GETA sandals: A footstep location tracking system

  • Yeh S
  • Chang K
  • Wu C
 et al. 
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This paper presents the design, implementation, and evaluation of
a footstep based indoor location system. The traditional Japanese
GETA sandals are equipped with force, ultrasonic, orientation, RFID
sensors and an accelerometer to produce a wearable location tracking
system that demand little infrastructure in the deployed environment.
In its basic form, a user simply puts on GETA sandals to enable tracking
of his/her locations relative to a starting point (e.g., a building
entrance), making it easy for deployment everywhere. The footstep
location system is based on dead-reckoning, which works by measuring
and tracking displacement vectors along a trail of footsteps. Each
displacement vector is formed by drawing a line between each pair
of footsteps, and the position of a user can be calculated by summing
up the current and all previous displacement vectors. Unlike most
existing indoor location systems, the footstep based method does
not suffer from problems with obstacles, multi-path effects, signal
noises, signal interferences, and dead spots. There are two technical
challenges in the proposed design: (1) location error accumulates
over distance traveled, and (2) displacement measurements are sporadic
during stair climbing. The first problem is addressed by a light
RFID infrastructure, while the second problem is remedied by incorporating
an accelerometer into the system. Experiments on GETA prototype are
conducted to evaluate the positional accuracy of our system.

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  • Shun Yuan Yeh

  • Keng Hao Chang

  • Chon In Wu

  • Hao Hua Chu

  • Jane Yung Jen Hsu

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