Absolute gravity determination with JILAG-3 — improved data evaluation and instrumental technics
Absolute gravity determination with JILAG-3 — improved data evaluation and instrumental technics
复制标题
使用 JILAG-3 进行绝对重力测定 — 改进的数据评估和仪器技术
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
M. Schnüll
中科院分区：
文献类型：
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作者：
L. Timmen;R. H. Röder;M. Schnüll
除了在使用绝对重力仪JILAG-3进行测量期间进行在线数据评估外，还对测量的时间/距离数据对进行了更深入的检查。这样就可以对重力结果、台站质量和测量条件进行额外评估。原始数据中的正弦扰动使重力测定变差。在大量的测量之后，输入的脉动随机地影响自由落体实验的平均结果。重力仪在测量过程中的仪器振动可能会系统地影响重力测量结果。通过台站比较，可以看出JILAG-3本身触发了30 Hz的频率，根据地基的稳定性对测量产生影响。使用数学滤波器，可以将劣化与重力加速度分离。到目前为止，还不能证明滤波后重力绝对精度的提高，但表明精度有所提高。
In addition to the on-line data evaluation during the measurements with the absolute gravity meter JILAG-3, a subsequently more intensive examination of the measured time/distance data pairs is performed. This allows an additional assessment of the gravity results, the station quality and the measurement conditions. Sinusoidal disturbances in the raw data deteriorate the determination of gravity. Incoming microseisms affect the mean result of the free-fall experiments randomly after a large number of measurements. Instrumental vibrations of the gravity meter during the measurement procedure may influence the gravity result systematically. A station comparison indicates that a 30 Hz frequency is triggered by JILAG-3 itself and influences the measurements depending on the stability of the foundation. Using a mathematical filter it is possible to separate the deteriorations from the gravity acceleration. Up to now an improvement in the absolute accuracy of gravity after filtering could not be proved, but an increase of the precision is indicated.