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A doppler-tolerant ultrasonic multiple access localization system for human gait analysis

journal contribution
posted on 27.10.2020, 00:00 by K Ashhar, Mohammad Khyam, CB Soh, KH Kong
Ranging based on ultrasonic sensors can be used for tracking wearable mobile nodes accurately for a long duration and can be a cost-effective method for human movement analysis in rehabilitation clinics. In this paper, we present a Doppler-tolerant ultrasonic multiple access localization system to analyze gait parameters in human subjects. We employ multiple access methods using linear chirp wave-forms and narrow-band piezoelectric transducers. A Doppler shift compensation Technique is also incorporated without compromising on the tracking accuracy. The system developed was used for tracking the trajectory of both lower limbs of five healthy adults during a treadmill walk. An optical motion capture system was used as the reference to compare the performance. The average Root Mean Square Error values between the 3D coordinates estimated from the proposed system and the reference system while tracking both lower limbs during treadmill walk experiment by 5 subjects were found to be 16.75, 14.68 and 20.20 mm respectively along X, Y and Z-directions. Errors in the estimation of spatial and temporal parameters from the proposed system were also quantified. These promising results show that narrowband ultrasonic sensors can be utilized to accurately track more than one mobile node for human gait analysis.

History

Volume

18

Issue

8

Start Page

1

End Page

20

Number of Pages

20

eISSN

1424-8220

Publisher

MDPI AG

Additional Rights

CC BY 4.0

Peer Reviewed

Yes

Open Access

Yes

Acceptance Date

25/07/2018

External Author Affiliations

Tan Tock Seng Hospital, Nanyang Technological University, Singapore;

Era Eligible

Yes

Journal

Sensors