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학술대회 An Enhanced Range Estimation Algorithm based on Trimmed WPD for Passive UHF RFID Systems
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한규원, 모상현, 양회성, 이강복
International Conference on Information and Communication Technology Convergence (ICTC) 2018, pp.967-972
18GH1700, 공간정보 기반 실감 재난관리 맞춤형 콘텐츠 제공 기술개발, 이강복
As recent RFID interrogators perform coherent detection and allow coherent signal processing, techniques based on the tag phase information are widely concerned for the range estimation. It has a problem of having ambiguities from which the measured phase alone does not interpret the distance since it is periodic. In this paper, we focus on the range estimation with ambiguous wrapped phase for indoor multipath environment. The range estimation algorithm based on trimmed wrapped phase differences(WPD) is presented to improve accuracy. We adopt the alpha-trimmed mean method on multiple frequencies to mitigate the error of wrapped phase differences. Based on the modeling of phase difference error in multipath environment, simulation results show that our algorithm has higher accuracy than classical algorithms.
alpha trimmed mean, Indoor range estimation, multipath environment, Passive UHF RFID, wrapped phase difference
KSP 제안 키워드
Coherent Detection, Multipath environment, Multiple frequency, Passive UHF RFID, Phase information, Range estimation, Trimmed mean, UHF RFID systems, Wrapped phase, coherent signal processing, estimation algorithm