Feedback Scale因子对Burris型相对重力仪观测成果的影响
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摘要
对3台Burris型重力仪系统中的feedback scale因子对相对重力测量成果的影响进行测试分析和研究。结果表明, feedback scale因子值与Burris型重力仪读数线性相关,且线性系数与FBK改正值有关。若feedback scale因子值产生等比例的变化,FBK改正值越大,仪器读数的变化越大。在feedback scale因子值增加时,FBK改正值的正负符号决定仪器读数变化的方向。在重力值差仅有17 mGal的测段上测量时,3台Burris型重力仪基本相同的feedback scale因子变化量,得到的不同重力值差最大可相差0.140 mGal。当同一台仪器在FBK改正值分别为-14.7 mGal和2.2 mGal的2个测点进行测量时,若feedback scale因子值变化2%,测量所得重力值差的变化超过0.300 mGal。
With three Burris relative gravimeters, we study the effect of feedback scale factor in the meter system on relative gravity observation results. The study indicates there are linear relationships between the feedback scale factor and meter readings of Burris. The larger FBK correlation, the larger change of meter readings, and the positive or negative FBK correlation, determine the direction of gravimeter readings variation as feedback scale factor increases. When the three Burris gravimeters are employed to survey a gravity difference that is 17 mGal between two sites, there are variations of gravity difference, although the changes of feedback scale factor are similar and the largest variation is 0.140 mGal. When one Burris gravimeter is used to measure a gravity difference between two sites, where the FBK correlations are-14.7 mGal and 2.2 mGal, the change of measured gravity difference is larger than 0.300 mGal, if the feedback scale factor changes 2%.
With three Burris relative gravimeters, we study the effect of feedback scale factor in the meter system on relative gravity observation results. The study indicates there are linear relationships between the feedback scale factor and meter readings of Burris. The larger FBK correlation, the larger change of meter readings, and the positive or negative FBK correlation, determine the direction of gravimeter readings variation as feedback scale factor increases. When the three Burris gravimeters are employed to survey a gravity difference that is 17 mGal between two sites, there are variations of gravity difference, although the changes of feedback scale factor are similar and the largest variation is 0.140 mGal. When one Burris gravimeter is used to measure a gravity difference between two sites, where the FBK correlations are-14.7 mGal and 2.2 mGal, the change of measured gravity difference is larger than 0.300 mGal, if the feedback scale factor changes 2%.
引文
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[9] 梁伟锋,刘芳,祝意青,等.重力仪一次项系数对重力场动态变化的影响研究[J].大地测量与地球动力学,2015,35(5):882-886(Liang Weifeng,Liu Fang,Zhu Yiqing,et al.Research on the Effect of One Degree Term of Chromatic Polynomial of Gravimeter on Gravity Dynamic Change[J].Journal of Geodesy and Geodynamics,2015,35(5):882-886)
[2] Zhu Y Q,Zhan F B ,Zhou J C,et al.Gravity Measurements and Their Variations before the 2008 Wenchuan Earthquake[J].Bull Seis Soc Am,2010,100(5B):2 815-2 824
[3] 周江存,徐建桥,孙和平.中国大陆精密重力潮汐改正模型[C].中国测绘学会第9次全国会员代表大会暨学会成立50周年纪念大会,北京,2009(Zhou Jiangcun,Xu Jianqiao,Sun Heping.Accurate Correction Models for Tidal Gravity in Chinese Continent[C].The 9th National Congress of the Surveying and Mapping Society of China and the 50th Anniversary of the Founding of the Society,Beijing,2009)
[4] 赵云峰,祝意青,梁伟锋,等.Burris型重力仪性能分析[J].地震地磁观测与研究,2018,39(2):178-185(Zhao Yunfeng,Zhu Yiqing,Liang Weifeng,et al.Study on the Characteristics of Burris Gravimeter[J].Seismological and Geomagnetic Observation and Research,2018,39(2):178-185)
[5] 赵云峰,隗寿春,梁伟锋,等.Burris型重力仪温度特性研究[J].大地测量与地球动力学,2018,38(8):877-880(Zhao Yunfeng,Wei Shouchun,Liang Weifeng,et al.Temperature Characteristics of Burris Relative Gravimeter[J].Journey of Geodesy and Geodynamics ,2018,38(8):877-880)
[6] Valliant H D,Gagnon C,Halfpenny J F.An Inherently Linear Electrostatic Feedback Method for Gravity Meters[J].J Geophys Res,1986,91 (B10):10 463-10 469
[7] Jentzsch G ,Schulz R ,Weis A .Automated Burris Gravity Meter for Single and Continuous Observation[J].Geodesy and Geodynamics,2018,9(3):204-209
[8] Hugill A L ,Valliant H D.Limitations to the Application of Electrostatic Feedback in Gravity Meters[J].Journal of Geophysical Research:Solid Earth,1986,91(B8):8 387-8 392
[9] 梁伟锋,刘芳,祝意青,等.重力仪一次项系数对重力场动态变化的影响研究[J].大地测量与地球动力学,2015,35(5):882-886(Liang Weifeng,Liu Fang,Zhu Yiqing,et al.Research on the Effect of One Degree Term of Chromatic Polynomial of Gravimeter on Gravity Dynamic Change[J].Journal of Geodesy and Geodynamics,2015,35(5):882-886)
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