So far, Beidou system has basically covered Chinas smart phone market.
This is not surprising. After all, the current strength of Beidou can not be ignored.
Beidou satellite system is the third mature global satellite navigation system independently developed by China, following GPS of the United States and GLONASS of Russia. It is also one of the suppliers recognized by the United Nations satellite navigation Committee.
Although Beidou is now on an equal footing with other global satellite navigation systems, Chinas satellite system was only small and transparent more than 20 years ago, and it needed to rely on other countries positioning systems, such as GPS.
Since 1958, the United States began to develop satellite positioning system, which cost US $30 billion. Finally, GPS was built and opened to the world for civilian use. However, the military part is still in its own hands.
At that time, outside China, many countries in the world were also using GPS. As the owner of technological achievements, the United States holds absolute control and can even rise to hegemony at some times. For example, at the time of the Galactic event.
In 1993, the United States claimed that the Chinese Yinhe cargo ship bound for Abas port, Iran, was carrying precursor chemicals for the manufacture of chemical weapons and intercepted in the high seas of the Indian Ocean and asked to be boarded for inspection. Even before the Chinese side responded, the US side directly cut off the GPS signal of the cargo ship. For a time, the galaxy lost its direction at sea and was unable to move.
Sha Zukang, then deputy director general of the International Department of the Ministry of foreign affairs, said in retrospect that the discomfort of being stuck in the neck made the Chinese people more aware of the importance of building satellite systems.
It is worth mentioning that before the galaxy incident, the United States used GPS in the Gulf War and achieved great results in the military, known as the multiplier of military power, which made all countries including China realize that they must establish their own GPS.
The reason for saying finally is that this is not the first attempt of China in satellite system; the lighthouse project in 1967 and the double satellite positioning scheme proposed by Chen Fangyun and other experts and scholars in 1983 are all aimed at satellite construction.
But these plans were not fruitless or suspended. Although the economic conditions were very limited in the light of the background, they were still not paid enough attention.
Although there is no brilliant research results, the three-step development strategy of Beidou system was established in the 1980su2014u2014
Beidou-1: Test and verify the system, providing services to China;
Beidou-2: regional navigation and positioning system, providing services to the Asia Pacific region;
Beidou-3: global navigation and positioning system, providing services to the world.
There are many difficulties
Chinas construction of Beidou No.1 has no experience, no money, little scientific research equipment and poor research and development environment. Whats worse is the technological blockade of western countries.
However, this method of cutting roots in the bud did not work. With the dedicated efforts of engineers, China launched two geostationary satellites in 2000, and then launched again in 2003. The Beidou-1 system was completed.
Beidou-1 has solved the problem of whether Chinas autonomous satellite navigation system exists or not, and has taken the first step in satellite construction. Along with the success comes the further technological blockade of western countries.
Xie Jun said that during the construction of beidou-2, it was obvious that foreign countries were bargaining on some products, or that they did not provide the required technical indicators.
In addition to solving the technical difficulties, China also needs to compete with the European Union for satellite navigation frequency bands.
The golden band has been occupied by the United States and Russia for a long time. However, countries have to apply for competition for a small number of frequencies. The competition rules are first come, first served formulated by western countries, that is, who goes to heaven first is the one.
In addition, according to ITUs seven-year limit application rules, China needs to launch satellites before April 17, 2007, otherwise the application will be invalid.
On the one hand, it is the external technical blockade; on the other hand, the internal time is pressing. The Beidou team can only fight against difficulties and race against time.
Finally, in April 2007, the first navigation satellite of beidou-2 system was ready to be launched. However, the Beidou team found that the satellite transponder was abnormal during the third general inspection.
The cut-off time is approaching, but if the fault is not eliminated, it is impossible to prove the realization of frequency transmission. Finally, the Beidou team decided to race against time again to take out the transponder and repair it.
Yang Changfeng, chief designer of Beidou project, recalled.
At 4:00 on April 14, 2007, the beidou-2 satellite took off smoothly. At about 20:00 on April 16, the satellite sent back the signal, which was less than four hours away from the ITUs seven-year limit.
Beidou core is China core
With the acquisition of satellite frequency band, the beidou-2 system has been successfully deployed. The three-step of Beidou construction has gone two-thirds. To achieve the ultimate goal, the final step is very important, which determines whether Chinas Beidou can move from region to the world.
With the U.S. GPS blockade and the lessons learned from the cooperative development of Galileo system, China is more clear about one thing - independence! independent! independent!
Lin Baojun said in an interview.
However, the inter satellite link increases the amount of satellite computing, and the chip becomes the top priority.
In the past, the European sc80c32 chip used in satellites has been difficult to meet the requirements of higher computing power and lower error rate. Although there are chips in China, they have not been tested.
Under the balance, the Beidou team finally chose the unknown domestic Loongson. Later facts have also proved that the domestic Loongson not only meets the requirements of computing power, but also can ensure the normal operation of the satellite even in the harsh space environment.
Domestic is not bad, domestic is not unreliable, Beidou chips are the same level as foreign countries, they are all made by ourselves, the ground is completely Chinese chip... After the completion of Beidou No.3, engineers are confident.
In view of the current not so peaceful international situation, although it will affect the internationalization of Beidou, there is no so-called neck jam for Beidou satellite.
On June 23, 2020, the last global networking satellite of beidou-3 was launched, and the deployment of beidou-3 global satellite navigation system Constellation was fully completed.
This time is half a year ahead of the original plan. It takes three years and three months to deploy the 12 networking satellites of beidou-3, but its achievements have achieved the leap from gps2 to GPS320 years ago in the United States.
These are the rewards of Beidou teams research day and night.
Such a scene is aptly interpreted as: where is there any casual success? Its just sticking to it.
Now, in terms of coverage, the Beidou system is on par with GPS, but this is not the end point. Lin Baojun said:
But the fight for number one is not to show off, but to provide better servicesu2014u2014
And this is the real great power style.
The best portrayal of domestic substitution
From the end of the last century to the end of the last century, Chinas Beidou attitude has taken 26 years from catching up, running together, and then surpassing. The process is full of bitterness.
Similar experiences are being repeated in semiconductor and mobile phone industries in the 21st century.
Chinas Beidou, has given the best proof.
What it reflects is not only the mark of the times, but also Chinas fearlessness and tenacity in seeking independence.
The real power is always tempered; the real strength is not conquering, but sharing.
Source of this article: Lei feng.com Author: Xiao man, editor in charge: Mao Xinsi_ NBJS11624