Document Detail

Measuring time-of-flight in an ultrasonic LPS system using generalized cross-correlation.
MedLine Citation:
PMID:  22346645     Owner:  NLM     Status:  PubMed-not-MEDLINE    
In this article, a time-of-flight detection technique in the frequency domain is described for an ultrasonic local positioning system (LPS) based on encoded beacons. Beacon transmissions have been synchronized and become simultaneous by means of the DS-CDMA (direct-sequence code Division multiple access) technique. Every beacon has been associated to a 255-bit Kasami code. The detection of signal arrival instant at the receiver, from which the distance to each beacon can be obtained, is based on the application of the generalized cross-correlation (GCC), by using the cross-spectral density between the received signal and the sequence to be detected. Prior filtering to enhance the frequency components around the carrier frequency (40 kHz) has improved estimations when obtaining the correlation function maximum, which implies an improvement in distance measurement precision. Positioning has been achieved by using hyperbolic trilateration, based on the time differences of arrival (TDOA) between a reference beacon and the others.
José Manuel Villladangos; Jesús Ureña; Juan Jesús García; Manuel Mazo; Alvaro Hernández; Ana Jiménez; Daniel Ruíz; Carlos De Marziani
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-10-31
Journal Detail:
Title:  Sensors (Basel, Switzerland)     Volume:  11     ISSN:  1424-8220     ISO Abbreviation:  Sensors (Basel)     Publication Date:  2011  
Date Detail:
Created Date:  2012-02-20     Completed Date:  2012-07-12     Revised Date:  2013-05-29    
Medline Journal Info:
Nlm Unique ID:  101204366     Medline TA:  Sensors (Basel)     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  10326-42     Citation Subset:  -    
Department of Electronics, Polytechnic School, University of Alcalá, Ctra. Madrid-Barcelona Km. 33,600, Alcalá de Henares, Madrid 28805, Spain.
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