Self-sustaining Ultra-wideband Positioning System for Event-driven Indoor Localization
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Date
2024-01-01
Publication Type
Journal Article
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yes
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Abstract
Smart and unobtrusive mobile sensor nodes that accurately track their own position have the potential to augment data collection with location-based functions. To attain this vision of unobtrusiveness, the sensor nodes must have a compact form factor and operate over long periods without battery recharging or replacement. This paper presents a self-sustaining and accurate ultra-wideband-based indoor location system with conservative infrastructure overhead. An event-driven sensing approach allows for balancing the limited energy harvested in indoor conditions with the power consumption of ultra-wideband transceivers. The presented tag-centralized concept, which combines heterogeneous system design with embedded processing, minimizes idle consumption without sacrificing functionality. Despite modest infrastructure requirements, high localization accuracy is achieved with error-correcting double-sided two-way ranging and embedded optimal multilateration. Experimental results demonstrate the benefits of the proposed system: the node achieves a quiescent current of 47nA and operates at 1.2µa while performing energy harvesting and motion detection. The energy consumption for position updates, with an accuracy of 40cm (2D) in realistic non-line-of-sight conditions, is 10.84mJ. In an asset tracking case study within a 200qm multi-room office space, the achieved accuracy level allows for identifying 36 different desk and storage locations with an accuracy of over 95%. The system’s long-time self-sustainability has been analyzed over 700d in multiple indoor lighting situations.
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published
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Journal / series
Volume
11 (1)
Pages / Article No.
1272 - 1284
Publisher
IEEE
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Software
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Subject
Asset tracking; Energy harvesting; Energy neutrality; Indoor localization; Ultra-wideband (UWB); Internet of things (IoT); Sensor systems and applications
Organisational unit
03996 - Benini, Luca / Benini, Luca
01225 - D-ITET Zentr. f. projektbasiertes Lernen / D-ITET Center for Project-Based Learning