Due to one thing, the construction of Beidou II was almost died, and he was deeply tingling ...

From the successful launch of the first test satellite in Beidou -1 in October 2000, by June 23, 2020, the last global networking satellite in Beidou III was upgraded. In the past 20 years, 44 launches, China will have 4 Beidou tests. Satellites, 55 Beidou No. 2 and No. 3 network satellites were sent to space, opening up the era of "Starnet" navigation in China.

Recently, Xie Jun, the chief designer of Beidou 3 navigation satellite in "Face", tells the story behind Beidou Satellite.

Three years of overcome technical problems

Only 2 hours left at the deadline for the launch of successful launch

In 2004, Beidou II satellite navigation system officially established items. Xie Jun, who has already developed 22 years of work experience and has participated in multiple major projects, has served as the chief designer of the Beidou 2nd satellite system. He recalled, "From 2004 to 2007, this may be the most difficult period for my chief teacher."

Beidou II satellite navigation system is based on Beidou -1, from the original only to provide services to China to expand to cover the Asia -Pacific region. 14 satellite support is required, and some basic problems must be overcome.

However, according to the International Electric Power Union regulations, the frequency resources and orbital position resources of navigation satellites are 7 years from the date of application, and no timeout is used to be automatically used. This means that he and the team have only three years of breaking basic problems and send satellites to space before April 17, 2007.

In the early morning of April 14, 2007, the first mid -circuit test satellite in the Beidou II system was successfully sent to space. But this is a key action away from the provisions of the International Electric Federation.

Xie Jun: Not only should you send the satellite up, but also the radio signal carried by the satellite to the ground and receive the signal. Before the satellite's microwave components, some tide may be carried on the ground, and it has not been released. A microwave phenomenon may generate discharge, which will abode the surface of the device, which may affect the function of the product.

At 20:14 on April 16, 2007, Xie Jun made a decision to order the effective load product on the test satellite to power up. After 1 hour and 32 minutes, the ground system received the navigation signal of satellite broadcast correctly. At this moment, it was only 2 hours before the space frequency application specified in the International Electric Federation.

Xie Jun said that this was a risky and successful decision. "I think there is a certain lucky component. We must have the courage to take responsibility, but it is not simple blind, or a lot of ground experimental data support."

Imported atomic clocks cannot be supplied on time

They produce China's own atomic clock

From 2004 to 2012, the positioning accuracy of the Beidou II satellite navigation system was increased from 20 meters to 30 meters from Beidou -1 to 10 meters at a level and high range, close to the GPS civilian standards at that time.

The improvement of positioning accuracy requires the support of multiple key technologies and components on satellites, which includes atomic clocks known as "navigation satellite heart".

In 2006, because the imported atomic clock could not be supplied on time, the construction project of Beidou 2 was almost died. He realized that as a big space country, China must have an independent time -frequency benchmark system, which requires breaking through the technical difficulty of the atomic clock.

Xie Jun: When the project is settled, how can I think this thing is completed? Several of our units were very difficult to make atomic clocks in Beidou II. When we need to deliver the atomic clock when we need to deliver the atomic clock, we often hurry up and climb up. We cannot deliver on time.

At that time, the first -star atomic product developed at the Star Bell often jumped in the work and was poor. Xie Jun's own profession is not studying atomic clocks. He can only soak on the first line and analyze the problems with experts who develop the atomic clock. He tried to overcome difficulties. Three years later, they crossed the atomic clock.

The current accuracy of the atomic bell in Beidou Satellite is equivalent to only 1 second of 3 million years, which has reached the international first -class level.

"Contribute to the major project of the country

Be sure to do your job well ""

After completing the construction of the Beidou II system, Xie Jun began to serve as Deputy Chief Chief Designer of Beidou III Engineering Deputy Chief Chief Designer. During this period, Xie Jun worked continuously for a long time and fainted at the satellite launch scene three times. After waking up, he immediately rushed back to his post.

Xie Jun recalled, "One year on New Year's Eve, we are in the unit. Everyone eats dumplings in the cafeteria. No one is eating and eating. I will go back to test again."

Xie Jun: The process is not easy, but everyone feels that they can contribute to the country's major projects. They must do their job well.

On June 23, 2020, the last network satellite of Beidou III was successfully lift off, and Beidou Global Networking was completed. The localization rate of all stand -alone single -machine Satellite Satellite No. 3 has increased from 80%to 100%, which has made China the third country in the world with the global satellite navigation system after the United States and Russia.

At the same time, Xie Jun and the team launched a demonstration of the construction and development system of the next generation of Beidou system, and began key technologies. By 2035, they would design and build a northern -fighting system as the core national comprehensive timing navigation positioning system.

Xie Jun: Now it is basically within a range of 1,000 kilometers above the surface and the surface of the surface allows users to get a good navigation positioning time service. The next system must solve higher space.In terms of positioning accuracy, it is necessary to solve the navigation needs such as autonomous driving that everyone is expected now.More content, click Video ↓↓↓

央 Source of this article: CCTV News WeChat public account (ID: CCTVNewscenter) Comprehensive "Facial"

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