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COSIM is a coherent backscatter simulator for generic high frequency sonars developed by QinetiQ. This model simulates acoustic backscattering in the time domain from various types of seafloor and targets, in various environmental conditions. The parameters of the model include pulse length and type, sonar characteristics, environmental properties concerning water column and sea surface and physical seafloor properties. In this paper we present descriptions of the various simulation stages, from the seabed generation to the signal simulation. Our main focus in thi paper is the introduction of spatial and temporal fluctuations within the water column and on the seabed and their detrimental effect on synthetic aperture sonar processing. Prior work on seabed clutter (Dugelay and Brothers, Proceedings Oceans 2002) and statistical analysis (Dugelay, Brothers and Heald, 142nd ASA Proceedings) is introduced into the seabed simulation module and initial results on the effect of seabed clutter density are presente... |
