A novel indoor positioning method based on key reference RFID tags

Radio Frequency Identification (RFID) technology are gaining much attention for indoor location sensing. LANDMARC was the first attempt utilizing RFID reference tags which make the system adaptable to the environment changes. However, the system suffers from some problems. For example, to further improve the localization accuracy, more reference tags are needed. This means longer latency in tracking a target because the system has to visit all reference tags when calculating the coordinates of the target. In this paper, we present a novel method to overcome the above drawbacks. We use the concept of key reference tags to eliminate redundant reference tags of the system in real time location phase. Key reference tags will help to obtain the signal strength values of all reference tags by searching a database established in off-line data collection phase. Our approach uses less RFID reference tags and will not affect the overall performance.