The experimental analysis of outdoor positioning system based on fingerprint approach

In recent years, the demand of ubiquitous computing and location-based services (LBS) has risen. The most challenge in LBS is the location of mobile terminals. Existing location techniques have poor performance in urban environments due to severe multipath and NLOS propagation. Fingerprint localization based on wireless-LAN (WLAN) has been preferred for those types of environments. Although location fingerprinting has been researched in some previous works, there are only few studies that investigate the performance of outdoor positioning system according to physical parameters and the underlying environment. In this paper, we present an experimental analysis for outdoor fingerprinting system, implemented over the WLAN. On the basis of this experimental analysis, we demonstrate that it is indeed feasible to perform outdoor locating with reasonable accuracy using 802.11-based positioning. Secondly, we further work out certain crucial control parameters, which we can adopt to different cases and scenario, to achieve better positioning accuracy.