Methods and Systems for Estimating Distance of a Radio Frequency Identification Tag

A localization method and system, including determining phases of a plurality of response signals at a plurality of frequencies received from a radio frequency identification (RFID) tag in response to interrogation signals by a reader at the plurality of frequencies; calculating a first distance est...

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Bibliographische Detailangaben
Hauptverfasser:	FESSLER JOHN THOMAS, WHITNEY ANN MICHELLE, KRATZER ZACHARY CHARLES NATHAN, PARKER JOHNE MICHELLE, WHITNEY JULIE ANN GORDON
Format:	Patent
Sprache:	eng
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES CALCULATING COMPUTING COUNTING DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES HANDLING RECORD CARRIERS LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING MEASURING ANGLES MEASURING AREAS MEASURING ELECTRIC VARIABLES MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS MEASURING MAGNETIC VARIABLES PHYSICS PRESENTATION OF DATA RADIO DIRECTION-FINDING RADIO NAVIGATION RECOGNITION OF DATA RECORD CARRIERS TESTING
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Beschreibung
Zusammenfassung:	A localization method and system, including determining phases of a plurality of response signals at a plurality of frequencies received from a radio frequency identification (RFID) tag in response to interrogation signals by a reader at the plurality of frequencies; calculating a first distance estimate of a distance between the RFID tag and the reader based on a signal strength measured from a first response signal of the plurality of response signals; based on the phases and the first distance estimate, calculating a phase slope; and determining a second distance estimate of the distance based upon the phase slope.