Title :
Time-frequency analysis applied to sandy bottom echoes
Author :
Dalachartre, P. ; Vray, D. ; Peyrin, F. ; Dziedzic, A. ; Gimenez, G.
Author_Institution :
Lab. de Traitement du Signal et Ultrasons, CNRS, Villeurbanne, France
Abstract :
An analysis of bottom acoustic echoes by means of time-frequency representation is presented. The use of a chirped transmitting signal with a large time bandwidth product leads to the implementation of such a representation. The pseudo-Wigner distribution function (PWDF) provides a useful indication of the signal concentration and the spreading over time and frequency, and yields an interpretation of the bottom acoustic behavior
Keywords :
acoustic signal processing; echo; sonar; spectral analysis; time-frequency analysis; underwater sound; bottom acoustic echoes; chirped transmitting signal; large time bandwidth product; pseudo-Wigner distribution function; sandy bottom echoes; time-frequency representation; wideband sonar; Bandwidth; Calibration; Cameras; Chirp modulation; Distribution functions; Lakes; Reverberation; Sonar measurements; Time frequency analysis; Wideband;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.275985
