A Shoe-Embedded RF Sensor for Motion Detection

Author

Zhou, Chenming ; Downey, James ; Choi, Jaewon ; Stancil, Daniel ; Paramesh, Jeyanandh ; Mukherjee, Tamal

Author_Institution

Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

21

Issue

3

fYear

2011

fDate

3/1/2011 12:00:00 AM

Firstpage

169

Lastpage

171

Abstract

Inertial Measurement Unit (IMU) based pedestrian navigation systems suffer from long term inaccuracy due to sensor bias drift. Zero velocity update (ZUPT) algorithms can estimate the drift and improve the system accuracy. Accurate zero velocity period detection is critical for the performance of ZUPT algorithms. A low power shoe-embedded RF sensor is proposed to identify zero velocity periods of a foot when a person is walking. This letter reports the hardware system development and the performance characterizations. The results show that the sensor can detect relative position changes with an accuracy of better than 1.3 mm and a velocity as low as 191 μm/s. The developed miniature sensor was embedded into the heel, and zero velocity periods were successfully detected during walking tests.

Keywords

inertial navigation; inertial systems; microsensors; microwave detectors; motion estimation; ZUPT algorithms; inertial measurement unit; motion detection; pedestrian navigation systems; sensor bias drift; shoe embedded RF sensor; zero velocity update; Accuracy; Clutter; Legged locomotion; Mixers; Navigation; Radio frequency; Receivers; Direct conversion receiver; inertial navigation; positioning and velocity sensor; zero velocity update (ZUPT);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2010.2103052

Filename

5711000