Abstract
Abstract While the feasibility of vertical velocity as a threshold parameter for pre-impact fall detection has been verified, effects of sensorattachment 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 casesdepending on sensor locations (waist vs. sternum), vertical accelerations (accurate acceleration based on both accelerometer and gyro-scope vs. approximated acceleration based on only accelerometer), and vertical velocities (velocity with attenuation vs. velocity dif-ference). Test results show that the selection of waist-attached sensor, accurate acceleration, and velocity with attenuation based onaccelerometer and gyroscope signals is the best in overall in terms of sensitivity and specificity of the detection as well as lead time.Keywords: Pre-impact fall detection, Vertical velocity, Inertial sensor, Accelerometer, Gyroscope
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