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Title:: The Estimation Method of the Zero Drift of the Relative Gravimeter in High-precision Time-varying Gravity Observation in Yunnan

作者:: 黄江培¹; 杜家云²; 曹颖¹; 郑秋月¹; 刘东¹; 吴宇琴¹; 王青华¹; (1.云南省地震局,云南昆明 650024; 2.弥勒县地震局,云南弥勒 652399)

Author(s):: HUANG Jiangpei¹; DU Jiayun²; CAO Ying¹; ZHENG Qiuyue¹; LIU Dong¹; WU Yuqing¹; WANG Qinghua¹; (1.Yunnan Earthquake Agency,Kunming 650224,Yunnan,China; 2.Mile Earthquake Agency,Mile 652399,Yunnan,China)

Keywords:: drift rate; the Bayesian estimation; mobile-gravity observation; adjustment results; Yunnan

摘要:: 针对在陆地百千米以上的时变流动重力观测网络中,相对重力仪非线性漂移率和仪器性能偏差是影响观测结果精度的主要误差来源这一问题,以1990—2022年云南流动重力观测数据为例,对比传统最小二乘平差方法和贝叶斯平差方法得到的非线性漂移率结果,系统测评了贝叶斯估计方法对于提高重力平差结果精度的有效性。结果表明,可以通过贝叶斯优化方法给出合适的仪器权重和非线性漂移率,减少多台相对重力仪性能差异造成的误差和传统线性漂移计算方法造成的有效漂移遗失,提高平差结果的精度。

Abstract:: In the time-varying gravity observation network covering hundreds kilometers of land,the nonlinear drift rate of the relative gravimeter and the instrument performance deviation are the main error sources that affect the accuracy of the observational results.In this paper,the drift rates of the mobile-gravity observational data from 1990 to 2022 in Yunnan are calculated respectively with the Bayesian gravity adjustment method and the traditional least squares adjustment method.Then the non-linear dirft rate results from these two methods are compared,and the effectiveness of the Bayesian estimation method in improving the accuracy of gravity adjustment results is systematically evaluated.The results show that the appropriate instrument weight and nonlinear drift rate can be given by the Bayesian optimization method,in order to reduce the error caused by the performance difference of multiple relative gravimeters,and reduce the effective-drift loss caused by the traditional linear drift calculation method.In this way the accuracy of the adjustment results is improved.