| 中国空间站微波链路引力红移检验仿真实验 |
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| 引用本文： | 申文斌,张朋飞,申子宇,许锐,高玉平.中国空间站微波链路引力红移检验仿真实验[J].武汉大学学报(信息科学版),2022,47(6):849-854. |
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| 作者姓名： | 申文斌 张朋飞 申子宇 许锐 高玉平 |
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| 作者单位： | 1.武汉大学测绘学院，湖北 武汉，430079 |
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| 基金项目： | 国家自然科学基金42030105国家自然科学基金41721003国家自然科学基金41804012国家自然科学基金41974034国家自然科学基金41631072国家自然科学基金41874023中国科学院空间科学与应用总体部科学实验项目(2020)228湖北省自然科学基金2019CFB611 |
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| 摘 要： | 利用高精度空载/星载原子钟进行引力红移检验是物理学领域的研究热点。随着原子钟精度的不断提高，利用高精度时频信号检验引力红移和测定重力位成为可能。中国空间站二号实验舱预计于2022年10月在轨运行，并搭载高精度原子钟组，为高精度引力红移实验奠定了基础。利用中国空间站的一组上行微波链路与下行微波链路进行双向时间/频率比对，从而实现引力红移检验。由于两条链路的频率及路径相同且极化方向相反，可以极大地消除误差干扰。结果表明，当空间站搭载的原子钟稳定度为且长期稳定度约为10-18量级时，引力红移检验精度可达到10-7量级，比目前国际上最高的引力红移检验精度高1~2个量级。
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| 关 键 词： | 广义相对论 引力红移 高精度时频信号 重力位 时频信号传递 |
| 收稿时间： | 2022-05-11 |
Simulation Test of Gravitational Redshift by Microwave Links of China Space Station |
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| Institution: | 1.School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China2.State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China3.School of Resource, Environmental Science and Engineering, Hubei University of Science and Technology, Xianning 437000, China4.University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Objectives Gravitational redshift test using high precision space-borne/sattelite-payload atomic clocks is always a hot topic in physics. With the improvement of the accuracy of atomic clocks, it is possible to use high-precision time-frequency signals to test the gravitational redshift and determine the gravitational potential. Methods The experiment module of China space station (CSS) is expected in orbit in October 2022, which lays a foundation for high-precision gravitational redshift experiment. The dual-frequency combination method is applied to eliminate the propagation frequency shifts by using an uplink and a downlink with the same frequency and different polarization direction. The gravitational redshift simulation experiment is carried out by using the microwave links of CSS time-frequency comparison system. Results The results show that the stability of atomic clock achieves , the long term stability reaches 10-18, and the accuracy of gravitational redshift reaches 10-7. Conclusions It is 1-2 orders of magnitude higher than the highest accuracy of gravitational redshift in the world. |
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