NDLI: Hybrid ultrasound-RFID indoor positioning: Combining the best of both worlds

Content Provider	IEEE Xplore Digital Library
Author	Holm, S.
Copyright Year	2009
Description	Author affiliation: Department of Informatics, University of Oslo, P.O.Box 1080, NO-0316, Norway (Holm, S.)
Abstract	Existing hybrid ultrasound/RF positioning systems usually measure ultrasonic time-of-flight. This operation requires a wide bandwidth and this makes it rather noise sensitive, limiting the useful range. Therefore a new system is proposed where only the room-indicating capability of ultrasound is utilized and combined with RF. A portable tag obtains the room location by receiving a narrow bandwidth signal from a stationary ultrasound transmitter. The result is then relayed back over RF. This combines the high accuracy of ultrasound to pin-point exactly the room location with the high communications capacity of RF that enables tracking of hundreds of simultaneously moving tags. Secondary parameters that may aid in refining the position such as ultrasound signal level and velocity may also be measured. In addition to the increased capacity, the use of portable receivers instead of transmitters, as in ultrasound-alone indoor positioning systems, also has the advantage of reduced user exposure to ultrasound due to the larger distance to the transmitters.
Starting Page	155
Ending Page	162
File Size	324429
Page Count	8
File Format	PDF
ISBN	9781424433377
DOI	10.1109/RFID.2009.4911169
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-04-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse measurements Acoustic propagation acoustic tracking Radio frequency Ultrasonic imaging Ultrasonic variables measurement Transmitters Bandwidth Position measurement Acoustic sensors Acoustic measurements Robustness electromagnetic propagation
Content Type	Text
Resource Type	Article

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