Indoor Geolocation Science and Technology书籍.pdf

NEXT-GENERATION BROADBAND WIRELESS NETWORKS AND NAVIGATION SERVICES Indoor Geolocation Science and Technology Kaveh Pahlavan and Xinrong Li, Worcester Polytechnic Institute Juha-Pekka Mäkelä, University of Oulu, Finland ABSTRACT visual supervision, to navigate the blind, to locate in-demand portable equipment in hospitals, and to This article presents an overview of the techni- find specific items in warehouses. In public safety cal aspects of the existing technologies for wire- and military applications, indoor geolocation sys- less indoor location systems. The two major tems are needed to track inmates in prisons and challenges for accurate location finding in indoor navigating policeman, fire fighters, and soldiers to areas are the complexity of radio propagation and complete their missions inside buildings. These the ad hoc nature of the deployed infrastructure incentives have initiated interest in modeling the in these areas. Because of these difficulties a vari- radio channel for indoor geolocation applications ety of signaling techniques, overall system archi- [3, 5], development of new technologies [6], and tectures, and location finding algorithms are emergence of first-generation indoor geolocation emerging for this application. This article pro- products [7]. To help the growth of this emerging vides a fundamental understanding of the issues industry, there is a n