Every Beidou navigation satellite has a lifetime. The service life of satellites is generally around 10 years, and some are shorter, ranging from 2 to 3 years. The earliest launched Beidou was nearly 20 years ago, and its effective life has passed, so it should be replenished frequently.
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Development history
China attaches great importance to the construction and development of Beidou system, and has been exploring the development path of satellite navigation system suitable for China's national conditions since 1980s, forming a "three-step" development strategy:
The first step is to build Beidou-1 system. 1994, started the construction of Beidou-1 system; In 2000, two geostationary orbit satellites were launched, and the system was completed and put into use. Active positioning system is adopted to provide positioning, timing, wide area differential and short message communication services for China users. In 2003, the third geostationary orbit satellite was launched to further improve the system performance.
The second step is to build Beidou-2 system. In 2004, the construction of Beidou II system was started; By the end of 20 12, a total of 4 networking satellites (5 geostationary orbit satellites, 5 tilted geosynchronous orbit satellites and 4 medium earth orbit satellites) had been launched. On the basis of compatibility with Beidou-1 system, Beidou-2 system adds a passive positioning system to provide positioning, speed measurement, time service and short message communication services for users in the Asia-Pacific region.
The third step is to build the Beidou-3 system. In 2009, the Beidou-3 system was started; By the end of 20 18, launch 19 satellites, complete the basic system construction and provide services to the world; It is planned that by the end of 2020, 30 satellite launch networks will be built and the Beidou-3 system will be built in an all-round way.
Baidu Encyclopedia-Beidou System