A Doppler-Tolerant Ultrasonic Multiple Access Localization System for Human Gait Analysis
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 a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-07-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/8/2447 |
| _version_ | 1817989832327036928 |
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| author | Karalikkadan Ashhar Mohammad Omar Khyam Cheong Boon Soh Keng He Kong |
| author_facet | Karalikkadan Ashhar Mohammad Omar Khyam Cheong Boon Soh Keng He Kong |
| author_sort | Karalikkadan Ashhar |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-14T00:52:10Z |
| format | Article |
| id | doaj.art-f24c442715094d69971385c41c9fb071 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-14T00:52:10Z |
| publishDate | 2018-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-f24c442715094d69971385c41c9fb0712022-12-22T02:21:46ZengMDPI AGSensors1424-82202018-07-01188244710.3390/s18082447s18082447A Doppler-Tolerant Ultrasonic Multiple Access Localization System for Human Gait AnalysisKaralikkadan Ashhar0Mohammad Omar Khyam1Cheong Boon Soh2Keng He Kong3School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, SingaporeDepartment of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24060, USASchool of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, SingaporeDepartment of Rehabilitation Medicine, Tan Tock Seng Hospital, 17 Ang Mo Kio Ave 9, Singapore 569766, SingaporeRanging 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.http://www.mdpi.com/1424-8220/18/8/2447motion trackingchannel multiple accessultrasonic localizationgait analysisdoppler shift compensation |
| spellingShingle | Karalikkadan Ashhar Mohammad Omar Khyam Cheong Boon Soh Keng He Kong A Doppler-Tolerant Ultrasonic Multiple Access Localization System for Human Gait Analysis Sensors motion tracking channel multiple access ultrasonic localization gait analysis doppler shift compensation |
| title | A Doppler-Tolerant Ultrasonic Multiple Access Localization System for Human Gait Analysis |
| title_full | A Doppler-Tolerant Ultrasonic Multiple Access Localization System for Human Gait Analysis |
| title_fullStr | A Doppler-Tolerant Ultrasonic Multiple Access Localization System for Human Gait Analysis |
| title_full_unstemmed | A Doppler-Tolerant Ultrasonic Multiple Access Localization System for Human Gait Analysis |
| title_short | A Doppler-Tolerant Ultrasonic Multiple Access Localization System for Human Gait Analysis |
| title_sort | doppler tolerant ultrasonic multiple access localization system for human gait analysis |
| topic | motion tracking channel multiple access ultrasonic localization gait analysis doppler shift compensation |
| url | http://www.mdpi.com/1424-8220/18/8/2447 |
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