About: http://webisa.webdatacommons.org/328865681

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	For an RFID device or other device which can transmit or generate a return signal at two or more frequencies, it is conceivable that the distance to the RFID device from the antenna can be determined applying a known phase relationship.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com