An indoor positioning system based on RFID with rotating antenna and passive tags

Radio Frequency Identification (RFID) is a rapidly developing technology especially in the field of indoor positioning. A meaningful and still unsolved problem for most applications is to develop a robust and cheap positioning system. In this paper, we developed a new positioning system based on RFID with a reader and passive tags with known location (reference tags). We adopted the approach of using a rotating antenna to obtain the relationship between Received Signal Strength (RSS) and orientation of the antenna. In addition, presented an analytical method is presented for estimating the location of the reader and a weighted average method to reduce error and the variation of error. The results show that our system had good performance and achieved the expected goals of positioning.