@conference {225, title = {Sistema de Sensores Ultrasonicos para la Detecci{\'o}n de Obstaculos basado en la Transmision de Secuencias Golay con Modulacion QPSK y Portadoras de Distinta Frecuencia}, booktitle = {Seminario Anual de Automatica, Electronica Industrial e Instrumentacion (SAAEI{\textasciiacute}04)}, volume = {1}, year = {2004}, month = {09/2004}, pages = {1-6}, chapter = {1}, address = {Toulouse, Francia}, keywords = {detecting obstacles in railways, secuencias Golay, ultrasonic array sensor}, attachments = {https://geintra-uah.org/system/files/private/Sistema_De_Sensores_Ultrasonicos_Para_La_Deteccion_De_ObstAculos_SAAEI_ALVAREZ_04.pdf}, author = {Fernando J. {\'A}lvarez and Ure{\~n}a, J. and Manuel Mazo and {\'A}lvaro Hern{\'a}ndez and J.J. Garcia and Jose Antonio Jimenez and Patricio Gabriel Donato} }