Abstract: The virtual reference tags of the VIRE positioning algorithm are distributed in the central area, resulting in low positioning accuracy in non-central areas, and the algorithm needs to repeatedly adjust the threshold according to the environment, which increases the difficulty of the experiment. Aiming at the above problems, an improved VIRE algorithm for the whole region is proposed on the basis of the VIRE algorithm. Firstly, the virtual reference label is arranged in the overall positioning area. Meanwhile, the RSSI value of the virtual reference label is estimated by Newton interpolation. Then, the adjacent reference label is selected through the dynamic threshold, and the final adjacent reference label is determined after the reliability of the adjacent reference label. Finally, error correction is performed to obtain the coordinates of the positioning label. The simulation results show that the improved algorithm not only greatly improves the positioning accuracy, but also has strong adaptability to the positioning environment.

Key words: radio frequency identification(RFID), location algorithm, Newton interpolation, dynamic threshold, error correction