EGU2020-2349
https://doi.org/10.5194/egusphere-egu2020-2349
EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Test of gravitational redshift based on tri-frequency combination of frequency links between Atomic Clock Ensemble in Space and a ground station

Xiao Sun1, Wen-Bin Shen1,2, Ziyu Shen3, Chenghui Cai1, Wei Xu1, Pengfei Zhang1, and Mostafa Ashry1,2
Xiao Sun et al.
  • 1School of Geodesy and Geomatics, Wuhan University, Wuhan, China
  • 2State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan university, Wuhan, China
  • 3Hubei University of Science and Technology, Xianning, China

Atomic Clock Ensemble in Space (ACES) is an ESA mission designed mainly to test gravitational redshift with high-performance atomic clocks in space and on the ground. Here we develop tri-frequency combination (TFC) method based on the measurements of frequency shifts of three independent microwave links between ACES and a ground station. The potential scientific object requires an accuracy of at least 3×10-16, thus we need to consider various effects including Doppler effect, second-order Doppler effect, atmospheric frequency shift, tidal effects, refraction caused by atmosphere, Shapiro effect, with accuracy level of tens of centimeters. The ACES payload will be launched in middle of 2021, and the formulation proposed in this study will enable us to test gravitational redshift at an accuracy level at least 2×10-6 level, one order more higher than the present accuracy level. This study is supported by NSFCs (grant Nos. 41721003, 41631072, 41874023, 41804012, 41429401, 41574007) and Natural Science Foundation of Hubei Province of China (grant No. 2019CFB611).

How to cite: Sun, X., Shen, W.-B., Shen, Z., Cai, C., Xu, W., Zhang, P., and Ashry, M.: Test of gravitational redshift based on tri-frequency combination of frequency links between Atomic Clock Ensemble in Space and a ground station, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-2349, https://doi.org/10.5194/egusphere-egu2020-2349, 2020

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