TY - CONF T1 - Complementary sets of sequences-based coding for ultrasonic array sensor T2 - Third IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM'04) Y1 - 2004 A1 - Fernando J. Álvarez A1 - Ureña, J. A1 - Manuel Mazo A1 - Álvaro Hernández A1 - J.J. Garcia A1 - Jose Antonio Jimenez A1 - Patricio Gabriel Donato KW - ultrasonic array sensor KW - Ultrasounds AB - 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. JF - Third IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM'04) PB - IEEE Signal Processing Society CY - Sitges, España VL - CD SN - 07803-8546-2 UR - http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1502939 ER -