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학술지 Location Error Analysis of an Active RFID-Based RTLS in Multipath and AWGN Environments
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명승일, 모상현, 양회성, 차종섭, 이형섭, 서동선
ETRI Journal, v.33 no.4, pp.528-536
한국전자통신연구원 (ETRI)
10MC2700, 실시간 위치추적 기술개발, 이형섭
In this paper, we analyze the location accuracy of realtime locating systems (RTLSs) in multipath environments in which the RTLSs comply with the ISO/IEC 24730-2 international standard. To analyze the location error of RTLS in multipath environments, we consider a direct path and indirect path, in which time and phase are delayed, and also white Gaussian noise is added. The location error depends strongly on both the noise level and phase difference under a low signal-to-noise ratio (SNR) regime, but only on the noise level under a high SNR regime. The phase difference effect can be minimized by matching it to the time delay difference at a ratio of 180 degrees per 1 chip time delay (Tc). At a relatively high SNR of 10 dB, a location error of less than 3 m is expected at any phase and time delay value of an indirect signal. At a low SNR regime, the location error range increases to 8.1 m at a 0.5 Tc, and to 7.3 m at a 1.5 Tc. However, if the correlation energy is accumulated for an 8-bit period, the location error can be reduced to 3.9 m and 2.5 m, respectively. © 2011 ETRI.
DSSS modem, Location error, RFID reader, RFID tag, RTLS
KSP 제안 키워드
Active RFID, Correlation energy, Direct path, Error analysis, Error range, International standard, Location Error, Low SNR, Phase Difference, RFID Tag, RFID reader