Abstract
The radiofrequency identification (RFID) technology is widely used in modern industry to identify and localize the final manufactured products and their parts. This article analyses and optimizes the localization process of special RFID transponders – markers used to mark the position and type of the underground facility networks (pipes, cables, etc.). The analysis of electric circuits representing the system consisting of the marker and the localization device is performed by numerical solution of the corresponding equations. The results of the numerical solution are then used for calculation of the analytical description of the waveform received as response from the excited marker. The constants obtained from the analytical form of the solution are then used as input parameters for optimization of time window width in the correlation receiver of the marker responses. The optimization is focused on the maximization of the signal-to-noise ratio in the receiving time window. The theoretical calculations are completed by the processing of real signals recorded by an oscilloscope from the localization device where the correlation receiver is planned to apply.
Highlights
The utilization of radiofrequency identification (RFID) transponders is widely applied in today’s industry applications
It is obvious that the marker response signal can be seen in time interval \T2, N) and t2\T2, N); it can be said that t–T2 is the receive window width parameter TW according to equation (16)
The optimization of the correlation receiver window width in marker localization is forced by a difference between the application of the correlation receiver in classical data transfer and the marker localization
Summary
The utilization of radiofrequency identification (RFID) transponders is widely applied in today’s industry applications. The response amplitude is inversely proportional on the sixth power of the distance,[3] so the markers must be buried in depth no more than 1.5– 2 m. This is a very limiting factor for the signal receiver in the localization device, especially due to the noise, and this article describes an analysis of the localization process and optimization of the correlation receiver adapted for receiving the responses from the markers. In the case of the marker localization, the received marker response is the symbol with theoretically unlimited duration because the response is essentially a damped sine wave signal with attack and decay time constants, so the duration of the receiving time window must be calculated taking the maximization of signal-to-noise ratio (SNR) into account
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