1,721,066 research outputs found
A Glimpse to the Future of RFID Technology Guest Editorial of the Special Issue on IEEE RFID-TA 2019 Conference
No full textIn the era of the forth industrial revolution, the need for an enforcing collaboration between industry and academia is a key issue to develop the future Radio Frequency Identification (RFID) systems. The need of interconnected people and objects open the way to new smart systems and applications, where the RFID system represents an enabling technology
RFID Robots and Vehicles for Item Inventory and Localization
No full textRadio Frequency Identification (RFID) vehicles are intensely becoming more and more pervasive in many fields concerning daily-life and work environments. This paper presents a state-of-the-art analysis of vehicles and robots adopting Ultra-High-Frequency (UHF) RFID technology. First, tagged vehicles are analysed to assess the main features and possible application scenarios. Then, vehicles equipped with UHF-RFID readers are presented with special focus on UHF-RFID robots which represent the prevailing category. Besides classical inventory operations, localization solutions are described together with novel applications in both social and industrial contexts
Method for determining the location of a moving RFID tag
No full textThere is provided a method for determining the location of an RFID tag moving along a known path with known speed. The phases of the tag response signals from successive interrogations are stored. For a given location of the tag at the time of the first reading, the phase relative to the first response changes in a characteristic way for a given distance. The set of obtained phase values (phase history) is correlated to nominal phase trend curves, each representing the phases for successive readings where the distance between the reader and the tag at the first reading had a respective particular value, i.e. a particular distance is associated with a predetermined phase change pattern. Since the trajectory and speed are known, the position at a given time is implicitly known, i.e. it can be extrapolated from the position determined for the first reading
A phase-based technique for localization of uhf-rfid tags moving on a conveyor belt: Performance analysis and test-case measurements
Full text linkA new phase-based technique for localization and
tracking of items moving along a conveyor belt and equipped with
ultrahigh frequency-radio frequency identification (UHF-RFID)
tags is described and validated here. The technique is based on
a synthetic-array approach that takes advantage of the fact that
the tagged items move along a conveyor belt whose speed and
path are known apriori. In this framework, a joint use is done
of synthetic-array radar principles, knowledge-based processing,
and efficient exploitation of the reader-tag communication signal.
The technique can be easily implemented in any conventional
reader based on an in-phase and quadrature receiver and it does
not require any modification of the reader antenna configurations
usually adopted in UHF-RFID portals. Numerical results are used
to investigate the performance analysis of such methods, and
also to furnish system design guidelines. Finally, the localization
capability is also demonstrated through a measurement campaign
in a real conveyor belt scenario, showing that a centimeter-order
accuracy in the tag position estimation can be achieved even in
a rich multipath environment
A phase-based technique for discriminating tagged items moving through a UHF-RFID gate
No full textA phase-based technique is presented for discriminating tagged items moving on a conveyor belt from other tagged items that are present in the scenario, when a UHF RFID gate is installed at a conveyor section. Indeed, tagged items (either static or randomly moving in the scenario) that are close to the reader antenna could be detected even if they are not on the conveyor (false positive readings). The classification procedure here proposed is based on some features that are extracted from a phase-based technique used to localize tags on a conveyor belt, which takes advantage of the fact that the tagged items move along a conveyor whose speed and path are both known a priori. Differently from other techniques that are used to solve the above misclassification issue, the proposed approach does not require multiple antennas
The SARFID technique for discriminating tagged items moving through a UHF-RFID gate
Full text linkThe discrimination of tagged items moving along a conveyor belt from other tagged items that are present in the scenario is investigated, when a UHF-RFID gate is installed at a conveyor section. Indeed, tagged items that are static or randomly moving in the scenario (nomad tags) around the reader antenna could be detected even if they are not on the conveyor (false positive readings). The classification procedure here proposed exploits the SARFID phase-based technique used to localize tags on a conveyor belt, which takes advantage of the fact that the tagged items move along a conveyor, whose path and instantaneous speed are both known. The latter can be implemented with only a firmware upgrade, in any conveyor belt scenario already equipped with an RFID system, without any modification of the system infrastructure and additional (reference tags/multiple antennas) or ad hoc hardware. From experimental results in a real scenario, the discrimination between moving tags from static/nomad tags can be obtained with an overall accuracy greater than 99.9%, by employing only one reader antenna
A 2D localization technique for UHF-RFID smart bookshelves
No full textA two-dimensional phase-based localization technique is applied to locate objects that are equipped with passive UHF-RFID tags and distributed on a shelf, as for example books on a bookshelf
SARFID: A phase-based localization technique for UHF RFID tags moving along arbitrary trajectories
No full textThis paper addresses the validation of a localization technique for UHF-RFID tags, which is based on a synthetic-array radar principle. Differently from previous papers where rectilinear trajectories have been assumed, here the accuracy and effectiveness of the above low-cost RFID-based localization technique are studied for more complex non-rectilinear trajectories. As an example, results are shown for a tag applied to a wheel of cars, railway vehicles, bikes, or to a rotating part of a mechanical system
A multi-antenna phase-based localization technique for moving tags
No full textA new multi-antenna approach to augment the localization of tagged items moving along a conveyor belt is presented in this paper. By exploiting a single-antenna phase-based localization technique, results acquired by two reader antennas of an RFID gate are properly combined to improve the localization accuracy even in indoor scenarios that are typically affected by strong multipath phenomena
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