Object location system and method using RFID

Details Object location system and method using RFID Object location system and method using RFID

2006-10-10

2006-10-10

Lobo, Ian J. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Determining distance

With frequency modulation

C342S042000, C342S118000, C342S145000, C340S686100, C340S572100, C340S870030

Reexamination Certificate

active

07119738

ABSTRACT:
A system and method is provided for locating objects using RFID tags. The system and method uses an RFID reader and a distance calculator to efficiently and accurately determine the location of objects that include an RFID tag. The RFID reader transmits a plurality of signals to the RFID tag, with the plurality of signals having different fundamental frequencies. In response, the RFID tag backscatter modulates the plurality of transmitted signals to create a plurality of backscatter modulated signals. The RFID reader receives and demodulates the plurality of backscatter modulated signals. The distance calculator determines the phase of the plurality of backscatter modulated signals and determines a rate of change of the phase in the backscatter modulated signals with respect to the rate of change in the fundamental frequency of the transmitted signals and uses this information to calculate the distance to the RFID tag.

REFERENCES:
patent: 6356230 (2002-03-01), Greef et al.
patent: 6414626 (2002-07-01), Greef et al.
patent: 6577238 (2003-06-01), Whitesmith et al.
patent: 6618449 (2003-09-01), Laviec et al.
patent: 6903656 (2005-06-01), Lee
patent: 6950009 (2005-09-01), Nysen
patent: 2002/0160787 (2002-10-01), Chen et al.
patent: 2005/0049832 (2005-03-01), Gorinevsky
patent: 2005/0099318 (2005-05-01), Gilfix et al.

Affiliated with

Also associated with

Rating

Object location system and method using RFID does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Object location system and method using RFID, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Object location system and method using RFID will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3692419