Precise location tracking system based on time difference of arrival over LR-WPAN

Cho, Hyuntae; Jung, Yeonsu; Choi, Hoon; Jang, Hyunsung; Son, Sanghyun; Baek, Yunju

doi:10.1145/1410012.1410028

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…When a tag is in an NLOS environment, another tag that can be detected in an LOS environment can communicate with the first tag (in the NLOS environment) and readers. This approach has been attempted to convert an NLOS environment into a LOS environment [8,31]. By utilizing the concept of assistant tags, interruptions for construction activities can be minimized and additional effort for installing reference tags or readers is not required.…”

Section: Location-tracking Error Caused By Multi-path and Nlosmentioning

confidence: 99%

“…Effective use of these characteristics of a target object can afford valuable information for filtering out location-estimation errors, and thereby improve tracking accuracy [27,30]. Consequently, some notable research has applied the movement characteristics of a target object for location sensing [29][30][31][32]. For example, Son et al [29] introduced an enhanced asset locating system for vehicle pooling in a port terminal by using the information on the range and speed of a transfer crane.…”

Section: Algorithm Development To Overcome Multi-pathmentioning

confidence: 99%

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Accuracy Improvement of Real-Time Location Tracking for Construction Workers

Kim

Han

2018

Sustainability

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Extensive research has been conducted on the real-time locating system (RTLS) for tracking construction components, including workers, equipment, and materials, in order to improve construction performance (e.g., productivity improvement or accident prevention). In order to prevent safety accidents and make more sustainable construction job sites, the higher accuracy of RTLS is required. To improve the accuracy of RTLS in construction projects, this paper presents a RTLS using radio frequency identification (RFID). For this goal, this paper develops a location tracking error mitigation algorithm and presents the concept of using assistant tags. The applicability and effectiveness of the developed RTLS are tested under eight different construction environments and the test results confirm the system's strong potential for improving the accuracy of real-time location tracking in construction projects, thus enhancing construction performance.

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Section: Location-tracking Error Caused By Multi-path and Nlosmentioning

confidence: 99%

Section: Algorithm Development To Overcome Multi-pathmentioning

confidence: 99%

Accuracy Improvement of Real-Time Location Tracking for Construction Workers

Kim

Han

2018

Sustainability

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“…A received signal strength indicator (RSSI) [3] is the most conventional approach. Some research methods have used time based techniques such as time of arrival (TOA) [4] or time difference of arrival (TDOA) [5] between readers and a tag. The angle of arrival (AOA) [6] approach has also been proposed to estimate position.…”

Section: A Rtlsmentioning

confidence: 99%

Robustness of Distributed RTLS for Dense Large-Scale Environments

Jang

Choi

Jung

et al. 2010

2010 Seventh International Conference on Information Technology: New Generations

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RTLS (Real Time Locating Systems) are used to track the location of an object or person in real time. However, if there are many tags and readers, the conventional centralized RTLS server with a single location engine may fail to estimate the location of the tags. Furthermore, if the server does not receive a tag's signal due to pass loss or none line-ofsight (NLOS) from more than three readers, the server fails to estimate the location of the tag. In this paper, we propose a special reader that incorporates an RTLS location engine for distributed RTLS. Furthermore, we use a multidirectional antenna array, alleviating the multipath effect and allowing estimation of a tag's location using only two readers. To assess the performance of the system, we implement an entire RTLS system based on IEEE 802.15.4a. The experiment results show that the distributed RTLS enhances the location response time and reduces network confusion. Moreover, we can obtain the tag's location with only two readers using directional information.

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