A mobile sensor system and method for managing inventory of a store includes at least one radio frequency identification (RFID) scanner for receiving readings from RFID tags, at least one external sensors for detecting at least one external events other than RF signals from the RFID tags, and a processor configured to update an RFID database for storing the readings from the RFID tags, wherein the update is based on a correlation function of the readings from the RFID tags and the external events detected at the at least one external sensors.