Passive Acoustic Method for Tracking Moving Sound Sources

Abstract

This paper presents an acoustic method to obtain the instantaneous velocity and position of am oving sound source following an unknown 3D path provided that the position of the source is known at arandom time instant. The method involves am esh of at least 7a coustic receivers distributed in the acoustic influence area of the source, and assumes that the background noise is uncorrelated between them. It is necessary to knowthe position of the source at arandom instant in order to compensate for the propagation time delay between the signals of the receivers. The method focuses on the relative Doppler Effect between ar eference microphone and the rest to obtain the velocity and position at every time instant. The performance of the method has been simulated and experimentally tested in the case of am oving sound source travelling in al inear path, and the location errors obtained in both cases are acceptable.

Aircraft localization using a passive acoustic method. Experimental test

“…If t is so small that, during the interval [t o ; t o + t], the distance traveled by the aircraft is much smaller than the distance between the aircraft and the receiver and also the aircraft velocity v can be considered a constant, then the relationship between the received and the emitted signal is [18] y n (t…”

“…In contrast, the method used in the present paper relies on both the time delay (retardation effect) and the time stretch (Doppler effect) [17,18] to obtain the source position and velocity. Seven microphones are distributed on the ground within the acoustic area of influence of the moving sound source.…”

Fast-Moving Sound Source Tracking With Relative Doppler Stretch

“…Thus, observation time intervals for different microphones should be different so that the signals from the same source position can be included in the observation, which brings trouble to the sound source tracking. To this end, M. Genescà et al [8] proposed a method that the signals from each microphone could be synchronized to compensate for the retardation effect. With this method, the relative Doppler stretches from seven microphones were directly calculated through the one-dimensional wideband cross-ambiguity function with equal observation time interval.…”

Second-Order Correction to the Classical Doppler and Eco-Doppler Formulas

“…Ultrasonic Doppler Ve locimetry (UDV)c an measure in real-time a complete spatio-temporal velocity profile in different flow conditions, even in opaque, non-Newtonian, highly viscous liquids [3,4]. Microphone arrays distributed overextended areas have been used for tracking moving sound sources, based on the Doppler effect in the signals received by the microphones [5,6]. Ultrasound Doppler medical equipment is routinely applied to produce accurate assessment of the velocity of blood and cardiac tissue [7,8].…”