Abstract
RFID positioning system plays an important role in the management of electronic tag lifecycle and safety monitoring. The traditional estimation methods for electronic tag emission power are relatively low in precision and require setting large numbers of reference tags. Therefore, a new method of electronic tag emission power estimation in the RFID positioning system is proposed in this paper. In the electronic tag of the RFID positioning system, it is required that the radio link between the reader and the electronic tags should pass through the air and electronic tags. And the path loss mainly includes the reflection loss between the air-electronic tags interface and attenuation in the electronic tags. Based on the boundary conditions between the electronic tag emission frequency and the air-electronic tag interface, comparison measurement method for the electronic tag emission frequency of the open-ended coaxial probe is used to establish the electronic tag emission power estimation model in the RFID positioning system. The numerical analysis shows that the used electronic tag emission frequency comparison measurement has small measurement error, with the absolute value of the measured and simulated reflection coefficient difference less than 0.04. This algorithm has improved the precision of the measured emission power, reduced the work load for setting reference tags, and also provided a reference for the design of electronic tag monitoring system in the RFID positioning system.
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