AIM (Automatic Identification Manufacturers), The Trade Association for the Automatic Identification and Data Collection (AIDC) Industry, Getting started in RFID – A Step approach (2002), http:// www.aimglobal.org/technologies/rfid/resources/ papers/rfid_basics_primer.htm
P. Bahl and V.N. Padmanabhan, RADAR: An in-building RF-based user location and tracking system, in: Proceedings of IEEE INFOCOM 2000, Tel-Aviv, Israel (March 2000), http://www.research. microsoft.com/ ~padmanab/papers/infocom2000.pdf
P. Bahl, V.N. Padmanabhan and A. Balachandran, Enhancements to the RADAR user location and tracking system, Microsoft Research Technical Report (February 2000), http://research.microsoft. com/~bahl/papers/pdf/msr-tr-2000-12.pdf
M. Chiesa, R. Genz, F. Heubler, K. Mingo, C. Noessel, N. Sopieva, D. Slocombe and J. Tester, RFID (March 2002), http://people. interaction-ivrea.it/c.noessel/RFID/research. html
Garmin Corporation, About GPS, http://www.garmin.com/ aboutGPS/
A. Harter, A. Hopper, P. Steggles, A. Ward and P. Webster, The anatomy of a context-aware application, in: Proceedings of the 5th Annual ACM/IEEE International Conference on Mobile Computing and Networking (Mobicom 1999), Seattle, WA (ACM Press, August 1999) pp. 59–68.
J. Hightower and G. Borriello, A survey and taxonomy of location sensing systems for ubiquitous computing, CSE 01-08-03, University of Washington, Department of Computer Science and Engineering, Seattle, WA (August 2001), http://www.cs.washington. edu/homes/jeffro/pubs/hightower2001survey/ hightower2001survey.pdf
J. Hightower, R. Want and G. Borriello, SpotON: An indoor 3D location sensing technology based on RF signal strength, UW CSE 00-02-02, University of Washington, Department of Computer Science and Engineering, Seattle, WA (February 2000), http:// www.cs.washington.edu/homes/jeffro/pubs/ hightower2000indoor/hightower2000indoor.pdf
J. Hightower, C. Vakili, C. Borriello and R. Want, Design and calibration of the SpotON ad-hoc location sensing system, UW CSE 00-02-02, University of Washington, Department of Computer Science and Engineering, Seattle, WA, http://www.cs.washington. edu/homes/jeffro/pubs/hightower2001design/ hightower2001design.pdf
N.B. Priyantha, A. Chakraborty and H. Balakrishnan. The Cricket location-support system, in: Proceedings of MOBICOM 2000, Boston, MA (ACM Press, August 2000) pp. 32–43.
Radio Frequency Identification (RFID) home page, http://www.aimglobal.org/technologies/rfid/
RF Code, Inc., http://rfcode.com/ProductsFrame.asp
The Bat Ultrasonic Location System, http://www.uk. research.att.com/bat/
R. Want, A. Hopper, V. Falcao and J. Gibbons, The active badge location system, ACM Transactions on Information Systems 10(1) (1992) 91–102.