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《Acta Oceanologica Sinica》 2008-06
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Diurnal variation correction method based on linear least-squares algorithm in exploration of seamounts

LIU Bao-hua1,2,LIU Chen-guang1,2,PEI Yan-liang1,2,KAN Guang-ming1,2(1.First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;2.Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration,First Institute of Oceanography,State Oceanic Administration,Qingdao 2660061,China)  
In view of the difficulty of observation for diurnal variations during the survey of seamounts in the ocean,a correction method based on a linear least-squares algorithm was introduced.On the supposal of that the time-variation of earth magnetism can be fitted by a high-order polynomial,the coefficients of the polynomial,and the curve of diurnal variations can be obtained using the linear least-squares algorithm of an intersection error.Subtracted diurnal variations from the observed magnetic field,the magnetic anomalies of seamounts removed the influence of diurnal variations can be obtained.Theoretical and real data processing shows that not only the result of the diurnal variations deleting is well,but the computer calculating is simple.Additionally,in order to improve the result of diurnal variation correction,certain problems which may be meet with during the magnetic survey of seamounts are discussed.
【Fund】: 国家“八六三”计划课题“重、磁、地震联合反演技术”资助项目(2006AAD9Z311);; 海洋公益性行业科研专项经费项目“渤海典型区域的海洋多过程数据整合研究”资助项目
【CateGory Index】: P738.3
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