<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Fernando J. Álvarez</style></author><author><style face="normal" font="default" size="100%">Ureña, J.</style></author><author><style face="normal" font="default" size="100%">Manuel Mazo</style></author><author><style face="normal" font="default" size="100%">Álvaro Hernández</style></author><author><style face="normal" font="default" size="100%">J.J. Garcia</style></author><author><style face="normal" font="default" size="100%">Jose Antonio Jimenez</style></author><author><style face="normal" font="default" size="100%">Patricio Gabriel Donato</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Complementary sets of sequences-based coding for ultrasonic array sensor</style></title><secondary-title><style face="normal" font="default" size="100%">Third IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM'04)</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">ultrasonic array sensor</style></keyword><keyword><style  face="normal" font="default" size="100%">Ultrasounds</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2004</style></year><pub-dates><date><style  face="normal" font="default" size="100%">18/07/2004</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1502939</style></url></web-urls><related-urls><url><style face="normal" font="default" size="100%">https://webmail.geintra-uah.org/system/files/Complementary_sets_of_sequences.pdf</style></url></related-urls></urls><publisher><style face="normal" font="default" size="100%">IEEE Signal Processing Society</style></publisher><pub-location><style face="normal" font="default" size="100%">Sitges, España</style></pub-location><volume><style face="normal" font="default" size="100%">CD</style></volume><pages><style face="normal" font="default" size="100%">CD</style></pages><isbn><style face="normal" font="default" size="100%">07803-8546-2</style></isbn><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">In this paper, an improved ultrasonic system for detection of falling objects or alive beings intrusion in railways is presented. The basic ultrasonic array sensor is composed of four emitters and six receivers and can be easily extended to a higher coverage area repeating this elementary structure. The receivers are able to distinguish among the signals coming from the four different emitters thanks to the signal coding with complementary sets of sequences, which also gives to the reception module an excellent process gain. The signal processing has been accomplished by means of the efficient set of sequences correlator which has been recently developed by the authors.</style></abstract></record></records></xml>