摘要
讨论用绝对重力仪观测数据测定超导重力仪格值精度问题,分析影响该精度的各种可能因素。分析说明,选择大潮期间进行格值标定对提高标定精度有利,标定计算前必须去掉仪器的线性漂移,同时还必须检验并改正数据间的时间偏移。以武汉台用FG5-112绝对重力仪对GWR-C032超导重力仪的实测标定结果表明,达到0.1%的相对标定精度是比较困难的,需要非常长的绝对重力观测时间;而达到0.2%的相对标定精度,仅需要5天的绝对重力观测数据,且可满足大多数超导重力仪观测精度的需求。
The accuracy estimation of the determination of the calibration factor of a superconducting gravimeter using an absolute gravimeter is discussed in detail. Possible factors affecting the accuracy are analyzed. The result indicates that it can minimize the accuracy to choose the observation period as the large tide period. The linear instrumental drift must be deducted before calculation, and the time shift must be checked and corrected. As an example, the calibration experiment at Wuhan station using an absolute FG5112 gravimeter to calibrate the GWRC032 superconducting gravimeter shows that it is comparatively difficult to achieve a relative calibration accuracy of 0.1%, which need very long time absolute gravity data. However, a relative calibration accuracy of 0.2% can meet the requirements to calibrate most of the superconducting gravimeters, and this accuracy can be reached using about 5 days absolute gravity data.
出处
《大地测量与地球动力学》
CSCD
北大核心
2013年第5期145-149,共5页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(41021003
40904019
41074053
41004009)
大地测量与地球动力学国家实验室基金(L10-09)
关键词
FG5绝对重力仪
GWR超导重力仪
格值
仪器漂移
时间偏移
FG5 absolute gravimeter
GWR superconducting gravimeter
calibration factor
instrumental drift
time shift
