摘要
针对中国大陆重力站主要装备的gPhone相对重力仪(约62套)由于缺乏标定,限制其高精度重力数据的科学应用的问题,收集了中国大陆12站同址FG5绝对重力观测与同时段gPhone观测的资料,提出了基于DDW-NHi全球潮汐模型约束的FG5绝对比测标定gPhone重力仪的方法,并与gPhone重力仪出厂格值法、理论固体潮标定法进行比较,讨论未来绝对重力标定的策略.研究结果表明:利用同址绝对观测时长26~64 h资料标定gPhone重力仪,格值系数的相对误差为±0.0013~±0.0038;标定后各站重力残余振幅≤1×10^(-8)m/s^(2),达到gPhone重力仪标称精度,优于出厂格值和理论固体潮标定结果;标定后经固体潮、气压负荷潮改正的重力残差振幅与中国大陆海潮负荷规律相符.
The gravity stations in Chinese are mainly equipped with gPhone relative spring gravimeters(about 62 sets),which lack calibration by absolute gravity and restrict the scientific utilization with their high-precision continuous gravity data.The FG5 absolute gravity and the gPhone observation data at the same site from the Chinese 12 gravity stations were collectd,gPhone gravimeter calibrating method by FG5 absolute gravity simultaneous observations based on the constraints of the DDW-NHi global tidal model was proposed,and it was compared with the gPhone gravimeter factory scale factor method and the theoretical tide calibration method for the DDW-NHi.At last,the future strategy of absolute gravity calibration was discussed.It’s shown that when the gPhone gravimeters are calibrated by the absolute observation time for 26~64 h at the same site,the relative error is about±0.0013~±0.0038.The gravity residual amplitude of each station in the absolute calibration result is generally≤1×10^(-8)m/s^(2),reaching the nominal accuracy of gPhone gravimeter,which is better than the calculation results of factory scale factor or theoretical tide calibration method.The gravity residual amplitude corrected by the earth tide and air pressure is consistent with the ocean tidal load in Chinese mainland.
作者
韦进
胡敏章
申重阳
王嘉沛
WEI Jin;HU Mingzhang;SHEN Chongyang;WANG Jiapei(Institute of Seismology,China Earthquake Administration,Wuhan 430071,China;Gravitation and Earth Tide,National Observation and Research Station,Wuhan 430071,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第9期41-47,共7页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(41204058)
武汉引力与固体潮国家野外观测研究站开放基金资助项目(WHYWZ202106)。
