is the transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. Information is carried by systematically changing (modulating) some property of the radiated waves such as amplitude, frequency, or phase.
Published in Chapter:
Description and Analysis of an Indoor Positioning System That Uses Wireless ZigBee Technology
Roberto A. Vazquez (University of Valladolid, Spain), Javier Herrero (HC Technologies, Pza Santa María, Spain), Daniel Herrero (HC Technologies, Pza Santa María, Spain), and Jaime Gómez (University of Valladolid, Spain)
Copyright: © 2010
|Pages: 25
DOI: 10.4018/978-1-61520-701-5.ch019
Abstract
Along this chapter, an indoor positioning system that uses wireless ZigBee technology is presented and evaluated. In this system, mobile wireless devices measure the level of the received signal from reference nodes, which are placed in well-known positions. With this information, the position is estimated and presented to the user in a graphical way. A precision study is presented, being this study done in function of positions and numbers of reference nodes. It is also analyzed the presence of obstacles in the system, and a study of maximum distance inter nodes that allow positioning with a minimum of quality in the results is done.