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| Le Chenadec, Gilles; Boucher, Jean-marc; Lurton, Xavier. |
| Backscattered signal statistics are widely used for target detection and seafloor characterization. The K-distribution shows interesting properties for describing experimental backscattered intensity statistics. In addition to the fact that its probability distribution function accurately fits actual sonar data, it advantageously provides a physical interpretation linked to the backscattering phenomenon. Sonar systems usually record backscattered signals from a wide angular range across the ship's track. In this context, previous studies have shown that backscatter statistics strongly depend on the incidence angle. In this paper, we propose an extension of previous works to model the angular evolution of the K-distribution shape parameter. This evolution... |
| Tipo: Text |
Palavras-chave: K distribution; Sonar statistical analysis; Seafloor classification. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2599.pdf |
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| Hellequin, Laurent; Boucher, Jean; Lurton, Xavier. |
| Processing simultaneous bathymetry and backscatter data, multibeam echosounders (MBESs) show promising abilities for remote seafloor characterization. High-frequency MBESs provide a good horizontal resolution, making it possible to distinguish fine details at. the water-seafloor interface. However, in order to accurately measure the seafloor influence on the backscattered energy,the recorded sonar data must first be processed and cleared of various artifacts. generated by the sonar system itself. Such a preprocessing correction procedure along with the assessment of its validity limits is presented here and applied to a 95-kHz MBES (Simrad EM1000) data set. Beam pattern effects, uneven array sensitivities, and inaccurate normalization of the ensonified... |
| Tipo: Text |
Palavras-chave: Seafloor classification; Multibeam echo sounder MBES; K distribution; Backscatter model. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/publication-708.pdf |
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