The influence of multipath propagation on phase-based narrowband positioning principles in UHF RFID

Faseth, Thomas; Winkler, Michael; Arthaber, Holger; Magerl, Gottfried

doi:10.1109/apwc.2011.6046829

Cited by 20 publications

(10 citation statements)

References 8 publications

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“…RFID technology's primary function is the identification of objects, but investigations are pushing beyond the limits of this technology to expand its capabilities, allowing localization information to be obtained from specific indoor scenarios where global positioning system (GPS) devices generally do not work. Examples of these applications are real-time location tracking with high precision via RFID tags using commercial off-the-shelf (COTS) devices [7], a standalone positioning system using low-cost passive RFID tags installed to guide the path [102], the location of tags that are not in line of sight (NLOS) for the reader [103][104][105], and navigation for autonomous mobile robots based on passive RFID tags to be applied in indoor environments [106][107][108]. Alternatively, for industrial mobile vehicles and robots, the signal strength indicator from the vehicle's transponder makes the vehicle move when RFID UHF tags are read [109,110].…”

Section: Localizationmentioning

confidence: 99%

RFID Applications and Security Review

2021

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Radio frequency identification (RFID) is widely used in several contexts, such as logistics, supply chains, asset tracking, and health, among others, therefore drawing the attention of many researchers. This paper presents a review of the most cited topics regarding RFID focused on applications, security, and privacy. A total of 62,685 records were downloaded from the Web of Science (WoS) and Scopus core databases and processed, reconciling the datasets to remove duplicates, resulting in 40,677 unique elements. Fundamental indicators were extracted and are presented, such as the citation number, average growth rate, and average number of documents per year. We extracted the top topics and reviewed the relevant indicators using a free Python tool, ScientoPy. The results are discussed in the following sections: the first is the Applications Section, whose subsections are the Internet of Things (IoT), Supply Chain Management, Localization, Traceability, Logistics, Ubiquitous Computing, Healthcare, and Access Control; the second is the Security and Privacy section, whose subsections are Authentication, Privacy, and Ownership Transfer; finally, we present the Discussion section. This paper intends to provide the reader with a global view of the current status of trending RFID topics and present different analyses from different perspectives depending on motivations or background.

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Section: Localizationmentioning

confidence: 99%

RFID Applications and Security Review

2021

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“…However, when simulating a localization system, we have to ensure a spatial correlation of the channel model in amplitude and phase in order to get realistic results. If no spatial correlation is present, the mean phase errors over all antenna elements will average each other out and the estimated localization errors will be too low [ 25 ]. A channel model that ensures a spatial correlation with a superposition of signals that originate from random directions was presented in [ 26 ].…”

Section: Simulation Environmentmentioning

confidence: 99%

Comparison of Phase-Based 3D Near-Field Source Localization Techniques for UHF RFID

Parr¹,

Miesen²,

Vossiek³

2016

Sensors

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In this paper, we present multiple techniques for phase-based narrowband backscatter tag localization in three-dimensional space with planar antenna arrays or synthetic apertures. Beamformer and MUSIC localization algorithms, known from near-field source localization and direction-of-arrival estimation, are applied to the 3D backscatter scenario and their performance in terms of localization accuracy is evaluated. We discuss the impact of different transceiver modes known from the literature, which evaluate different send and receive antenna path combinations for a single localization, as in multiple input multiple output (MIMO) systems. Furthermore, we propose a new Singledimensional-MIMO (S-MIMO) transceiver mode, which is especially suited for use with mobile robot systems. Monte-Carlo simulations based on a realistic multipath error model ensure spatial correlation of the simulated signals, and serve to critically appraise the accuracies of the different localization approaches. A synthetic uniform rectangular array created by a robotic arm is used to evaluate selected localization techniques. We use an Ultra High Frequency (UHF) Radiofrequency Identification (RFID) setup to compare measurements with the theory and simulation. The results show how a mean localization accuracy of less than 30 cm can be reached in an indoor environment. Further simulations demonstrate how the distance between aperture and tag affects the localization accuracy and how the size and grid spacing of the rectangular array need to be adapted to improve the localization accuracy down to orders of magnitude in the centimeter range, and to maximize array efficiency in terms of localization accuracy per number of elements.

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“…However, phase information is very sensitive to the propagation environment due to multipath, fading, blockage, etc. [17]. Even though researchers adopting phase-based methods claim that phase information will not be deteriorated as severely as RSSI through propagation, the problem is that a small change in phase could introduce a large error in location.…”

Section: Introductionmentioning

confidence: 97%

Item-Level RFID Tag Location Sensing Utilizing Reader Antenna Spatial Diversity

Shao

Burkholder

2013

IEEE Sensors J.

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A robust estimation procedure for sensing the locations of passive UHF radio frequency identification (RFID) tags is introduced based on spatial deployment of the reader antennas for maximum signal diversity. A signal model is developed for the received signal strength indicator seen by each reader antenna and incorporated into a mean-square error testing function. The error function is minimized at each test point in the interrogation zone to find the point with the minimum mean-square error. The minimization is independent of the tag type and orientation, making the proposed method very robust compared with other methods that are based on reference tags and radio maps. Experimental results are presented for a realistic retail scenario with multiple tagged items achieving an estimation accuracy of 35 cm. The location sensing system uses conventional UHF RFID readers, antennas, and passive tags, providing additional capability to existing item-level RFID systems. This added value will help to offset the high cost of large-scale RFID infrastructure development.

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The influence of multipath propagation on phase-based narrowband positioning principles in UHF RFID

Cited by 20 publications

References 8 publications

RFID Applications and Security Review

RFID Applications and Security Review

Comparison of Phase-Based 3D Near-Field Source Localization Techniques for UHF RFID

Item-Level RFID Tag Location Sensing Utilizing Reader Antenna Spatial Diversity

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