidou system is already higher than GPS system. However, the U.S. GPS is able to reach the accuracy of 1 meter or less in the military, and the lowest is 0.2 meter, but it is not open to the public, so the U.S. GPS system in the military is better in terms of accuracy.
3. BeiDou system can realize two-way communication, the U.S. GPS is a one-way communication satellite.
The American GPS system can only send signals from the satellite to the terminal, and the terminal can't transmit signals to the satellite, but China's BeiDou system satellites are able to send signals to the terminal, and the terminal is also able to send signals to the satellite.
4. Number of Satellites
U.S. GPS covers the globe and maintains the operation of only 24 satellites, although there are still 4, but only as a backup, only emergencies will be put to use, on the contrary, China's Beidou system, the last Beidou satellite in 2020, that is, the 55th Beidou satellite was officially lifted off the ground, only to mark China & ldquo; Beidou III & rdquo; Satellite Positioning System is fully completed.
5. System completion time
GPS global positioning system first originated in the United States military a project, completed in 1994, and Beidou in 2020 to complete a comprehensive network, 26 years later than GPS.
Although from the current point of view, Beidou can meet the needs of more users, but Beidou navigation system to completely replace GPS may still need some time.
