十字形磁梯度张量结构在多磁偶极子测量中的误差与修正方法

The error and correction of cross-shaped magnetic gradient tensor in multi-magnetic dipole measurement

磁场全张量探测技术在多磁源反演中有着重要意义。十字形磁梯度张量结构因其计算简单、精度高等特点被广泛采用,但其在多磁源反演中的全方位误差分析和修正方法有待完善。文章研究多磁偶极子分辨的问题,分析十字形计算结构和误差来源;结果表明磁力仪的精度、整体结构、背景环境和基线选取都会造成误差,甚至导致错误;最后给出修正方法和建议,同时提出可行的扫描方法。

The magnetic field full tensor detection is a promising technique for the multi-magnetic source inversion. The cross-shaped magnetic gradient tensor structure is widely used for its simple calculation, high precision and other desirable characteristics. But the systematic error analysis and the correction methods in the multi-magnetic source inversion field remain to be improved. This paper studies the multi-dipole discrimination, analyses the calculation structure and the error sources of cross shape. It is shown that the magnetometer precision, the overall structure, the background environment and the baseline selection will all cause errors, and even lead to mistakes. The correction methods and suggestions are then proposed, as well as a feasible scanning method.