Abstract
In the MCM (Mine Counter Measure) context, a lot of effort has been put in imagery systems. The last generation of sonar, SAS (Synthetic Aperture Sonar) system, has been developed in the last 10-5 years and provided a new powerful tool for mines detection, identification and classification.
This paper investigates the image formation process of an object for low frequency SAS system. We will study the image forma- tion process of simple targets in free water. Adding a boundary to the problem (seabed) breaks the symmetry of the problem and the Helmoltz-Kirchhoff equation has to be approximated in order to be solved. Comparing the solution of the equation with real SAS images, it appears that the target boundaries and texture cannot be explained via this method. In this paper we introduce a co- herent perturbation of the Green derivative function present in the Helmoltz-Kirchhoff model to model the reflection by a fractal seabed.
This paper investigates the image formation process of an object for low frequency SAS system. We will study the image forma- tion process of simple targets in free water. Adding a boundary to the problem (seabed) breaks the symmetry of the problem and the Helmoltz-Kirchhoff equation has to be approximated in order to be solved. Comparing the solution of the equation with real SAS images, it appears that the target boundaries and texture cannot be explained via this method. In this paper we introduce a co- herent perturbation of the Green derivative function present in the Helmoltz-Kirchhoff model to model the reflection by a fractal seabed.
| Original language | English |
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| Title of host publication | Proceedings of the 10th European Conference on Underwater Acoustics, ECUA 2010 |
| Subtitle of host publication | Istanbul, Turkey, July 5 - 9, 2010 |
| Pages | 1241-1250 |
| Number of pages | 9 |
| Volume | 3 |
| Publication status | Published - Jul 2010 |