Abstract
The accuracies and computational times of theoretical methods used to predict the scattering from rigid plane and curved reflectors have been evaluated. These methods were based on different solutions of the Helmholtz-Kirchhoff integral equation. The prediction results were compared to measurements. It was found that a boundary integral method provided accurate predictions for both panel types. For the more approximate prediction methods their limitations were defined in terms of the accuracy achieved and the range over which the methods were applicable. These methods were also used to investigate the use of a cut-off frequency to describe the limit above which specular type reflections dominate the scattering. It was found to be applicable only close to the geometric scattering angle.
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