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Accurate estimation of airborne ultrasonic time-of-flight for overlapping echoes

Abstract: In this work, an analysis of the transmission of ultrasonic signals generated by piezoelectric sensors for air applications is presented. Based on this analysis, an ultrasonic response model is obtained for its application to the recognition of objects and structured environments for navigation by autonomous mobile robots. This model enables the analysis of the ultrasonic response that is generated using a pair of sensors in transmitter-receiver configuration using the pulse-echo technique. This is very interesting for recognizing surfaces that simultaneously generate a multiple echo response. This model takes into account the effect of the radiation pattern, the resonant frequency of the sensor, the number of cycles of the excitation pulse, the dynamics of the sensor and the attenuation with distance in the medium. This model has been developed, programmed and verified through a battery of experimental tests. Using this model a new procedure for obtaining accurate time of flight is proposed. This new method is compared with traditional ones, such as threshold or correlation, to highlight its advantages and drawbacks. Finally the advantages of this method are demonstrated for calculating multiple times of flight when the echo is formed by several overlapping echoes.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Sarabia E., Llata J., Robla S., Torre C., Oria J.,

 Fuente: Sensors, 2013, 13(11), 15465-15488

Editorial: MDPI

 Fecha de publicación: 01/11/2013

Nº de páginas: 24

Tipo de publicación: Artículo de Revista

 DOI: 10.3390/s131115465

ISSN: 1424-8220

Proyecto español: DPI2006-15313 ; DPI2012-36959