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An Adaptive Alternating Magnetic Interference Suppression (AAIS) Algorithm for Geomagnetic Vector Measurement.

Weilin Wang1, Keyan Li1, Zhihao Yang1

  • 1School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.

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|May 28, 2022
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Summary
This summary is machine-generated.

This study introduces an adaptive alternating magnetic interference suppression (AAIS) algorithm to improve geomagnetic vector measurements. The AAIS algorithm effectively detects and suppresses magnetic interference without reference sensors, enhancing measurement accuracy.

Keywords:
alternating magnetic interferenceelectrical equipmentgeomagnetic vector measurement

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Area of Science:

  • Geophysics
  • Sensor Technology
  • Signal Processing

Background:

  • High-precision geomagnetic field vector measurements are crucial for various applications.
  • Alternating magnetic interference (AMI) from electrical equipment significantly degrades measurement accuracy.
  • Existing methods often require reference sensors or are less effective against diverse interference.

Purpose of the Study:

  • To develop an effective algorithm for suppressing alternating magnetic interference (AMI) in geomagnetic vector measurements.
  • To improve the accuracy of geomagnetic field vector detection without relying on external reference sensors.
  • To provide a robust solution for airborne, vehicle-mounted, and shipborne geomagnetic detection systems.

Main Methods:

  • Proposed the adaptive alternating magnetic interference suppression (AAIS) algorithm.
  • Utilized a triaxial fluxgate sensor for magnetic field data acquisition.
  • Employed short-time Fourier and wavelet transforms for time-frequency analysis of AMI.
  • Implemented a triaxial adaptive notch filter for interference suppression.

Main Results:

  • The AAIS algorithm successfully detected AMI frequencies from the total magnetic field.
  • The algorithm adaptively fitted the amplitude and phase of AMI on the vector magnetic field.
  • AAIS effectively suppressed interference across various frequencies, numbers, and intensities.
  • Simulation and experimental results validated the algorithm's effectiveness.

Conclusions:

  • The AAIS algorithm significantly improves geomagnetic vector measurement accuracy by compensating for errors caused by AMI.
  • The method is effective without requiring reference sensors, making it versatile for different platforms.
  • AAIS offers a practical solution for enhancing geomagnetic detection in dynamic environments.