拖曳式海洋三分量磁力梯度仪的数据处理方法与应用

doi:10.3969/j.issn.1001-909X.2024.02.008

海洋学研究 ›› 2024, Vol. 42 ›› Issue (2): 81-90.DOI: 10.3969/j.issn.1001-909X.2024.02.008

拖曳式海洋三分量磁力梯度仪的数据处理方法与应用

党凌峰¹, 吴招才¹^,²^,^*, 董崇志¹, 张家岭¹^,³

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

收稿日期:2023-04-12 修回日期:2023-05-27 出版日期:2024-06-15 发布日期:2024-08-09
通讯作者: 吴招才
作者简介:*吴招才(1980—),男,正高级工程师,主要从事海洋地球物理与海底构造研究,E-mail: wuzc@sio.org.cn。
党凌峰(1999—),男,河南省周口市人,主要从事海洋地球物理方面研究,E-mail: danglf9986@163.com。
基金资助:
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)

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

DANG Lingfeng¹, WU Zhaocai¹^,²^,^*, DONG Chongzhi¹, ZHANG Jialing¹^,³

1. Second Institute of Oceanography, Key Laboratory of Submarine Geosciences, MNR, Hangzhou 310012, China
2. School of Surveying, Mapping and Spatial Information, Shandong University of Science and Technology, Qingdao 266590, China
3. Oceanography Institute, Zhejiang University, Zhoushan 316021, China

Received:2023-04-12 Revised:2023-05-27 Online:2024-06-15 Published:2024-08-09
Contact: WU Zhaocai

摘要/Abstract

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。

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

Abstract:

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.

Key words: geomagnetic three components, calibration of scalar, magnetic gradient tensor, magnetic boundary trend map, Euler deconvolution

中图分类号:

P716.82

党凌峰, 吴招才, 董崇志, 张家岭. 拖曳式海洋三分量磁力梯度仪的数据处理方法与应用[J]. 海洋学研究, 2024, 42(2): 81-90.

DANG Lingfeng, WU Zhaocai, DONG Chongzhi, ZHANG Jialing. Data processing method and application of towed marine three-component magnetic gradiometer[J]. Journal of Marine Sciences, 2024, 42(2): 81-90.

图/表 10

图1 数据采集流程图

Fig.1 Flow chart of data acquisition

图2 测线位置示意图

Fig.2 Sketch map of survey line location

图3 坐标轴旋转示意图 (两个磁力传感器的坐标系分别为O1X1Y1Z1和 O 2 X 2Y2Z2,以 O 1 X 1Y1Z1坐标系为基准,三个旋转角分别为α1、α2、α3。图中虚线表示虚拟理想正交坐标轴。)

Fig.3 Schematic diagram of axis rotation (The coordinate systems of the two magnetometers are O1X1Y1Z1 and O2X2Y2Z2, Based on the axes O1X1Y1Z1, the three rotation angles are α1,α2,α3. The dotted line is the virtual ideal orthogonal coordinate axis.)

图4 磁力传感器T1与T2的三分量磁感应强度数据

Fig.4 Three-component magnetic induction intensity data of magnetometer T1 and T2

图5 三分量磁力梯度数据

Fig.5 Three-component magnetic gradient data

图6 三分量磁力梯度仪合成的地磁总场与G880所测地磁总场对比

Fig.6 Comparison of three-component composite geomagnetic total field with that measured by G880

图7 磁力梯度张量(a)、磁力梯度张量不变量(b)与地磁总场梯度(c)对比图

Fig.7 The contrast diagram of magnetic gradient tensor (a), magnetic gradient tensor invariant (b) and total magnetic field gradient (c)

图8 ISDV曲线与测线磁倾角、磁偏角对比图

Fig.8 Comparison diagram of ISDV curve with magnetic inclination angle and magnetic declination angle of measured line

图9 磁边界走向图 (图中黑色线段的中心点对应磁边界的位置;长线段的方向对应磁边界的磁偏角,线段长度与磁边界磁倾角的余弦值成正比;短线段的长度与磁边界矢量的标准差成正比。)

Fig.9 Strike diagram of magnetic boundary (The central point of the black line segment in the figure corresponds to the position of the magnetic boundary. The direction of the long line segment corresponds to the magnetic declination angle of the magnetic boundary, and the length of the line segment is proportional to the cosine value of the magnetic inclination angle of the magnetic boundary. The length of the short line segment is proportional to the standard deviation of the magnetic boundary vector.)

图10 磁异常剖面(a)、地形剖面(b)与欧拉反演结果(c)对比图

Fig.10 Comparison diagram of magnetic anomaly profile (a), topographic profile (b) and Euler inversion results (c)

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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

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