Evolution of mobile location-based services
Communications of the ACM - Mobile computing opportunities and challenges
Delivering real-world ubiquitous location systems
Communications of the ACM - The disappearing computer
Improving Wireless Positioning with Look-ahead Map-Matching
MOBIQUITOUS '07 Proceedings of the 2007 Fourth Annual International Conference on Mobile and Ubiquitous Systems: Networking&Services (MobiQuitous)
Attacks on public WLAN-based positioning systems
Proceedings of the 7th international conference on Mobile systems, applications, and services
Adaptive motion model for a smart phone based opportunistic localization system
MELT'09 Proceedings of the 2nd international conference on Mobile entity localization and tracking in GPS-less environments
A study of bluetooth propagation using accurate indoor location mapping
UbiComp'05 Proceedings of the 7th international conference on Ubiquitous Computing
A conceptual model of trust for indoor positioning systems
Proceedings of the 3rd ACM SIGSPATIAL International Workshop on Indoor Spatial Awareness
Proceedings of the 2nd ACM international workshop on Pervasive Wireless Healthcare
A case study of radio-based monitoring system for enhanced safety of logistics processes
SAFECOMP'12 Proceedings of the 2012 international conference on Computer Safety, Reliability, and Security
Proceedings of the Fourth ACM SIGSPATIAL International Workshop on Indoor Spatial Awareness
The impact of spatial resolution and representation on human mobility predictability
W2GIS'13 Proceedings of the 12th international conference on Web and Wireless Geographical Information Systems
Proceedings of the Fifth ACM SIGSPATIAL International Workshop on Indoor Spatial Awareness
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Enhanced-positioning systems are able to support the acquisition of accurate location information using wireless technology other than the Global Positioning System (GPS). These systems have the potential to supplement GPS where GPS is unreliable. In particular, enhanced-positioning systems can provide location information for navigational support and Location Based Services (LBS) indoors and in dense urban canyons and natural environments with extreme relief. The emergence of LBS and the widespread adoption of GPS-based navigation systems are largely a result of the accuracy with which GPS devices can determine location. The purpose of this study is to validate Wireless internet access points (WiFi APs) for determining location. A WiFi-based positioning system, tentatively called SaskEPS (Saskatchewan Enhanced Positioning System) has been developed, calibrated, and implemented for two multi-floor buildings on the University of Saskatchewan campus. Locations are calculated using four discrete steps (or sub-routines). Step 1. Creation of an accurate database of AP locations, 2. Calibration of signal strength and conversion to distance 3. Determination of line-of-sight from non-line-of-sight APs and assignment of correction factor to non-line-of-sight, and 4. Trilateration based on three or more router locations and derived distances. The results of an experiment testing the accuracy and reliability of locations calculated with the system show GPS-like accuracy with relatively low continuous (distance) and nominal (placement on correct floor of a multifloor building) uncertainty.