Abstract:In order to distinguish the magnetic anomaly of small-scale magnetic objects from strong geomagnetic field and improve the single-point position-ing accuracy of magnetic objects,a single-point positioning method based on second-order magnetic tensor Euler deconvolution is proposed.First the concept of the second-order tensor system and its measurement are discussed based on the planar cross magnetic gradient tensor system.Then the relationship between first-order and second-order tensor data of magnetic source and their position vectors is derived with 3D Euler deconvolution formula.Finally the invariant relationship between the eigenvectors of the tensor matrix eigenvalues and the position vector of magnetic source is derived under the magnetic dipole field,and magnetic source coordinates are calculated.Model data tests show that the proposed method can accurately locate single-point objects in a uniform strong magnetic field.Real data tests show that the proposed method achieves the small-scale magnet positioning root-mean-square error (RMSE) less than 10cm after the system error correction.
李青竹, 李志宁, 张英堂, 范红波. 基于二阶磁张量欧拉反褶积的磁源单点定位方法[J]. 石油地球物理勘探, 2019, 54(4): 915-924.
LI Qingzhu, LI Zhining, ZHANG Yingtang, Fan Hongbo. Magnetic source single-point positioning based on second-order magnetic tensor Euler deconvolution. Oil Geophysical Prospecting, 2019, 54(4): 915-924.
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