On tidal tilt corrections to large ring laser gyroscope observations
On tidal tilt corrections to large ring laser gyroscope observations
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DOI：
10.1093/gji/ggt415
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发表时间：
2014
影响因子：
2.8
通讯作者：
W. Tian
中科院分区：
文献类型：
--
作者：
W. Tian
摘要随着近几十年来大型环形激光陀螺技术的快速发展，目前运行大型环形激光陀螺的各个研究组已经实现了在地球物理学和大地测量学（例如，观测地球自转的高频变化、地球潮汐倾斜和地震波）中的有希望的应用。在这封信中，我们指出，在大量以前的倾斜校正模型的一个重要的术语是失踪。该项与Shida数l2（以下称为l2项）有关，对RLG的Sagnac频率记录的贡献可与海潮引起的地球自转高频变化相媲美。这一项必须从原始数据中删除（作为倾斜校正的一部分），以便RLG可以有效地用作地球自转探测器。
SUMMARY With the fast development of the large ring laser gyroscope (RLG) technology in the last decades, promising applications in geophysics and geodesy (e.g. observations of highfrequency variations of Earth’s rotation, Earth’s tide tilt and seismic waves) have been realized by various groups with currently running large RLGs. In this letter, we point out that in a large number of previous tilt correction models a significant term is missing. This term is related with the Shida number l2 (called l2-term in the following) and has a contribution, which is comparable with that from high-frequency Earth rotation variations due to ocean tides, to the Sagnac frequency record of RLGs. This term has to be removed (as part of the tilt correction) from the raw data so that RLGs can efficiently be employed as Earth’s rotation detectors.