Comparison of sonar images with well-known differences from raw data

The sonar is a technique used to observe the underwater scene over large distances. The active sonar is mainly used for imaging or for bathymetry. With the modern sonar both uses are now possible. To form a high resolution three-dimensional image, an active side-scan sonar is used. To develop algorithms in order to obtain an image, we need experimental data. A data acquisition campaign requires time, a ship, and is also expensive. One of the difficulties in the analysis of the sonar data is not to know the seabed and to repeat an experiment in exactly the same environment. The experimental side of studies can be complex. To overcome these problems, a sonar signal simulator can be used. In this paper we describe processing sequences including a sonar signal simulator, micro navigation and SAS algorithms. Many simulators use a perfect platform motion. Here, the platform path can be modified. Nevertheless, it is possible to have the accurate position of the platform for each sample, which is not possible with experimental data.