Why should China build its own Beidou satellite navigation system?

On June 365438+1October 365438+1October 2000, China's first navigation and positioning satellite "Beidou-1A" was successfully launched. So, do you know why China should set up its own satellite navigation system?

Satellite navigation system can provide users with all-weather, all-day and high-precision navigation, positioning and timing services on the surface and near-earth space, and it is an important infrastructure to expand human activities and promote social development. Global satellite navigation has become a veritable interdisciplinary, cross-industry, multi-functional and efficient comprehensive high-tech.

As an independent country, the establishment of satellite navigation, positioning and timing system in China is very important to ensure the normal operation of national economy and national defense security. A country must have its own independent coordinate system, and global satellite navigation is one of the most important means to determine this coordinate system. If you don't have your own navigation system, you must use foreign ones, and the reliability and safety are not guaranteed. In addition, the establishment of satellite navigation system can also show comprehensive national strength and strive for more voice in the world.

Therefore, since 1980s, China has been actively exploring satellite navigation systems suitable for China's national conditions. In 2000, China initially built the Beidou satellite navigation test system, becoming the third country in the world with an independent satellite navigation system after the United States and Russia. At present, China is independently building and operating the Beidou global satellite navigation system which is compatible with other satellite navigation systems in the world. Beidou Global Constellation consists of 35 satellites, of which 5 are geostationary orbit satellites, 3 are geosynchronous inclined orbit satellites and 27 are medium earth orbit satellites. By the end of 20 12 and 10, Beidou satellite navigation system has launched 16 satellites. On February 27th, 2065438+02, 2065438+02, Beidou satellite navigation system officially provided continuous celestial source positioning, navigation, timing and other services to most parts of the Asia-Pacific region.

The high-precision timing of Beidou system can be divided into one-way and two-way. The accuracy of one-way timing is100ns, and that of two-way timing is 20ns. This is the highest precision in the field of public high-precision timing. Different from the other three satellite navigation systems, Beidou satellite navigation system also provides special services of "source location" and "short message". The short message service is similar to that in Weibo, and each message can send 120 words.

Beidou belongs to both China and the world. Beidou satellite navigation system is expected to be fully completed by 2020, which will provide stable, reliable and high-quality navigation services for users all over the world, and work hand in hand with other navigation systems in the world to promote human civilization and social development.

BDG-MF-07 Beidou /GPS positioning communication terminal