Relative Positioning System Using Acoustic Sensors for Ubiquitous Computing Applications

DE MARZIANI, C.; UREÑA, J.; HERNÁNDEZ, A.; MAZO, M.; JIMENEZ, A.; ALVAREZ, F.; VILLADANGOS, J. M.

CEUR Workshop Proceedings

Universidad de Alcalá

Año: 2005 vol. 132 p. 1 - 11

1613-0073

Systems that characterize the state of an entity or object are very important in the ?smart spaces? and ?ubiquitous computing?; this information is usually known as the entity?s "context". Those applications, which describe or characterize these entities and interact with it, are often referred as "context-aware computing". One of the most important information is the position of an object with the purpose of offering the most suitable services to him. The mechanisms and techniques that determine these space relations are named ?location"; and the computing applications, based on the position, are called ?location-aware computing?. This article presents an indoor localization system in order to make a relative positioning among entities, fixed or mobile, without use an external infrastructure and only using acoustic transducers for their use in ubiquitous computing applications. Also, an analysis of the positioning algorithm, based on multidimensional scaling technique (MDS), is carried out in order to verify the errors in the position estimation when there are errors in the mechanism of ranging distances.