Mechanically scanned imaging sonars (MSIS) are mainly used for detection of small objects or aiding in
underwater navigation in limited area. Obtained images are detailed and, especially for not experienced user,
they may give an impression of a photography. However, the acoustic method of acquisition of sonar data
must be taken into account, as understanding observed scene is essential to properly interpret the data. To aid
the process of image interpretation the reference data may be used. In this paper the application of
bathymetric data to MSIS sonar images is proposed.
To match high resolution of MSIS images the density of bathymetric data must exceed the requirements of
S-44 IHO norm. For this research a swath bathymetric system based on phase interferometry of acoustic
signal was used to obtain such data in shallow waters. The article covers the motivation of usage of such data
in comparison to other existing bathymetric systems.
The proposed method uses acquired data to create additional channel in sonar image emphasizing sea-bed
gradient in relation to sonar head position and distinguish invisible / shadowed areas. Proposed method is
based on directional derivative of a sea-bed. Method presented in this article is a part of bigger research on
enhancing interpretative potential of stationary sonar images [1].
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