Identifying RFID Tag Moving Coherently with Reader

A method for identifying an RFID tag moving with an RFID reader, comprising:

• (a) transmitting by the reader over a period of time a plurality of reading signals at a plurality of frequencies within a transmission band;
• (b) receiving by the reader reply signals from any RFID tags within range of the reader;
• (c) determining for each reply:
• a particular RFID tag from which the reply was received;
• a received signal strength from the RFID tag;
• and
• a frequency associated therewith;
• (d) analyzing the received signal strengths and noting any correlations of signal strengths with particular RFID tags and particular frequencies;
• and
• (e) determining from the correlations whether the particular RFID tag is moving coherently with the RFID reader.

A method for identifying an RFID tag moving with an RFID reader, comprising:

• (a) transmitting by the reader over a period of time a plurality of reading signals at a plurality of frequencies within a transmission band;
• (b) receiving by the reader reply signals from any RFID tags within range of the reader;
• (c) determining over the plurality of reading signals a distribution of reading signals for which a specific RFID tag is within range of the reader;
• and
• (d) determining based on the distribution whether the particular RFID tag is moving coherently with the RFID reader.

A system for identifying an RFID tag moving with an RFID reader, comprising:

• the RFID reader, wherein said RFID reader is configured to transmit over a period of time a plurality of reading signals;
• an RF receiver associated with said RFID reader, wherein said RFID receiver is configured to receive reply signals from any RFID tags within range of the reader;
• a processor associated with said RFID reader, wherein said processor is configured to determine at least one of:
• any consistencies of a received signal strength from a particular RFID tag correlated with a period of the plurality of reading signals;
• a correlation between a signal strength received from the particular RFID tag and a particular frequency of the plurality of reading signals;
• and
• a distribution of reading signals for which the particular RFID tag is within range of the reader.