Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Study on Vertical Velocity-Based Pre-Impact Fall Detection

수직속도 기반 충격전 낙상 감지에 관한 연구

  • Lee, Jung Keun (Department of Mechanical Engineering, Hankyong National University)
  • 이정근 (한경대학교 기계공학과)
  • Received : 2014.07.14
  • Accepted : 2014.07.27
  • Published : 2014.07.31
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Abstract

While the feasibility of vertical velocity as a threshold parameter for pre-impact fall detection has been verified, effects of sensor attachment locations and methods calculating vertical acceleration and velocity on the detection performance have not been studied yet. Regarding the vertical velocity-based pre-impact fall detection, this paper investigates detection accuracies of eight different cases depending on sensor locations (waist vs. sternum), vertical accelerations (accurate acceleration based on both accelerometer and gyroscope vs. approximated acceleration based on only accelerometer), and vertical velocities (velocity with attenuation vs. velocity difference). Test results show that the selection of waist-attached sensor, accurate acceleration, and velocity with attenuation based on accelerometer and gyroscope signals is the best in overall in terms of sensitivity and specificity of the detection as well as lead time.

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References

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