Ultra-wideband positioning sensor with application to an autonomous ultraviolet-c disinfection vehicle
Journal
Sensors
Journal Volume
21
Journal Issue
15
Pages
5223
Date Issued
2021
Author(s)
Huang S.-P.
Neo J.-F.
Chen Y.-Y.
Chen C.-B.
Wu T.-W.
Peng Z.-A.
Tsai W.-T.
Liou C.-Y.
Abstract
Due to the COVID-19 virus being highly transmittable, frequently cleaning and disinfecting facilities is common guidance in public places. However, the more often the environment is cleaned, the higher the risk of cleaning staff getting infected. Therefore, strong demand for sanitizing areas in automatic modes is undoubtedly expected. In this paper, an autonomous disinfection vehicle with an Ultraviolet-C (UVC) lamp is designed and implemented using an ultra-wideband (UWB) positioning sensor. The UVC dose for 90% inactivation of the reproductive ability of COVID-19 is 41.7 J/m2, which a 40 W UVC lamp can achieve within a 1.6 m distance for an exposure time of 30 s. With this UVC lamp, the disinfection vehicle can effectively sterilize in various scenarios. In addition, the high-accuracy UWB positioning system, with the time difference of arrival (TDOA) algorithm, is also studied for autonomous vehicle navigation in indoor environments. The number of UWB tags that use a synchronization protocol between UWB anchors can be unlimited. Moreover, this proposed Gradient Descent (GD), which uses Taylor method, is a high-efficient algorithm for finding the optimal position for real-time computation due to its low error and short calculating time. The generalized traversal path planning procedure, with the edge searching method, is presented to improve the efficiency of autonomous navigation. The average error of the practical navigation demonstrated in the meeting room is 0.10 m. The scalability of the designed system to different application scenarios is also discussed and experimentally demonstrated. Hence, the usefulness of the proposed UWB sensor applied to UVC disinfection vehicles to prevent COVID-19 infection is verified by employing it to sterilize indoor environments without human operation. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Subjects
COVID-19; Disinfection vehicle; Ultra-wideband; Ultraviolet-C; Wireless positioning
SDGs
Other Subjects
Computational efficiency; Disinfection; Gradient methods; Indoor positioning systems; Navigation; Navigation systems; Time difference of arrival; Vehicles; Viruses; Application scenario; Autonomous navigation; Autonomous vehicle navigation; Planning procedure; Real-time computations; Reproductive ability; Synchronization protocols; Uv-c disinfections; Ultra-wideband (UWB); algorithm; disinfection; human; methodology; Algorithms; COVID-19; Disinfection; Humans; Research Design; SARS-CoV-2
Publisher
MDPI AG
Type
journal article