Ground Reflection with Turbulence Induced Coherence Loss in Flyover Auralization

Abstract

A method to include the effect of coherence loss due to turbulence is proposed for real-time auralization of aircraft noise. By modifying the direct ray contribution relative to the ground reflected ray, using filters, the coherence loss effect can be included in a propagation scheme. The results of this approach match with the theoretical predictions thereby verifying the ability of the method. Furthermore, the modulation of aircraft tonal components, due to changing ground interference during a flyover, is diminished as a result of the proposed method. Application to an auralization and comparing to a measurement shows that auralizations can benefit from this method. Therefore the current method forms an essential addition to the techniques currently used in the auralization of aircraft noise.