Delivering real-world ubiquitous location systems
Communications of the ACM - The disappearing computer
Accuracy characterization for metropolitan-scale Wi-Fi localization
Proceedings of the 3rd international conference on Mobile systems, applications, and services
A critical evaluation of location based services and their potential
Journal of Location Based Services
Attacks on public WLAN-based positioning systems
Proceedings of the 7th international conference on Mobile systems, applications, and services
Improvement of RFID based location fingerprint technique for indoor environment
ISCIT'09 Proceedings of the 9th international conference on Communications and information technologies
Compressive sensing based positioning using RSS of WLAN access points
INFOCOM'10 Proceedings of the 29th conference on Information communications
WiFi-based enhanced positioning systems: accuracy through mapping, calibration, and classification
Proceedings of the 2nd ACM SIGSPATIAL International Workshop on Indoor Spatial Awareness
Ultra wideband indoor positioning system in support of emergency evacuation
Proceedings of the Fifth ACM SIGSPATIAL International Workshop on Indoor Spatial Awareness
Proceedings of the Fifth ACM SIGSPATIAL International Workshop on Indoor Spatial Awareness
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Much effort has been expended to develop and improve indoor positioning. Many wireless sensor technologies have been used for indoor positioning systems; however WiFi has been the most widely employed sensor system as an alternative to Global Positioning System (GPS). Many commercial indoor positioning services such as those developed for and available on Apple and Android systems are hardly satisfying users' demand, primarily because of their inaccurate positioning. The Saskatchewan Enhanced Positioning System (SaskEPS) has been developed to provide reliable indoor positioning as a complement to GPS. SaskEPS successfully produces very reliable 2.5-Dimensional positioning (X-Y and floor) information at randomly selected fixed locations across an extensive indoor environment at the University of Saskatchewan. SaskEPS produces GPS-like positioning accuracy (sub 10 metre error) during testing; however there are several additional limitations that reduce the ability of non-GPS systems to provide accurate and reliable positioning indoors as compared to GPS. SaskEPS and other trilateration-based WiFi-based Positioning Systems can improve their positioning abilities with techniques commonly used in GPS-based positioning systems; therefore, SaskEPS has integrated a map-matching technique (Post-positioning correction) with its trilateration-based algorithm (Pre-positioning determination). In this paper we explore some limitations for WiFi-based indoor positioning with an explicit examination of SaskEPS in a complex multi-building environment. As well, some add-on localization functionalities are tested for reducing positioning errors and increasing reliability of SaskEPS.