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

A localization method and system, including determining at least two phases associated with at least two response signals transmitted by a radio frequency identification (RFID) tag at different frequencies in response to a plurality of interrogation signals transmitted by a reader; determining a fir...

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Bibliographische Detailangaben
Hauptverfasser:	FESSLER JOHN THOMAS, WHITNEY ANN MICHELLE, 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 IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS 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 at least two phases associated with at least two response signals transmitted by a radio frequency identification (RFID) tag at different frequencies in response to a plurality of interrogation signals transmitted by a reader; determining 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 at least two response signals; based upon the first distance estimate, generating a set of phase data points that follows a substantially periodic function over a range of frequencies; and determining a second distance estimate of the distance based upon the at least two phases and the periodic function.