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Now showing items 11-20 of 36
Active signal detection in shallow water using the Page test
(NATO. SACLANTCEN, 1996/11)
The use of active sonar in shallow water results in received echoes that may be considerably spread in time compared to the transmitted wave form. The duration and structure of the spreading and the time of occurrence of ...
Deconvolution by homomorphic and Wiener filtering
(NATO. SACLANTCEN, 1988/09)
This study is concerned with deconvolution methods applied to underwater propagation in shallow
Reduction of low frequency active sonar clutter through image processing
(NATO. SACLANTCEN, 1997/12)
Large numbers of false clutter detections arise in the use of low frequency active sonar for the detection of low Doppler submarine targets in shallow water. Traditional detection algorithms operate individually on each ...
Numerical simulation of the effects of bathymetry on underwater sound propagation using three-dimensional parabolic models
(NATO. SACLANTCEN, 1998/03)
Two different three-dimensional parabolic equation (PE) methods are
Bottom scattering measurements in shallow water
(NATO. SACLANTCEN, 1999/08)
Sonar performance predictions of reverberation in shallow water rely upon good estimates of the bottom scattering strength. However, little is understood about bottom scattering in shallow water in
Measurements of correlation loss and time-spreading in linear FM sweeps and pseudo-random noise signals transmitted over long ranges in shallow water
(NATO. SACLANTCEN, 1986/12)
The results of some transmission measurements made in shallow water are described. The ranges were about 15 km, 20 km, and 34 km, and the sound source was either suspended about 10 m above the bottom or was on the bottom ...
Single mode excitation, attenuation and backscatter in shallow water
(NATO. SACLANTCEN, 1995/10)
Normal mode theory is used to illustrate that a vertical array of weighted sources driven in an
Reverberation suppression
(NATO. SACLANTCEN, 1995/05)
We propose a processing methodology for shallow-water reverberation
Robust broadband matched-field processing: performance in shallow water by simulation
(NATO. SACLANTCEN, 1993/11)
An issue of concern for matched-field processing is the strong dependence between performance and
Acoustic bottom characterization of a shallow water area west of Mallorca
(NATO. SACLANTCEN, 1995/12)
An experiment was conducted in shallow water on the Balearic Shelf