Abstract
Sonar performance measurements in the sea are always affected by uncontrollable and/or uncertain environmental conditions as sound speed variations, bottom topography or the acoustic properties of the sea floor. This paper presents a method to determine a sonar - target geometry which minimizes the uncertainty in target signal excess due to environmental variability. An acoustic model is used to estimate the signal excess for a large number of sound speed profiles measured in the relevant area. The results are compared seeking a target range and depth where the estimated signal excess is robust with respect to the variation of sound speed profiles to be expected in the actual area. Results from sea trials will be presented as well as simulated examples used to demonstrate the robustness or sensitivity of the signal excess to environmental changes at different test geometries.
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