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China has completed the construction of a national network for the transmission of the Long Range Navigation (Loran) signal

The completion and successful trial broadcast of the Dunhuang long-wave timing station is an important milestone for China's high-precision ground-based timing system, which not only enhances the coverage and accuracy of China's timing system, but also provides strong support for economic and social operation, scientific and technological development and national security. Here is some key information about the Dunhuang longwave timing station:

Technical breakthroughs: The Dunhuang long-wave timing station has achieved a number of technical breakthroughs during the construction process, including high-precision send and broadcast control and pulse time reference feedback mediation technology, as well as high-stability and high-power pulse signal generation technology. The application of these technologies has enabled the timing accuracy to reach 20 nanoseconds of megawatt-level Roland timing dissemination accuracy, which is ahead of the existing international standard of 50 nanoseconds.

Coverage: Through the construction of three additional longwave timing stations in Dunhuang, Gansu, Korla, Xinjiang and Nagchu, Tibet, combined with the existing longwave timing stations, the nationwide coverage of longwave timing signals has been realised.

Complementary systems: The high-precision ground-based timing system can operate independently of the satellite navigation timing, and serve as a backup to the existing timing system, complement each other's functions and promote each other, thus enhancing the safety and reliability of the timing system.

International Leadership: After nearly 60 years of development, China has built the most complete national timing system in the world in terms of technical means. The timing accuracy has been improved from milliseconds to hundred picoseconds, an improvement of 7 orders of magnitude, which is at the leading level in the world.

Economic and social impact: This advanced timing system is designed to support economic and social operation, promote scientific and technological development and improve national security. It will provide 24-hour continuous, safe and reliable high-precision national standard time signals for users in different spaces, different states and different needs.

In the field of high-precision timing, in addition to progress at the national level, commercial companies are also making technological innovations. For example, Septentrio, a Belgian company, designs, manufactures and markets high-precision GPS/GNSS receivers for demanding applications that require decimetre or centimetre-level accuracy even under difficult conditions.
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