Micro-steered multilooking in synthetic aperture sonar imaging
Conference: EUSAR 2016 - 11th European Conference on Synthetic Aperture Radar
06/06/2016 - 06/09/2016 at Hamburg, Germany
Proceedings: EUSAR 2016
Pages: 4Language: englishTyp: PDF
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Authors:
Austeng, Andreas; Jensen, Are Charles (Dept. of Informatics, University of Oslo, Norway)
Hansen, Roy Edgar (Dept. of Informatics, University of Oslo, Norway & Norwegian Defence Research Establishment (FFI), Kjeller, Norway)
Abstract:
The presence of speckle noise degrades synthetic aperture sonar (SAS) images. In this work we study despeckling based on incoherent averaging of several acquisitions of the same imaged area in combination with an adaptive micro-steering of the effective aperture and frequency response. The different acquisitions are formed by weighting the wavenumber spectrum of the image. The adaptive steering mitigate structural changes in the image like filling of shadow areas and smearing of point-like targets. The approach is demonstrated on real data from the HISAS interferometric SAS collected by a HUGIN autonomous underwater vehicle.