拖曳式海洋三分量磁力梯度仪的数据处理方法与应用  

Data processing method and application of towed marine three-component magnetic gradiometer

作　　者：党凌峰 吴招才 董崇志 张家岭 DANG Lingfeng;WU Zhaocai;DONG Chongzhi;ZHANG Jialing(Second Institute of Oceanography,Key Laboratory of Submarine Geosciences,MNR,Hangzhou 310012,China;School of Surveying,Mapping and Spatial Information,Shandong University of Science and Technology,Qingdao 266590,China;Oceanography Institute,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]自然资源部第二海洋研究所,自然资源部海底科学重点实验室,浙江杭州310012 [2]山东科技大学测绘与空间信息学院,山东青岛266590 [3]浙江大学海洋学院,浙江舟山316021

出　　处：《海洋学研究》2024年第2期81-90,共10页Journal of Marine Sciences

基　　金：国家自然科学基金项目(42076078);国家重点研发计划项目(2023YFC2808805);中央级公益性科研院所基本科研业务费专项资金资助项目(JG1901);中国-莫桑比克国际合作调查航次(GASI-01-DLJHJ-CM)。

摘　　要：拖曳式海洋三分量磁力梯度仪能够同时获得地磁三分量和磁力梯度数据,与传统的拖曳式总场磁力仪相比具有降低船磁干扰和抵抗地磁日变影响等优点,也存在灵敏度误差、零点偏移误差、正交性误差和位置误差等校准处理的难点。在实际航次中用拖曳式海洋三分量磁力梯度仪实测得到一条剖面数据,经校准后与G880磁力仪重复线测量的地磁总场数据进行外符合精度评价,表明其具有较高的稳定性和可靠性。根据三分量磁力梯度数据计算得到其张量不变量以及磁边界走向图,并结合欧拉反褶积计算,对测线上的磁源体进行了有效识别和解释。结果显示拖曳式海洋三分量磁力梯度仪能够有效获得地磁总场、分量及梯度等多参量信息,可为海洋地磁场测量提供更有效的技术手段。The towed marine three-component magnetic gradiometer can obtain the geomagnetic three-component and magnetic gradient data at the same time.Compared with the traditional towed geomagnetic total field magnetometer,the towed marine three-component magnetic gradiometer has the advantages of reducing the ship magnetic interference and resisting the influence of geomagnetic daily variation,but it also has some shortcomings such as sensitivity error,zero offset error,orthogonality error and position error.In the actual voyage,a section data measured by the towed marine three-component magnetic gradiometer was calibrated to the total geomagnetic field data measured by the G880 magnetometer,which proved its high stability and reliability.Based on the three component magnetic gradient data,the tensor invariants and the trend of magnetic boundary were obtained,and combined with the Euler deconvolution calculation,the magnetic source body on the measurement line was effectively identified and interpreted.The results show that the towed three-component marine gradiometer can effectively obtain the information of geomagnetic field,component and gradient,which can provide a more effective technical means for marine geomagnetic field measurement.

关 键 词：地磁三分量 标量校准 磁力梯度张量 磁边界走向图 欧拉反褶积 

分 类 号：P716[天文地球—海洋科学]