title: Infrared sensor system for mobile-robot positioning in intelligent spaces.
abstract: The aim of this work was to position a Mobile Robot in an Intelligent Space, and this paper presents a sensorial system for measuring differential phase-shifts in a sinusoidally modulated infrared signal transmitted from the robot. Differential distances were obtained from these phase-shifts, and the position of the robot was estimated by hyperbolic trilateration. Due to the extremely severe trade-off between SNR, angle (coverage) and real-time response, a very accurate design and device selection was required to achieve good precision with wide coverage and acceptable robot speed. An I/Q demodulator was used to measure phases with one-stage synchronous demodulation to DC. A complete set of results from real measurements, both for distance and position estimations, is provided to demonstrate the validity of the system proposed, comparing it with other similar indoor positioning systems.
authors.affiliation: Department of Electronics, University of Alcalá, Alcalá de Henares, Madrid, 28801, Spain. ernesto@depeca.uah.es
authors.forename: Ernesto Martín
authors.initials: EM
authors.lastname: Gorostiza
authors.forename: José Luis Lázaro
authors.initials: JL
authors.lastname: Galilea
authors.forename: Franciso Javier Meca
authors.initials: FJ
authors.lastname: Meca
authors.forename: David Salido
authors.initials: DS
authors.lastname: Monzú
authors.forename: Felipe Espinosa
authors.initials: FE
authors.lastname: Zapata
authors.forename: Luis Pallarés
authors.initials: LP
authors.lastname: Puerto
mesh_terms: D003198:Computer Simulation; D007259:Infrared Rays; D012371:Robotics