A moving sound source localization method based on TDOA

The Time Difference of Arrival (TDOA) method has been widely used for sound source localization. However, because of the Doppler-effect, the TDOA method cannot be directly used for locating moving sound sources. This paper develops a moving sound source localization method based on TDOA, combining with Doppler-effect elimination and source plane scanning. This method is suitable for locating sound sources moving in a plane, with a measurable velocity. In this method, the sound source plane is meshed into grids. Choose one grid point as the assumed sound source location, eliminate the Doppler-effect from the measured sound pressure signals, and then locate the sound source using TDOA method. The deviation between the localization result and the chosen grid point is recorded. Do this progress by scanning all the grids on the plane. The grid point which minimizes the deviation through the plane is taken as the sound source location estimation. Simulations show that this method can accurately locate high speed sound sources even with background noise, using short sections of signals received by a four-microphone array.