A mobile RFID localization algorithm based on instantaneous frequency estimation

In recent years, the application demand for mobile location techniques have kept rising and the potential market is enormous. In this paper, analysis on the characteristic of receiving signal of mobile reader and time-frequency change caused by relative movement between reader and tags are performed. Then, the Doppler shift estimation method is introduced in RFID system for feature extraction of mobile targets. On the basis of that above, a mobile RFID localization algorithm based on instantaneous frequency estimation is presented. By mining the function relationship among Doppler frequency shift, speed and position of reader, the evaluation of position and speed of mobile target has been solved. The experiment results show that the location algorithm is able to meet the requirement of low complexity, less computation and real-time processing features required by mobile RFID systems.