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The Radio Frequency Identification (RFID) is a rapidly developing technology with growing applications in several fields. One of the key applications is the localisation of tagged objects using signal phase difference information via dual-frequency technology. In this application, unwrapping signal phases to acquire the range between the reader and RFID tag is the major issue that has typically been...
Use of the phase of a signal to measure distance carries an inherent ambiguity. The problem is typically addressed by the use of several different frequencies and the Chinese Remainder Theorem or lattice methods, but these methods result in computational complexity issues. The difficulties are increased by the presence of noise. This paper presents a lattice-based algorithm to resolve phase ambiguity...
The ambiguous range measurements is a key issue in sensor localization. The underlying distance ambiguity problem was addressed using both Chinese reminder theorem and lattice theory in literature. In this paper, we propose a fast and efficient algorithm to solve this distance ambiguity problem as an extension of our previous work in lattice approach [3]. We show that 1) the co-prime condition for...
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