Patent ID: 8294554

Claim:
A method of locating radio frequency identification (RFID) tags using first, second, and third RFID readers, the method comprising: transmitting a single radio frequency (RF) signal at a particular time from the first RFID reader to a tag to be located; receiving, at each of the first, second, and third RFID readers, a signal backscattered off the tag from the single RF signal transmitted by the first RFID reader; extracting at least one measured position parameter from said signal backscattered off the tag and received at the first, second, and third RFID readers; and determining a location of the tag using the measured position parameters extracted from the signal backscattered off the tag from the single RF signal transmitted at the particular time from the first RFID reader, wherein all measured position parameters used in determining the location of the tag are extracted from said signal backscattered off the tag from said single transmission at said particular time from the first RFID reader.