Bearing estimation algorithm based on spectral analysis of the ultrasonic received echoes

Author

Diego, C. ; Hernández, A. ; Jiménez, A. ; Aparicio, J. ; García, E. ; Ruiz, D. ; Álvarez, F.

Author_Institution

Dept. of Electron., Univ. of Alcala de Henares, Alcala de Henares, Spain

fYear

2010

fDate

13-16 Sept. 2010

Firstpage

1

Lastpage

4

Abstract

A method to locate reflectors, based on the spectral analysis of ultrasonic received echoes, is provided in this study. The main contribution of this work lies in the spectral analysis for bearing estimation. A single ultrasonic transducer, acting as emitter and receiver, is used. The transmitted signal is a 1023-bits Kasami code BPSK modulated by a carrier that ranges from 30 kHz to 55 kHz, implying a 6-component transmitted pulse. Since the ultrasonic transducer works as an angle-dependent filter, it is possible to estimate the bearing angle of the reflector based on the received spectrum. It is shown how the amplitude of each frequency contains information about the environment, particularly about the bearing angle of the reflector. Finally, a set of experimental results is included to validate the sensory system, showing how it can deal with realistic reflectors.

Keywords

acoustic signal processing; direction-of-arrival estimation; echo; spectral analysis; ultrasonic transducers; ultrasonic waves; 1023-bits Kasami code BPSK; angle-dependent filter; bearing estimation algorithm; frequency 30 kHz to 55 kHz; reflectors; sensory system; spectral analysis; ultrasonic transducer; ultrasonic-received echoes;

fLanguage

English

Publisher

ieee

Conference_Titel

Emerging Technologies and Factory Automation (ETFA), 2010 IEEE Conference on

Conference_Location

Bilbao

ISSN

1946-0740

Print_ISBN

978-1-4244-6848-5

Type

conf

DOI

10.1109/ETFA.2010.5641171

Filename

5641171