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Broadband matched-field processing of transient signals in shallow water
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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 within the source signal frequency band. Results obtained with this processor on short transient pulses collected in the North ElbaI. area in 1989 with a 62m aperture vertical array, showed stable and accurate localizations over long time intervals. These results also demonstrate that 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.
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S.M. JESUS ``Broadband matched-field processing of transient signals in shallow water'', Proceedings of the First European Conference on Underwater Acoustics, European Comission, pp. 582-585.