Abstract
This work was motivated by the need to understand the effect of phase and amplitude variations on the scatterer's surface as well as the reflecting boundaries of the hydroacoustical tank on the structure of the acoustical field in modeling. It is known that the null positions of the spectral characteristics of the backscattered signals from various objects in water can yield information about their shape, dimensions, orientation, and structure. Accuracy of such measurements is affected by the amplitude and phase variations on the scatterer surface and these variations depend on the minimum distance between the transmitter and scatterer positions. Calculations of these distances for acceptable dimensions of acoustical tanks were performed. Expressions were derived to correct the minimum allowable distance to prevent time coincidence of impulses from the scatterer and from the walls of the echoic acoustical tank.
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