The accuracy of the hottest Beidou heart is 1 seco

Beidou heart accuracy differs by 1 second every 3 million years

release date: Source: Zhongguancun

the official opening of Beidou has attracted the attention of the world, and China finally has its own satellite navigation system. However, behind the success of Beidou, Chinese Beidou people spent 26 years mobilizing 41. The correct clamping of samples is very important for the experiment. More than 00 units and more than 300000 scientific and technological personnel participated in the research and development. The accuracy of Beidou heart is one second worse every three million years, which has become the best proof of China's scientific and technological take-off

the accuracy of the Beidou heart differs by 1 second every 3 million years

the accuracy of the Beidou heart differs by 1 second every 3 million years, which refers to the accuracy of the satellite navigation system on timing. The essence of the navigation system is a time measurement system. If the satellite has a time error of one billionth of a second (1 nanosecond), it will produce a ranging error of 0.3 meters. Only by configuring a high-precision atomic clock on the satellite can the satellite broadcast and send high-precision navigation and positioning signals directly

among the many necessary components of Beidou satellite, rubidium atomic clock can be said to be the "heart" of Beidou satellite, which determines the accuracy of positioning, speed measurement and timing functions

according to the experts of aerospace group, the rubidium clock imported in that year was still in an important strategic opportunity period for the development of China's third class graphite mine. It took 18 months to produce the rubidium clock. At that time, China's scientific research team took charge of the Research Institute and worked day and night for 8 months. Finally, the rubidium clock on board was successfully delivered, and the first star of Beidou II was launched on schedule. 3? Since the publication of the special activity of product quality supervision and testing, the domestic rubidium clock has gradually replaced the imported rubidium clock, with an accuracy of one second every three million years

as one of the three key technologies of the new generation Beidou navigation satellite, the passive spaceborne hydrogen atomic clock developed by the Shanghai Observatory of the Chinese Academy of Sciences has a 1-second error for about millions or even 10million years, and recently won the first prize of the 2019 Shanghai Science and technology progress award

at present, only European Galileo satellites are equipped with on-board hydrogen clocks abroad. Compared with China's on-board hydrogen clocks, their ground test performance is equivalent, but from the perspective of in orbit comprehensive performance, the user ranging error achieved by China's on-board hydrogen clocks is smaller. "The hydrogen clock has provided strong technical support for China's Beidou navigation satellite system to compete with GPS, Galileo and other satellite navigation systems." Evaluated by an academician in the field of Aerospace Engineering in China