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Near-field electromagnetic ranging : ウィキペディア英語版 | Near-field electromagnetic ranging
Near-field electromagnetic ranging (NFER) refers to any radio technology employing the near-field properties of radio waves as a Real Time Location System (RTLS). ==Overview== Near-field electromagnetic ranging is an emerging RTLS technology that employs transmitter tags and one or more receiving units. Operating within a half-wavelength of a receiver, transmitter tags must use relatively low frequencies (less than 30 MHz) to achieve significant ranging. Depending on the choice of frequency, NFER has the potential for range resolution of 30 cm (1 ft) and ranges up to 300 m (1,000 ft).〔Mannion, Patrick. “Novel Approach to Tracking Shows Its Accuracy”. EE Times, October 25, 2004. Accessed 3/13/2007 from http://www.eetimes.com/news/latest/showArticle.jhtml?articleID=51200125〕
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