Abstract: As current RFID positioning system can only provide a single location based servcie and low localization accuracy for interferring each other in an area where deploying a large number of RFID devices,the paper proposed a RFID positioning system construction method which is using classical signal propagation model to construct a virtual reference tags in position area,and then designed a mobile object positioning menthod based on virtual reference tags space. The experiment results show that the method may enhance positiong accuracy and overcome the interference problems caused by deploying a lot of reference tags and reader, positioning accuracy in the central region to reach 0.31m~1.65m,between the error in the external region between 1.48m~3.72m.

Key words: RFID, Positioning system, Reference tag, System construction