Luo Dan, Xu Mingyang, Wang Panpan, Wu Hanzhong, Shao Chenggang
MOE Key Laboratory of Fundamental Physical Quantities Measurement, Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
Sensors (Basel). 2024 Mar 24;24(7):2069. doi: 10.3390/s24072069.
In future space-borne gravitational wave (GW) detectors, time delay interferometry (TDI) will be utilized to reduce the overwhelming noise, including the laser frequency noise and the clock noise etc., by time shifting and recombining the data streams in post-processing. The successful operation of TDI relies on absolute inter-satellite ranging with meter-level precision. In this work, we numerically and experimentally demonstrate a strategy for inter-satellite distance measurement. The distances can be coarsely determined using the technique of arm-locking ranging with a large non-ambiguity range, and subsequently TDI can be used for precise distance measurement (TDI ranging) by finding the minimum value of the power of the residual noises. The measurement principle is introduced. We carry out the numerical simulations, and the results show millimeter-level precision. Further, we perform the experimental verifications based on the fiber link, and the distances can be measured with better than 0.05 m uncertainty, which can well satisfy the requirement of time delay interferometry.
在未来的星载引力波（GW）探测器中，将利用时间延迟干涉测量法（TDI），通过在后处理中对数据流进行时移和重新组合，来降低包括激光频率噪声和时钟噪声等在内的压倒性噪声。TDI的成功运行依赖于米级精度的绝对卫星间测距。在这项工作中，我们通过数值模拟和实验演示了一种卫星间距离测量策略。可以使用具有大无模糊范围的臂锁定测距技术粗略确定距离，随后通过找到残余噪声功率的最小值，TDI可用于精确距离测量（TDI测距）。介绍了测量原理。我们进行了数值模拟，结果显示精度达到毫米级。此外，我们基于光纤链路进行了实验验证，距离测量的不确定度优于0.05米，这能够很好地满足时间延迟干涉测量的要求。
