Method and system for determining the location of an item in a storage system

A system for determining the location of an RFID tagged item located in a storage system comprising a plurality of height levels and configured to contain a plurality of RFID tagged items, the system comprising:

• a plurality of antenna coils configured to be associated with one or more respective height levels of the storage system;
• an antenna controller configured to energise the antenna coils at a power level that corresponds to a received power level signal;
• and
• a processor in communication with the antenna controller, the processor configured to:
• output a plurality of power level signals to the antenna controller to selectively activate each RFID antenna coil at a plurality of different power levels;
• receive response signals from each antenna coil at each power level;
• identify each RFID tag sighted in each received response signal and recording tag sight data;
• analyse the tag sight data to determine a location of each RFID tag sighted by applying a height level bias favouring lower shelves, wherein the determined location of each RFID tag sighted comprises an item height level.