Geodesic
Study of reverberation pattern and its cancellation method in shallow water
Theoretical and applied mechanics, Tome 34 (2007) no. 3.

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In shallow water, the primary limitation of the performance of active sonar is the reverberation that originates from volume and boundaries scattering as well as multi-path propagation. Therefore, reverberation cancelation is an important research topic for increasing the performance of active sonar in shallow water. In this research, the reverberation pattern is simulated using MATLAB software. The simulated frequency is 30-kHz in the research. There are two main aims of this work. The flrst is to create the signals that include the reverberation and the target. The second is to perform the reverberation cancelation for the active sonar in shallow water. The analysis of the reverberation for the spherical target is based on the propagation theory of image source, surface scattering of Rayleigh criterion of roughness, bottom scattering of Lambert’s Law, and multiple scattering. The signal containing the reverberation and the target is then compressed or enhanced by AGC (Automatic Gain Control). The echo of the target is then distinguished through the method of cross correlation. The following phenomena can be found: (a) AGC can compress the signal in a speciflc dynamic range. (b) cross correlation can be used to locate and distinguish the echoes of the target in a high reverberation environment.
Keywords: reverberation, shallow water, AGC, cross correlation, image source 
@article{TAM_2007_34_3_a0,
     author = {Shiuh-Kuang Yang and Shih-Ming Chiu and Ruey-Chang Wei},
     title = {Study of reverberation pattern and its cancellation method in shallow water},
     journal = {Theoretical and applied mechanics},
     pages = {173 - 195},
     publisher = {mathdoc},
     volume = {34},
     number = {3},
     year = {2007},
     url = {http://geodesic.mathdoc.fr/item/TAM_2007_34_3_a0/}
}
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Shiuh-Kuang Yang; Shih-Ming Chiu; Ruey-Chang Wei. Study of reverberation pattern and its cancellation method in shallow water. Theoretical and applied mechanics, Tome 34 (2007) no. 3. http://geodesic.mathdoc.fr/item/TAM_2007_34_3_a0/