Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (6): 1839-1845.doi: 10.13278/j.cnki.jjuese.201506301

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Conductivity-Depth Imaging of Fixed-Wing Airborne Electromagnetic Data

Zhu Kaiguang, Li Bingbing, Wang Lingqun, Xie Bin, Wang Qi, Cheng Yuqi   

  1. College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130026, China
  • Received:2015-02-08 Published:2015-11-26

Abstract:

The traditional fixed-wing airborne electromagnetic survey lost multi-component measurement information for the reason of using the total field as the data base for the conductivity depth imaging. The imaging precision is decreased due to the non-uniqueness of the dB/dt. A joint conductivity depth imaging approach based on the lookup method of two-component B field response is proposed. Based on the fixed-wing electromagnetic forward calculation, this paper establishes a table of Bx-Bz-conductivity-altitude, uses B field to avoid the uncertainty of conductivity due to the binary value of electromagnetic data, uses the joint lookup method of two-component B field and interpolation algorithm to determine the conductivity, and then takes the advantage of the diffusion depth formula to obtain the depth, and finally to process the joint conductivity depth imaging. Compared to the total field and simple component lookup method applied in the one-dimensional and quasi-two-dimensional forward simulation, the CDI of two-component B field gets more ideal fitting effects; and the imaging precision is improved by 7%.

Key words: fixed-wing airborne electromagnetic, lookup method of two-component magnetic field, joint conductivity-depth imaging, diffusion depth

CLC Number: 

  • P631.3

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