On the morning of September 30th, a major national scientific and technological infrastructure project, the high-precision geodetic timekeeping system at the Dunhuang longwave timekeeping station, operated by the National Time Center under the Chinese Academy of Sciences, successfully began broadcasting. The ceremony was attended by Zhu Jianjun, Deputy Secretary of the Dunhuang Municipal Party Committee and Mayor, Zhang Shugang, Director of the Xi'an Branch of the Chinese Academy of Sciences and Director of the National Time Center, along with senior leaders from the Basic Capabilities Bureau of the Chinese Academy of Sciences, the Lanzhou Branch, the Xi'an Branch, the National Astronomical Observatory, and the Second Research Institute of China Electronics Technology Group. The ceremony was presided over by Li Xiaohui, Deputy Director of the National Time Center and Vice General Commander (Technical) of the high-precision geodetic timekeeping system project.
During the trial broadcast ceremony, Li Xiaohui briefly reviewed the project's construction of the high-precision geodetic timekeeping system, particularly the construction of the Dunhuang Timekeeping Station and monitoring station. Zhu Jianjun, on behalf of the Dunhuang Municipal Party Committee and Government, gave a speech. Subsequently, Zhang Shugang announced that the trial broadcast had officially begun.
Inside the control room, with the assistance of staff using flag signals, the Dunhuang Timekeeping Station's equipment was started up in an orderly manner. The large monitor displaying live surveillance showed the instantaneous long-wave time signal received by the Dunhuang Monitoring Station and the Hami Field Test Station. Zhang Shougang announced that the trial broadcast had been completed successfully, and the national flag waved vigorously as participants erupted in enthusiastic applause.
据悉, the project to build high-precision ground-based time and frequency reference systems includes the construction of three new enhanced longwave time and frequency transmission stations in Gansu Dunhuang, Xinjiang Kuerle, and Tibet Natches. By combining these with existing longwave time and frequency transmission stations, it is possible to achieve nationwide coverage of longwave time and frequency signals. The Dunhuang longwave time and frequency transmission station is the first longwave time and frequency transmission station built in the high-precision ground-based time and frequency system. Researchers have overcome the technical challenges of high-precision transmission control and pulse time base feedback adjustment, as well as high-stability, high-power pulse signal generation technology, achieving 20 nanosecond, megawatt-level Roland time and frequency transmission accuracy, which is ahead of the current international standard of 50 nanoseconds. By utilizing differential enhancement information, users can improve timing precision from microsecond levels to ten nanosecond levels. The Dunhuang time and frequency station has successfully completed its initial transmission, marking another step forward in the construction of China's air-space-ground integrated time and frequency system.
(GVZ's aside: Long wave... receiving...)
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