Velocity Analysis for UHF RFID Vehicle License Plate

Ultra-high-frequency radio frequency identification (RFID UHF) vehicle license plate is a promising technology for traffic management because of its special advantages. In practical applications, the reading effect is closely related to the vehicle velocity. This paper analyzed the effective vehicle velocity for the steadily reading of the UHF RFID vehicle license plate. The smallest time for one single tag to be effectively read, the relationship between the tags reads and the vehicle velocity, the maximum vehicle velocity to be effective read, are analyzed and measured. Measurement results were in good agreement with the theoretical analysis. Studies have shown that the reading stability of the UHF RFID vehicle license plate is closely related to the effective read range of RFID tags, readers reading cycle and the vehicle velocity. In general vehicle velocity, UHF RFID vehicle license can be effectively read.