rfid reader phase ambiguity This paper demonstrates the retrieval of relative phase and RSSI from UHF RFID tag responses using a noncoherent low-cost commodity software-defined radio sniffer. Two common scenarios have been considered: (i) when the tag is stationary and (2) when the tag is moving.
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0 · Phase Ambiguity of UHF RFID
1 · Direction of Arrival (DoA) for 180 degree phase ambiguity RFID
Paul LeClair, director of the Lewiston-Auburn 911 Communications Center, explained it this way: “The 800MHz radio system — Auburn and Lewiston — police frequencies are 100-percent encrypted .
In this paper, some problems of DoA estimation will be introduced when using RFID Reader with range of 180 degree: first, coupling when placing antennas too close; second, phase ambiguity. Real experiments will also be introduced to prove the results.In this paper we introduce a phase-recovery method retrieving a 2π-periodical phase. .
The answer from Thingmagic is correct, for correct data demodulation the absolute phase is .In this paper, some problems of DoA estimation will be introduced when using RFID Reader with range of 180 degree: first, coupling when placing antennas too close; second, phase ambiguity. Real experiments will also be introduced to prove the results.The answer from Thingmagic is correct, for correct data demodulation the absolute phase is not needed, therefore many COTS rfid readers don't provide you with this information. In theory it should be possible to correct for this ambiguity by taking the received data into account.This paper demonstrates the retrieval of relative phase and RSSI from UHF RFID tag responses using a noncoherent low-cost commodity software-defined radio sniffer. Two common scenarios have been considered: (i) when the tag is stationary and (2) when the tag is moving.
In this paper we introduce a phase-recovery method retrieving a 2π-periodical phase. A larger ambiguity range for the phase measurement is beneficial for all phase-based localization methods: it allows, for example, increased array-element spacing in angle-of-arrival detection methods; and improves the resolution for imaging methods.The accurate localization of RFID tag usually uses phase di erence of arrival, that is 2p-ambiguous. We partially solve this ambiguity, up to ±2 phase cycle, by combining 865{868MHz and 915{919 MHz bands. In a dual-band experiment, distance estimates were obtained between two reader antennas and 17 tags across 6 arrays. The results revealed a new 3.07 m ambi-guity cycle due to the frequency gap, that adds to the existing 0.17 m phase ambiguity.
The phase ambiguity biases (that is the unknown number of full wavelengths between the object and the reader) related to continuous wave (CW) measurements are solved by applying a state-space model using the position, velocity and the phase offsets as components.Partial phase ambiguity solving using dual band for RFID tag localization. Mathieu Le Breton 1 and Nicolas Grunbaum 2. 1Geolithe Innov 2A liation not available. October 31, 2023. Abstract. Passive RFID tag localization has numerous applications, which can bene t . This paper investigates a new sensing paradigm derived from the measurement of the phase of the electromagnetic signals that are backscattered from the tag in the UHF-RFID band.
Phase Ambiguity of UHF RFID
This paper proposes an indoor range measurement based on multifrequency phase difference of arrival (MF-PDoA) using UHF RFID passive tags and discusses the measurement principle, experiment implementation, and results evaluation in detail.In this paper, some problems of DoA estimation will be introduced when using RFID Reader with range of 180 degree: first, coupling when placing antennas too close; second, phase ambiguity. Real experiments will also be introduced to prove the results.
The answer from Thingmagic is correct, for correct data demodulation the absolute phase is not needed, therefore many COTS rfid readers don't provide you with this information. In theory it should be possible to correct for this ambiguity by taking the received data into account.
This paper demonstrates the retrieval of relative phase and RSSI from UHF RFID tag responses using a noncoherent low-cost commodity software-defined radio sniffer. Two common scenarios have been considered: (i) when the tag is stationary and (2) when the tag is moving.
In this paper we introduce a phase-recovery method retrieving a 2π-periodical phase. A larger ambiguity range for the phase measurement is beneficial for all phase-based localization methods: it allows, for example, increased array-element spacing in angle-of-arrival detection methods; and improves the resolution for imaging methods.
The accurate localization of RFID tag usually uses phase di erence of arrival, that is 2p-ambiguous. We partially solve this ambiguity, up to ±2 phase cycle, by combining 865{868MHz and 915{919 MHz bands. In a dual-band experiment, distance estimates were obtained between two reader antennas and 17 tags across 6 arrays. The results revealed a new 3.07 m ambi-guity cycle due to the frequency gap, that adds to the existing 0.17 m phase ambiguity.The phase ambiguity biases (that is the unknown number of full wavelengths between the object and the reader) related to continuous wave (CW) measurements are solved by applying a state-space model using the position, velocity and the phase offsets as components.
Partial phase ambiguity solving using dual band for RFID tag localization. Mathieu Le Breton 1 and Nicolas Grunbaum 2. 1Geolithe Innov 2A liation not available. October 31, 2023. Abstract. Passive RFID tag localization has numerous applications, which can bene t . This paper investigates a new sensing paradigm derived from the measurement of the phase of the electromagnetic signals that are backscattered from the tag in the UHF-RFID band.
Direction of Arrival (DoA) for 180 degree phase ambiguity RFID
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rfid reader phase ambiguity|Direction of Arrival (DoA) for 180 degree phase ambiguity RFID