两台同步便携式氢钟不同位置间位差测定的初步实验结果
Preliminary experimental results of determining the geopotential difference between two synchronized portable hydrogen clocks at different locations
摘要：
在这里，我们提供了初步的实验结果的基础上的时间流逝比较两个远程原子钟位于北京和武汉，分别。在北京203所实验室（BIL）完成了两台氢原子原子钟20天的零基线校准后，将其中一台氢原子钟不停机地运到武汉珞珈山时频站（LTS）。基于共视卫星时间传递（CVSTT）技术，两个远程时钟之间进行了65天的连续比较。采用集合经验模式分解（EEMD）技术去除CVSTT观测中的周期信号，得到剩余的钟差序列，并由此确定两个远程钟之间的时间间隔。根据这两个时钟之间的累积时间，确定了这两个台站之间的地球电势差。给定BIL的正高（OH），LTS的OH根据确定的地球电势差确定。比较表明，通过时间推移比较确定的LTS的OH偏离地球重力模型EGM 2008确定的约98米。这一结果与我们实验中所用的氢原子钟（$10^{-15}$ /天量级）的频率稳定度是一致的。此外，我们使用85天的原始观测，以确定基于CVSTT技术的两个远程站之间的位势差。利用更精确的原子钟或光学钟，CVSTT方法在大地测量中有着广泛而有效的应用前景。
英文摘要：
Here, we provide preliminary experimental results of the geopotential determination based on time elapse comparisons between two remote atomic clocks located at Beijing and Wuhan, respectively. After synchronizing two hydrogen atomic clocks at Beijing 203 Institute Laboratory (BIL) for 20 days as zero-baseline calibration, we transport one clock to Luojiashan Time-Frequency Station (LTS), Wuhan, without stopping its running. Continuous comparisons between the two remote clocks were conducted for 65 days based on the Common View Satellite Time Transfer (CVSTT) technique. The ensemble empirical mode decomposition (EEMD) technique is applied to removing the uninteresting periodic signals contaminated in the original CVSTT observations to obtain the residual clocks-offsets series, from which the time elapse between the two remote clocks was determined. Based on the accumulated time elapse between these two clocks the geopotential difference between these two stations was determined. Given the orthometric height (OH) of BIL, the OH of the LTS was determined based on the determined geopotential difference. Comparisons show that the OH of the LTS determined by time elapse comparisons deviates from that determined by Earth gravity model EGM2008 by about 98 m. The results are consistent with the frequency stabilities of the hydrogen atomic clocks (at the level of $10^{-15}$/day) applied in our experiments. In addition, we used 85-days original observations to determine the geopotential difference between two remote stations based on the CVSTT technique. Using more precise atomic or optical clocks, the CVSTT method for geopotential determination could be applied effectively and extensively in geodesy in the future.
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