Gravitational Potential Difference Between Optical-Atomic Clocks onboard China Space Station (CSS) and Ground Station via Optical Time Transfer links
- 1Time and Frequency Geodesy Center, School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China.
- 2State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China.
- 3Geomatics Engineering Department, Faculty of Engineering at Shoubra, Benha University, Cairo 11629, Egypt.
- 4School of Resource, Environmental Science and Engineering, Hubei University of Science and Technology, Xianning 437100, China.
- 5Civil Engineering Department, Faculty of Engineering, Minia University, Minia 61111, Egypt.
High accuracy and stability of time and frequency transfer links are significant to realizing high-precision time synchronization in geodesy, navigation, and metrology. Also, the current and future challenges for space and ground geodetic observatories are to transfer high-stability time and frequency signals between remote locations. Therefore, future optical spatial links, such as Laser Time Transfer (LTT) on China Space Station (CSS) which will equip with atomic clocks and optical clocks with stabilities of 2 × 10−16 and 8 × 10−18, respectively, are a promising technique for high-precision time transfer links, because laser time transfer links are highly accurate, with fewer delays, and unambiguous observable compared to microwave domain links. The most promising applications for optical time transfer links and optical clocks are fundamental physics and relativistic geodesy. For instance, gravitational redshift test and determination of relativistic geoid. Based on the gravitational frequency shift effect predicted by General Relativity Theory (GRT), this study discusses an approach for determining the gravitational potential difference between optical-atomic clocks onboard China Space Station (CSS) and ground station via optical time transfer link, which could have potential applications in geoscience. For testing purposes, we will use the observations of the Time Transfer by Laser Link (T2L2) on the Jason-2 mission to evaluate the performances of the data analysis algorithm. This study is supported by the National Natural Science Foundations of China (NSFC) under Grants 42030105, 41721003, 41804012, 41974034, 41631072, 41874023, Space Station Project (2020)228, and the Natural Science Foundation of Hubei Province of China under Grant 2019CFB611.
How to cite: Ruby, A., Shen, W., Shaker, A., Zhang, P., Shen, Z., and Ashry, M.: Gravitational Potential Difference Between Optical-Atomic Clocks onboard China Space Station (CSS) and Ground Station via Optical Time Transfer links, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-1231, https://doi.org/10.5194/egusphere-egu22-1231, 2022.
