A backscatter-based Ultra-wideband (UWB) localization system of passive RFID tags is presented. The battery-less nodes, remotely collect energy within the UHF 865-868 MHz band, implementing the EPC Gen 2 standard protocol. Once identified, the micro-power tags perform a digital-controlled impedance modulation of the UWB antenna, acting the backscattering sequence, of the incoming emitted UWB signal, before being processed by external receivers. A dedicated signal processing algorithm and localization engine based on Time-Difference-of-Arrival (TDOA) information are exploited for a quasi-real time tags positioning. Experimental results, achieved in indoor environment, show the feasibility of centimeter-level localization accuracy. The nodes can be wirelessly switched on and localized up to 1.5 m (within the FCC mask limitations) and 2.5 m (FCC + 15 dBm) from the UWB source, with a position accuracy respectively less than 40 cm and 20 cm ( for the 70 % of cases).
Fabbri D., Decarli N., Guerra A., Romani A., Dardari D. (2020). High-Accuracy Positioning of Battery-Less Hybrid Gen2 UHF-UWB Tags [10.1109/IEEECONF51394.2020.9443433].
High-Accuracy Positioning of Battery-Less Hybrid Gen2 UHF-UWB Tags
Fabbri D.;Decarli N.;Guerra A.;Romani A.;Dardari D.
2020
Abstract
A backscatter-based Ultra-wideband (UWB) localization system of passive RFID tags is presented. The battery-less nodes, remotely collect energy within the UHF 865-868 MHz band, implementing the EPC Gen 2 standard protocol. Once identified, the micro-power tags perform a digital-controlled impedance modulation of the UWB antenna, acting the backscattering sequence, of the incoming emitted UWB signal, before being processed by external receivers. A dedicated signal processing algorithm and localization engine based on Time-Difference-of-Arrival (TDOA) information are exploited for a quasi-real time tags positioning. Experimental results, achieved in indoor environment, show the feasibility of centimeter-level localization accuracy. The nodes can be wirelessly switched on and localized up to 1.5 m (within the FCC mask limitations) and 2.5 m (FCC + 15 dBm) from the UWB source, with a position accuracy respectively less than 40 cm and 20 cm ( for the 70 % of cases).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
