At 9:43 on June 23, China successfully launched the last networking satellite of beidou-3 global navigation satellite system at Xichang Satellite Launch Center! So far, all 30 beidou-3 networking satellites have been put in place, and beidou-3 global satellite navigation system Constellation deployment has been fully completed.
This means that China's Beidou will be able to provide global users with basic navigation, global short message communication, international search and rescue services.
Make sure you have your own navigation
In the past, before the construction of Beidou System in our country, GPS almost became the pronoun of navigation. Whether you are driving or looking at a map, you can't do without the data provided by GPS.
The core of navigation is positioning and timing, which is an essential information technology for human to engage in political, economic and military activities. Just imagine that if the benchmark information of a country's time and space is all provided by others, then the military, communications and finance will face great risks.
For example, in the military, navigation is mainly used for army maneuver, weapon launch, border patrol and life rescue. This requires that the status information such as the position, speed and posture of the carrier must be provided in real time during the navigation process. If these information deviate, it is equivalent to that the weapon equipment has no eyes and the army has lost its direction.
Today, with the development of human life, the requirements of navigation are higher and higher. For example, the current hot new infrastructure is inseparable from the data support of time benchmark and spatial location benchmark. It can be said that Beidou navigation system is the infrastructure of the new infrastructure and the foundation of the foundation. For example, with the support of scientific and technological forces such as Beidou system, we can build intelligent forest fire prevention and extinguishing infrastructure. Based on the high-precision positioning and navigation service of Beidou system, large-scale, heavy-duty, long-distance, intelligent and whole system fire-fighting unmanned helicopter can quickly and accurately arrive at the fire scene, and make full use of Beidou system and its short message communication function to serve as fire brigade Personnel provide important information such as location sharing to realize on-site digital command.
Another example is that many domestic automobile factories have been extensively researching and developing the intelligent network connection technology of automobiles, with the purpose of making people, cars and roads "speak up". For example, the application of Chihiro position in automatic driving has reached the vehicle specification level mass production capacity. It can provide accurate, reliable and safe high-precision space-time absolute benchmark for l2.5-class highway automatic cruise, L3 class high-speed automatic driving, or L4 class autonomous parking in specific scenes. In the future, we can make use of the latest perception monitoring technologies such as visual perception and Beidou system to make the driving vehicles perceive the main body of the road, structures and facilities along the road in real time, so as to realize the gradual integration and collaborative work of vehicles and roads, so that the vehicles can automatically sense the road conditions in the process of driving.
Beidou No.3 is more excellent
As the saying goes, the waves behind the Yangtze River push the waves ahead, and each generation is stronger than the other. As the "back wave" in the big game of Beidou, beidou-3 is not just a matter of launching more satellites and expanding its service area. As the last step of the "three-step" strategy of China's satellite navigation system construction, beidou-3 is not a simple iterative update, but a huge historical leap forward. Not only will the navigation service expand to the whole world, but also the special services such as short message communication will be more powerful, and the positioning accuracy will also catch up with GPS.
Short message communication is a unique skill of Beidou system, which means that the two-way short digital message communication can be realized between users and users, users and central control system of Beidou. In the beidou-3 system, the short message communication ability has been significantly improved, and the information transmission ability has been improved from 120 Chinese characters at the first time to 1200 Chinese characters at a time. It is not too much to call it long message. In the future, when users encounter unexpected situations, they don't need to think about words, which is enough to make the plot clear at one time, and can also send pictures and other information, so that the application scenarios are more abundant.
In order to improve the service accuracy, the beidou-3 system is also equipped with a new generation of atomic clocks. Atomic clocks use the characteristics of stable atomic transition frequency to ensure the accuracy of generation time. At present, there are mainly rubidium atomic clocks, hydrogen atomic clocks and cesium atomic clocks in the world. China's Beidou satellite adopts rubidium atomic clock, and is equipped with a newly developed domestic hydrogen atomic clock with higher performance. Although the mass and power consumption of hydrogen atomic clock are larger than rubidium atomic clock, its stability and drift rate are better. The on orbit application of the satellite borne hydrogen atomic clock plays an important role in realizing the accuracy of Beidou navigation and positioning.
In order to improve the reliability of the satellite in orbit service, beidou-3 satellite has also taken a number of reliability measures, so that the design life of the satellite can reach 12 years, reaching the advanced level of international navigation satellite, providing the basic guarantee for the continuous and stable service of Beidou system.
In the future, Beidou system will design a satellite on orbit technical support platform with integrated intelligent management of "space, ground and use" by using massive data such as on orbit satellite, ground and user evaluation, which has the capabilities of multi-source reception, independent monitoring, intelligent diagnosis, process visualization and rapid evaluation. Ensure the continuous and stable operation of Beidou satellite navigation system and provide high-precision positioning navigation and time service for global users. (Economic Daily - China economic network reporter Jiang Tianjiao)
Big events of Beidou
In 1994, Beidou-1 system project was established,
In 2003, Beidou-1 system was completed, and China became the third country with independent satellite navigation after the United States and Russia