In 2022 China Space Station (CSS) will be equipped with atomic clocks and optical clocks with stabilities of $2 \times 10^{-16}$ and $8 \times 10^{-18}$, respectively, which provides an excellent opportunity to test gravitational redshift (GR) with higher accuracy than previous results. Based on high-precise frequency links between CSS and a ground station, we formulated a model and provided simulation experiments to test GR. Simulation results suggest that this method could test the GR at the accuracy level of $(0.27 \pm 2.15) \times10^{-7}$, more than two orders in magnitude higher than the result of the experiment of a hydrogen clock on board a flying rocket more than 40 years ago.
Formulation of testing gravitational redshift based on Laser Time link between China Space Station and a ground station
Time and Frequency Observation Center (TFOC), School of Geodesy and Geomatics, Wuhan University（武汉大学测绘学院时间频率观测中心）；State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University（武汉大学测绘遥感信息工程国家重点实验室）；School of Surveying and Land Information Engineering, Henan Polytechnic University（河南理工大学测绘与土地信息工程学院）；School of Resource, Environmental Science and Engineering, Hubei University of Science and Technology（湖北科技学院资源环境科学与工程学院）；School of Surveying and Mapping, Information Engineering University（信息工程大学测绘学院）；GNSS Research Center, Wuhan University（武汉大学GNSS研究中心）；School of Remote Sensing and Geomatics Engineering, Nanjing University of Information Science and Technology（南京信息工程大学遥感与地理信息工程学院）
MCI: Multi-Channel Imager on the Chinese Space Station Survey Telescope
Shanghai Astronomical Observatory, Chinese Academy of Sciences（中国科学院上海天文台）；Shanghai Institute of Technical Physics, Chinese Academy of Sciences（中国科学院上海技术物理研究所）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences（中国科学院空间应用工程与技术中心）；Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences（中国科学院长春光学精密机械与物理研究所）；School of Astronomy and Space Science, Nanjing University（南京大学天文与空间科学学院）；Department of Astronomy, Xiamen University（厦门大学天文学系）；School of Physics and Astronomy, Sun Yat-Sen University（中山大学物理学院）；Yunnan Observatories, Chinese Academy of Sciences（中国科学院云南天文台）；Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台）；South-Western Institute for Astronomy Research, Yunnan University（云南大学西南天文研究所）；CSST Science Center for the Yangtze River Delta Region（CSST长三角科学中心）
