A GPS/Wi-Fi/Marker Analysis Based Simultaneous and Hierarchical Multi-Positioning System

Abstract

The SHMPS system, to be presented and experimented at EvAAL 2013, is composed of, first of all a hierarchical positioning algorithm which manage a multi-positioning system composed of a GPS positioning system, a Wi-Fi based fingerprinting and trilateration system, and a marker analysis system. As soon as the latter system can provide localization information, the precedent running system switches to a learning process. The hypothesis, when running the multi-positioning system in successive outdoor and indoor environments is that the marker analysis based positioning is more accurate than Wi-Fi trilateration based one, which is more accurate than GPS' one. Our SHMPS (Simultaneous & Hierarchical Multi-Positioning System) system proposal, to compete this year to EvAAL 2013 benchmarking competition, is a stand-alone application embedded on a smart mobile device equipped with camera. This initial version associates the standard GPS application with either WIFISLAM or our OwlPS system and a natural and artificial marker analysis based on FATE or NyArtoolkit libraries. The gaps of accuracy then performed allow to switch from 8 meters outside to 4 to 5 meters inside and finally to decimeters when the instantaneous marker analysis is performing well. The hierarchical organization provides a practical way to handle the contextual download of marker information needed. © Springer-Verlag Berlin Heidelberg 2013.