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Proceedings Paper

Acoustic simulation in realistic 3D virtual scenes
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Paper Abstract

The simulation workshop CHORALE developed in collaboration with OKTAL SE company for the French MoD is used by government services and industrial companies for weapon system validation and qualification trials in the infrared domain. The main operational reference for CHORALE is the assessment of the infrared guidance system of the Storm Shadow missile French version, called Scalp. The use of CHORALE workshop is now extended to the acoustic domain. The main objective is the simulation of the detection of moving vehicles in realistic 3D virtual scenes. This article briefly describes the acoustic model in CHORALE. The 3D scene is described by a set of polygons. Each polygon is characterized by its acoustic resistivity or its complex impedance. Sound sources are associated with moving vehicles and are characterized by their spectra and directivities. A microphone sensor is defined by its position, its frequency band and its sensitivity. The purpose of the acoustic simulation is to calculate the incoming acoustic pressure on microphone sensors. CHORALE is based on a generic ray tracing kernel. This kernel possesses original capabilities: computation time is nearly independent on the scene complexity, especially the number of polygons, databases are enhanced with precise physical data, special mechanisms of antialiasing have been developed that enable to manage very accurate details. The ray tracer takes into account the wave geometrical divergence and the atmospheric transmission. The sound wave refraction is simulated and rays cast in the 3D scene are curved according to air temperature gradient. Finally, sound diffraction by edges (hill, wall,...) is also taken into account.

Paper Details

Date Published: 5 September 2003
PDF: 11 pages
Proc. SPIE 5075, Targets and Backgrounds IX: Characterization and Representation, (5 September 2003); doi: 10.1117/12.497124
Show Author Affiliations
Patrick Gozard, Delegation Generale pour l'Armement (France)
Alain Le Goff, Delegation Generale pour l'Armement (France)
Pierre Naz, ISL (France)
Thierry Cathala, OKTAL Synthetic Environment (France)
Jean Latger, OKTAL Synthetic Environment (France)


Published in SPIE Proceedings Vol. 5075:
Targets and Backgrounds IX: Characterization and Representation
Wendell R. Watkins; Dieter Clement; William R. Reynolds, Editor(s)

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