BeiDou Navigation System is China's self-developed global satellite navigation system, which is the third mature satellite navigation system after the U.S. GPS system and the Russian GLONASS system. The system consists of space satellites, ground center stations and user terminals, and its coverage area includes the Chinese mainland and its coasts, Taiwan, Nansha and other islands, the Sea of Japan, part of the Pacific Ocean and some neighboring areas.

BeiDou satellite navigation system can provide all-weather, high-precision, wide range of real-time positioning services for users in the service area, and its positioning accuracy is generally tens of meters. If differential positioning technology is adopted, the positioning accuracy in key areas can be up to 10 m or less, and the accuracy of speed measurement is better than 0.2 m/s, which is basically close to the positioning level of the U.S. GPS system.

Expanded information:

BeiDou navigation system advantages

1, active positioning and passive positioning

Active positioning refers to the process of positioning The receiver sends position information to the satellite, while the passive positioning receiver does not need to send information to the satellite. In active positioning technology, as long as there are two satellites can be positioned, while the normal passive positioning situation at least four satellites to realize positioning. The superiority of active technology is reflected in certain circumstances where the environment is harsh and the search for satellites is poor.

2, short message communication service

This is China's unique technology, the so-called short message refers to the user terminal and the satellite through the satellite signals between the two-way information transfer, more suitable for emergency communications. 08 years when the Wenchuan earthquake, the only way to communicate in the earthquake area is the Beidou generation.

3, the territory monitoring

BeiDou 3 system pioneered the use of Ka band measurement type of interstellar link technology. This technology makes all the Beidou satellites into a large network, each star can "talk" between the distance can be measured, a star through the stars, the stars through, so that the accuracy of satellite positioning is greatly improved. In addition, each satellite's on-board atomic clock can be synchronized between the walk, improving the accuracy of the entire navigation system time synchronization.

Baidu Encyclopedia - Beidou Navigation System