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Delivering real-world ubiquitous location systems

Borriello, G. and LaMarca, A. and Chalmers, M. and Nixon, P. (2005) Delivering real-world ubiquitous location systems. Communications - ACM, 48 (3). pp. 36-41. ISSN 0001-0782

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Abstract

A large number of research and commercial location systems havebeen developed over the past twodecades [7]. In general, these systems have one of two goals: providing highly accurate location estimates, on the order of centimeters, within a small area, or provid-ing lower accuracy over a widecoverage area [8]. Systems with afocus on accuracy typically requireboth extensive infrastructure andrelatively expensive sensors. AT&TCambridge's Active Bats [1] system, for example,employs active ultrasonic badges and requires theinstallation of ceiling-mounted ultrasound receiversevery square meter.