The First Steering of the International Atomic Time by Optical Clocks in China
On February 11, 2026, the International Bureau of Weights and Measures (BIPM) released the latest issue of its Time Bulletin (Circular T 457). The strontium optical lattice clock NTSC-Sr2, developed by the National Time Service Center (NTSC) of the Chinese Academy of Sciences, was used as a secondary representation of the second to calibrate International Atomic Time (TAI), marking the first time that an optical clock from China has contributed to steering TAI.
02 13, 2026
Scientists Reveal the Charactistics of LEO Ssatellite Ephemeris: Probability Distribution and Fitting Accuracy
A research team from the National Time Service Center (NTSC), Chinese Academy of Sciences (CAS), studied the probability distribution and fitting accuracy of the ephemeris parameters of LEO satellites flying at different altitudes, revealing the key aspects that require attention in the generation of LEO navigation satellite ephemeris.
02 12, 2026
Uncalibrated LEO satellite code biases on LEO-augmented PPP: Impact and Reality
Recently, the research team from the National Time Service Center (NTSC), Chinese Academy of Sciences (CAS), discussed the impact of uncalibrated LEO(Low Earth Orbit ) satellite code biases on LEO-augmented PPP, bringing the LEO-relevant benefits from perfect assumptions back to reality.
01 12, 2026On the morning of September 9th, the first science popularization demonstration activity of the 2025 National Science Popularization Month in Shaanxi Province was successfully held at the National Time Service Center (NTSC) of the Chinese Academy of Sciences(CAS).
A delegation from Hrvatsko Zagorje Krapina University of Applied Sciences (HZKUAS), led by Dean Nenad Sikirica and Dr. Miksa Marko, visited National Time Service Center (NTSC), Chinese Academy of Sciences on August 12-13, 2025, culminating in the signing of a Memorandum of Understanding (MoU) after in-depth discussion with Navigation and Communication Research Division.
Developed by the research team of the department of Time and Frequency Measurement and Control, the National Time Service Center (NTSC)of the Chinese Academy of Sciences, the "Pakistan MM1 Project Satellite-based Augmentation System (SBAS) timing subsystem " passed the test in January this year, and began to provide stable service in Pakistan in August after two years of development.
70th Anniversary of Beijing Time---National Time Service Center
In March 2001, the Shaanxi Astronomy Observatory was renamed as the National Time Service Center (NTSC) with the approval of the State Commission Office of Public Sector Reform. Since then, NTSC has been focusing on time service: satisfying the urgent needs of China’s development for different precision especially high precision time service
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70th Anniversary of Beiing Time---Low Frequency Time-code Time Service Station
The National Time Service Center (formerly Shaanxi Astronomy Observatory) began to study the low-frequency time code timing technology in 1993. In 1999, a practical test platform was built in Pucheng, Shaanxi Province. In 2007, a high-power low frequency time-code time service station was set up in Shangqiu, Henan Province, the call sign is BPC.
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70th Anniversary of Beijing Time---Long Wave Time Service Station
In order to meet the requirements of measurement and control of satellite launch and space technology development, the development and construction of the long wave time service station (326 project) was launched officially after the approval of the State Council in June 1973.
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70th Anniversary of Beijing Time---Shaanxi Astronomy Observatory
In the 1960s, due to the demands of large-scale economic construction, China decided to build a special time service station in the hinterland of China as soon as possible.
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