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Related Experiment Videos

Calibration of position and angular data from a magnetic tracking device.

J S Day1, D J Murdoch, G A Dumas

  • 1Department of Mechanical Engineering, Queen's University, Kingston, Canada.

Journal of Biomechanics
|June 1, 2000
PubMed
Summary

This study presents a calibration method for magnetic tracking devices, improving accuracy up to 1.8m. The locally linear model enhances position and orientation data for better 3D tracking performance.

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Area of Science:

  • * Engineering and Applied Physics
  • * Robotics and Navigation Systems

Background:

  • * Magnetic tracking devices are crucial for 3D motion capture.
  • * Accuracy limitations, especially at greater distances, necessitate improved calibration techniques.

Purpose of the Study:

  • * To develop and evaluate a calibration method for magnetic tracking data.
  • * To assess the accuracy of position and orientation measurements using a Polhemus Fastrak system.

Main Methods:

  • * Collected position and orientation data within a 1.6x0.8x1.4m³ volume.
  • * Employed a locally linear model for data calibration based on measurement position.
  • * Utilized both long-range and standard transmitters with the magnetic tracking device.

Main Results:

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  • * Post-calibration, average errors were <1.8cm and <1.2 degrees up to 1.8m with the long-range transmitter.
  • * The standard transmitter showed increased errors beyond 1.2m, with accuracy <1.2cm and <1.2 degrees up to 1.2m.
  • * Noise filtering could further reduce errors, but the standard transmitter is not recommended beyond 1.2m.

Conclusions:

  • * The proposed calibration method significantly improves magnetic tracking accuracy.
  • * The long-range transmitter offers superior performance at extended distances.
  • * Magnetic tracking devices can achieve 3D accuracy comparable to video systems within the tested volume.