Abstract
How to position a tag is an important and sometimes necessary task for many RFID applications. Traditionally, there are methods using RSS and Phase to ranging a tag in literatures. But in this paper we introduce the principles of multi-tones phase of arrival (POA) based ranging in detail, and firstly compare POA and time of arrival (TOA) based ranging behavior for RFID application in a certain scenario. We characterize the RFID ranging behaviors from the view of Cramer–Rao lower bound (CRLB), Ray Tracing and empirical measurements. First, we introduce the principles of multi-tone POA ranging method, and present the details of POA based ranging CRLBs for different tones and compare it with TOA ranging. Second, we use Ray Tracing method to model the distance and bandwidth influence on POA and TOA based RFID ranging in multipath environments. Third, we establish measurement in a room to validate the noise and multipath influence on POA and TOA based RFID ranging. The ray tracing simulation and empirical experiment results show that in short range application such as RFID, POA based ranging has a comparatively better performance than TOA.
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