重力仪一次项格值系数改正对海南重力场变化影响研究

Research on the Influence of Primary Term Scale Coefficient Correction on Gravity Field Change in Hainan

收集整理海南岛2016~2020年10期流动重力复测资料,采用重力仪共用单位标定的一次项格值系数对各期复测资料进行拟稳平差处理。结果显示,2016-09~2017-05、2017-05~10、2018-05~10期间海南重力场变化异常明显。以2016年第1期仪器的一次项格值系数为基准,采用重力差值法对一次项格值系数进行改正,然后重新进行拟稳平差处理。结果显示,2016年以来海南差分重力场变化较平稳,重力场变化基本在30μGal以内,此前出现的显著重力场异常已不存在。因此,采用重力差值法改正一次项格值系数可有效降低因一次项格值系数误差产生的重力场变化误差。

We collect and sort the data of 10 phases of mobile gravity re-measurement from 2016 to 2020 in Hainan.We use the primary term scale coefficient calibrated by gravimeters sharing institutions to adjust the re-measured data of each period.The results show that the gravity field of Hainan has changed significantly during the period 2016-09~2017-05,2017-05~10,2018-05~10.Based on the primary term scale coefficient of the instrument in the first period of 2016,we use the gravity differential method to correct the primary term scale coefficient.We then reprocess the quasi-stable adjustment.The results show that since 2016,the differential gravity field of Hainan has changed relatively smoothly,and the change of the gravity field is basically within 30μGal.The significant gravity field anomalies of Hainan disappear.So,if we use the gravity differential method to correct the primary term scale coefficient,we can effectively reduce the gravity field change error caused by the primary term scale coefficient error.