Target Imaging with Low Frequency SAS

Yan Pailhas, Yvan Petillot, Christopher Capus, R. Hollett, Bernard Mulgrew

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.
Original languageEnglish
Title of host publicationProceedings of the 10th European Conference on Underwater Acoustics, ECUA 2010
Subtitle of host publicationIstanbul, Turkey, July 5 - 9, 2010
Pages1241-1250
Number of pages9
Volume3
Publication statusPublished - Jul 2010

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