Acoustic simulation in realistic 3D virtual scenes

Patrick Gozard; Alain Le Goff; Pierre Naz; Thierry Cathala; Jean Latger

doi:10.1117/12.497124

5 September 2003 Acoustic simulation in realistic 3D virtual scenes

Patrick Gozard, Alain Le Goff, Pierre Naz, Thierry Cathala, Jean Latger

Proceedings Volume 5075, Targets and Backgrounds IX: Characterization and Representation; (2003) https://doi.org/10.1117/12.497124
Event: AeroSense 2003, 2003, Orlando, Florida, United States

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.

Citation Download Citation

Patrick Gozard, Alain Le Goff, Pierre Naz, Thierry Cathala, and Jean Latger "Acoustic simulation in realistic 3D virtual scenes", Proc. SPIE 5075, Targets and Backgrounds IX: Characterization and Representation, (5 September 2003); https://doi.org/10.1117/12.497124

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available