2019_programme: 2D AND 3D CENTERED AND OFFSET CIRCULAR SYNTHETIC APERTURE SONAR POINT SPREAD FUNCTION

• Session: 04. Towards Automatic Target Recognition. Detection, Classification and Modelling
  Organiser(s): Groen Johannes, Jans Wolfgang, Pailhas Yan, Myers Vincent
• Lecture: 2D AND 3D CENTERED AND OFFSET CIRCULAR SYNTHETIC APERTURE SONAR POINT SPREAD FUNCTION [invited]
  Paper ID: 810
  Author(s): Pailhas Yan
  Presenter: Pailhas Yan
  Presentation type: oral
  Abstract: It has become clear over the last decade that target multiview brings significant improvement in terms of recognition rate and false alarm reduction. New acquisition and re-acquisition patterns have since emerged for autonomous missions to bring additional views of targets of interest. One of them is circular SAS (Synthetic Aperture Sonar) acquisition also known as CSAS (Circular SAS)\nwhich has proven to be very efficient both in terms of acquisition time and image resolution. However the theory of CSAS has not been fully investigated. In this talk, we study the problem of the CSAS PSF (Point Spread Function) which is the fundamental brick of the coherent image formation. We will first derive the analytical formula for the 2D centred CSAS PSF before extending the formula to\nany point in the full field of view (offset point). We will then derive the PSF for any point for a 3D configuration. Although the PSF is not constant in the CSAS image, we will show that it is possible to derive a uniformisation scheme of the PSF for any point in the field of view. We will also demonstrate that the proposed uniformisation increases the SNR (Signal to Noise Ratio) of the resulting CSAS image.
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• Corresponding author: Dr Pailhas Yan
  Affiliation: CMRE
  Country: Italy
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