Time domain modeling for impulse source localization in urban environments
Invited paper
Institute Saint-Louis
Monday 1 june, 2015, 12:00 - 12:20
0.7 Lisbon (47)
Abstract:
The localization of acoustic sources with a network of distributed microphones is difficult in urban environments, due to the complex propagation effects such as reflexions and diffractions on buildings. The present study discusses our efforts toward localizing impulse sources using a Finite Difference Time Domain (FDTD) model. Our model is evaluated against theory and observations in presence of urban-type obstacles. The computational burden is made tractable on the basis of comprehensive physical considerations. Two approaches for localization are introduced. The first approach essentially relies on the time reversal of the microphones measurements with the FDTD model. In the second approach, the source is localized by matching the observed characteristics to a look-up table obtained from time-domain simulations for various source positions. The two approaches are tested and compared with impulse measurements in an urban area, and their respective sensitivities are discussed.