Broadband matched-field processing of transient signals in shallow water

S.M. Jesus
Saclant Undersea Research Centre
Viale San Bartolomeo 400,
19138 La Spezia, Italy

Comments: download pdf file .
Ref.: in Proc. of the First European Conference on Underwater Acoustics (ISBN 185166-948-5), Luxembourg, pp. 582-585, 1992.

Abstract: This paper presents a full-wavefield narrowband high resolution technique that uses the spectral decomposition of the sample covariance matrix to resolve the vertical arrival structure of the harmonic acoustic field. The broadband processor is obtained by weighted averaging of the narrowband range-depth ambiguity estimates wihtin the source signal frequency band. Results obtained with this processor on short transient pulses collected in the North Elba I. are in 1989 with a 62 m aperture vertical array, showed stable and accurate localizations over long time intervals. These results also demonstrate tha the sound field, received over a given frequency band, is relatively stable over time  and is in agreement with the predictions given by a standard normal-mode propagation model.

ACKNOWLEDGMENT: this work was partially supported by the EU project MAS2-CT920022.