How accurate is the Beidou 3 satellite? No more than 1/1000000000 seconds.

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 How accurate is the Beidou 3 satellite? No more than 1/1000000000 seconds.


Liu Jiaxing (left two) is reading the data with his colleagues

There is an appointment on Monday

Fu Yifei, a newspaper reporter from Pan Chen

In July 29th, the ninth and tenth satellites of the Big Dipper three were successfully launched. As the chief designer of Beidou No. 3 of the Fifth Academy of China Aerospace Science and Technology Group, Liu Jiaxing fell to the ground.

Carrying pressure to check the cause, determined to give everyone trouble.

He recalled that a year ago, his eyebrows didnt stretch like this.

On a summer evening in 2017, Liu Jiaxing lay on his desk, his brows tightened, his temples kneaded, and he stared at a report, pondering.

This is an abnormality report on a key single test of the ninth satellite of Beidou three, which shows that the PN code phase consistency index of the single machine exceeds less than one nanosecond at the whole star test stage.

What is the concept of a nanosecond or 1/1000000000 seconds? In life, it has no concept. Even for most of the sophisticated devices, it is too short to ignore. But for the Beidou people who are accustomed to nanosecond work, the problem is intolerable.

The result of the acceptance test is very good. How can this happen? Unable to find out why, Liu Jiaxing felt like a thorn in his foot. This thorn must be pulled out. He made a decision to make trouble for the entire development team.

Huge amounts of data have been obtained, but many evidences show that they are in good condition. This may be due to the difference between the whole satellite phase and the stand-alone phase of the data acquisition equipment, the signal quality of this stand-alone should be normal. Single manufacturer explains. But this did not unravel the doubts of Liu Jiaxing.

Liu Jiaxing, who was in an embarrassing situation, remembered his most respectful Beidou three satellite product guarantee manager, Liu Chonghua, as a whole, not to hide the analysis, and to face it bravely. He sincerely encouraged team members to lead you to a more thorough investigation.

Mobilize team strength to work together to find design defects

While organizing the whole star review and state monitoring, the team took advantage of the turning point of the ninth and tenth stars of the Beidou three and coordinated the single machine manufacturer to carry out the matrix investigation. After checking, analyzing and judging the test data, Liu Jiaxing preliminarily identified the pulse condition. It is certain that the performance of the single satellite on the satellite has not declined since the acceptance test. Although there are no two types of test equipment yet, it can be sure that there is a problem in the design of the single machine. Liu Jiaxing said.

Li Zhendong, chief executive designer, is a strong supporter of investigation. After determining the direction of the problem, he compared the difference in the testing environment, the test equipment and the data processing methods in the stage of single machine development and the whole star test, and finally found the errors and shortcomings of the data processing methods in the two stages. On the one hand, he helped the single manufacturer to modify the data processing method. On the other hand, it proposed a scheme to improve the whole star data processing method by adjusting the working state of the whole star test equipment.

Yin Qing, a comprehensive tester, is responsible for the whole satellite test. He adjusted the working state of the whole satellite test equipment in accordance with Li Zhendongs plan, and eliminated the bottleneck problem of subsequent data processing.

The baton passed to the general deputy director, Cui Xiao Yuan. He improved the whole satellite data processing method and upgraded the signal performance analysis software. Finally, he not only determined that the single machine has the problem of index overshoot, but also found that the phase difference between the two signals has abnormal sinusoidal fluctuation. At this point, the external features of the single machine design defects have been fully portrayed, allowing the single machine manufacturers to take care of them, and Liu Jiaxing and the partners have also received the commendation of the General Department of the five courtyard. The award notice also specifically mentioned that the inter satellite link signal performance analysis software developed by the team is a test software developed independently by the general department. It has gradually become the standard software and testing tool for the whole link signal evaluation of the stars, making a great contribution to the energy efficiency and efficiency of the overall work. The source of this article: Global Times - global network. More brilliant, please log on to World Wide Web http://www.huanqiu.com responsible editor: Jia Mingdong _NBJS6491

The baton passed to the general deputy director, Cui Xiao Yuan. He improved the whole satellite data processing method and upgraded the signal performance analysis software. Finally, he not only determined that the single machine has the problem of index overshoot, but also found that the phase difference between the two signals has abnormal sinusoidal fluctuation.

At this point, the external features of the single machine design defects have been fully portrayed, allowing the single machine manufacturers to take care of them, and Liu Jiaxing and the partners have also received the commendation of the General Department of the five courtyard.

The award notice also specifically mentioned that the inter satellite link signal performance analysis software developed by the team is a test software developed independently by the general department. It has gradually become the standard software and testing tool for the whole link signal evaluation of the stars, making a great contribution to the energy efficiency and efficiency of the overall work.