The GETA Sandals: A Footprint Location Tracking System. Kenji Okuda, Shun-yuan Yeh , Chon-in Wu, Keng-hao Chang, and Hao-hua Chu National Taiwan University. What is GETA?. a kind of the traditional Japanese sandals. Outline. Motivation Related works Basic idea
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Kenji Okuda, Shun-yuan Yeh, Chon-in Wu, Keng-hao Chang, and Hao-hua Chu
National Taiwan University
(deployment, calibration, maintain)
(not succeed so far in this paper-> low infrastructure)
( 180, 200 )
( 0, 0 )
Coordinate system 2
Coordinate system 1How to sum up those vectors mathematically
Coordinate system 1’
Need coordinate transformation for each left foot step.
side viewDesign version I
d2Why using two transmitters
Can Not be rotated any more !
side viewDesign version II
Error DisplacementTwo Main Error Sources
Fig1. Ultrasonic device err
Fig2. Orientation sensor err
Adds a RFID reader in the GETA and put some tags in the environment.
Calculated Path of the user
Real Path of the user
Ultrasonic Receivers board (with 2 Ultrasonic receivers)
Ultrasonic transmitterDesign version III
The positioning error under different tag density over the walking distance.Design III Performance Evaluation
(reducing the orientation error)
or send me E-mail
Thank you !