摘要
提出一种利用重力观测数据得到DZW重力仪非线性零漂的新方法。该方法核心算法为贝叶斯公式,原理为以零漂的连续性作为先验约束条件,考虑重力观测数据浮动产生的偏差,将每个采样点零漂的均值和方差作为超参数进行求解。该算法可以重复运算,随着计算次数的增加,超参数会趋向于收敛极限,从而得到最优解。经过数据验证,该算法可以精准得到非线性零漂曲线。零漂校正后重力观测值的方差为1.59553×10^(-10)μGal^(2),可为DZW重力仪的测量精度提供保证。
We present a new method to obtain the nonlinear zero drift of DZW gravimeter by using gravity observation data.The main algorithm of this method is a Bayesian formula.The principle is to take the continuity of zero drift as an a priori constraint,consider the deviation caused by the floating of gravity observation data,and solve the mean and variance of drift at each sampling point as hyper-parameters.The algorithm in this paper can be used repeatedly.With the increase of evaluation time,the hyper-parameters will tend to the convergence limit,so as to obtain the optimal solution of the algorithm.Through data verification,the accurate nonlinear zero drift curve can be obtained.During zero drift correction,the variance of gravity observation value can be obtained which is 1.59553×10^(-10)[μGal]^(2).The algorithm in the paper ensures the measurement accuracy of DZW gravimeter.
作者
陈善勇
杨江
CHEN Shanyong;YANG Jiang(Institute of Seismology,CEA,Wuhan 430071,China;Wuhan Institute of Seismic Scientific Instruments Co Ltd,Wuhan 430071,China;Engineering Technology Research Center for Earthquake Monitoring and Early Warning Disposal of Major Projects in Hubei Province,11 Qinglong Road,Xianning 437000,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2022年第6期637-642,共6页
Journal of Geodesy and Geodynamics
基金
湖北省科技创新重大项目(2019AAA053)。
