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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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An Aeromagnetic Compensation Method for Suppressing the Magnetic Interference Generated by Electric Current with

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This study introduces a new method to reduce magnetic interference from onboard electronics in aeromagnetic surveys. The novel compensation model effectively suppresses electric current magnetic interference and geomagnetic gradients for improved data accuracy.

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Area of Science:

  • Geophysics
  • Aeromagnetic Surveying
  • Signal Processing

Background:

  • Aeromagnetic detection is crucial for geological surveys.
  • Onboard electronic (OBE) equipment generates magnetic interference, impacting data quality.
  • Advancements in aeromagnetic compensation technology necessitate addressing electric current magnetic interference (ECMI).

Purpose of the Study:

  • To propose a novel compensation method for aeromagnetic detection.
  • To suppress electric current magnetic interference (ECMI) and geomagnetic gradient interference.
  • To improve the overall performance of aeromagnetic compensation models.

Main Methods:

  • A compensation model is built using synthetically total magnetic field (STMF) data from a fluxgate vector magnetometer.
  • Singular spectrum analysis (SSA) is employed to extract ECMI signals.
  • The International Geomagnetic Reference Field (IGRF) model modifies the geomagnetic gradient compensation model.

Main Results:

  • A novel compensation model integrating traditional, modified geomagnetic gradient, and ECMI compensation is developed.
  • Field experiments demonstrate superior compensation performance compared to the TLG model.
  • The proposed method effectively suppresses ECMI and geomagnetic gradient interference.

Conclusions:

  • The proposed novel compensation model offers enhanced performance in aeromagnetic detection.
  • This method provides a more accurate way to handle magnetic interferences in airborne surveys.
  • The integration of SSA and IGRF models improves the robustness of aeromagnetic compensation.