Impinj, Inc.
RFID tag tracking using tag population management

Abstract:

RFID readers such as synthesized-beam readers may be used to track RFID tags of interest. When a tag of interest is detected, a reader may choose to keep the tag of interest from entering a quiet state, which a detected tag may normally enter. Subsequently, the tag of interest can respond more frequently than a tag in the quiet state, allowing the reader to track any movement of the tag of interest and determine a tag trajectory. The reader may further use the determined trajectory to cooperatively-power the tag of interest.