基于滑动奇异谱分析方法的重力固体潮提取  

Extraction of Gravity Tide Correction Based on Sliding Singular Spectrum Analysis Method

作　　者：王建波 王晋南 孙洁 齐鑫敏 刘相威 高文宗 WANG Jianbo;WANG Jinnan;SUN Jie;QI Xinmin;LIU Xiangwei;GAO Wenzong(School of Marine Technology and Geomatics,Jiangsu Ocean University,59 Cangwu Road,Lianyungang 222005,China;Heze Surveying and Mapping Institute,1717 Zhujiang Road,Heze 274002,China;College of Geodesy and Geomatics,Shandong University of Science and Technology,579 Qianwangang Road,Qingdao 266590,China)

机构地区：[1]江苏海洋大学海洋技术与测绘学院,江苏省连云港市222005 [2]菏泽市测绘研究院,山东省菏泽市274002 [3]山东科技大学测绘与空间信息学院,青岛市266590

出　　处：《大地测量与地球动力学》2021年第8期865-870,共6页Journal of Geodesy and Geodynamics

基　　金：江苏海洋大学“测绘科学与技术”重点学科项目;江苏海洋大学人才引进项目(KQ17024)。

摘　　要：提出采用滑动奇异谱分析(singular spectrum analysis,SSA)方法进行长时间重力固体潮改正提取。采用61 d静态相对重力测量数据,利用滑动SSA方法将数据按连续时间段10 d、15 d、20 d、25 d、30 d、40 d和50 d分别分为52组、47组、42组、37组、32组、22组和12组进行重力固体潮改正提取实验。参考理论值分别选用CG-5重力仪自带软件计算结果(CG5_Data)和实测重力数据采用Eterna调和分析获得潮波参数后用TSoft软件计算结果(ET_Data)。结果表明,参考理论值选用ET_Data时,残差的RMS和STD比选用CG-5重力仪计算结果小;采用不同方法提取的重力固体潮改正残差的标准差均小于11μGal;与SSA方法相比,当选择合适的连续时间段时,滑动SSA方法提取固体潮能降低结果残差的离散程度;选择连续时间段30 d、40 d时,滑动SSA提取结果比SSA提取结果残差的RMS分别小0.219μGal和0.602μGal(CG5_Data)以及0.430μGal和0.665μGal(ET_Data)。This paper proposes to use sliding singular spectrum analysis(SSA)method for long-term gravity tide correction extraction.The experiment uses 61 days static relative gravity measurement data,and sliding SSA method to divide the data into 52 groups,47 groups,42 groups,37 groups,32 groups,22 groups,and 12 groups according to continuous time periods of 10 days,15 days,20 days,25 days,30 days,40 days,and 50 days.These data are used for gravity tide extraction experiments.We refer to the theoretical values to select the calculation results of the CG-5 gravimeter software(CG5_Data)and the measured gravity data using Eterna harmonic analysis to obtain the tidal wave parameters,and then we use TSoft software to calculate the results(ET_Data).The results show that when ET_Data is selected as the reference theoretical value,the RMS and STD of the residuals are smaller than those calculated by the CG-5 gravimeter as the reference theoretical value.The STD of gravity tide correction residuals extracted by different methods are all less than 11μGal.Comparing with SSA method,when the appropriate continuous time period is selected,the extraction of gravity tide by sliding SSA method can reduce the dispersion of the result residuals.The residual RMS of 30-day and 40-day sliding SSA extraction results is 0.219μGal and 0.602μGal(CG5_Data)and 0.430μGal and 0.665μGa(ET_Data)smaller than the SSA extraction results.

关 键 词：静态相对重力测量 滑动SSA 重力固体潮改正 海潮改正 

分 类 号：P223[天文地球—大地测量学与测量工程]