Time frequency signal analysis of ground vehicle acoustic signatures

Author

Lo, Kam W. ; Ferguson, Brian G.

Author_Institution

Maritime Operations Div., Defence Sci. & Technol. Organ., Pyrmont, NSW, Australia

fYear

2002

fDate

11-13 Feb. 2002

Firstpage

301

Lastpage

304

Abstract

The acoustic signatures of various types of ground vehicles are recorded during each vehicle´s transit past a stationary microphone located just above ground level and the acoustic data are analysed using the short time Fourier transform. The spectrogram for each transiting vehicle exhibits a primary set and a secondary set of harmonic lines in the time-frequency domain that can be used for classification purposes. The frequency of each harmonic line varies with time due to the acoustical Doppler effect. The variation with time of the instantaneous frequency of the strongest harmonic line is used to estimate the speed, ground distance at the closest point of approach to the microphone, and engine-firing rate of the vehicle.

Keywords

Doppler effect; acoustic signal processing; harmonics; least squares approximations; signal classification; spectral analysis; time-frequency analysis; acoustic data; acoustical Doppler effect; classification; engine-firing rate; ground vehicle acoustic signatures; harmonic lines; instantaneous frequency; short time Fourier transform; spectrogram; time frequency signal analysis; time-frequency domain; transiting vehicle; Data analysis; Doppler effect; Fourier transforms; Frequency estimation; Land vehicles; Microphones; Road vehicles; Signal analysis; Spectrogram; Time frequency analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Information, Decision and Control, 2002. Final Program and Abstracts

Conference_Location

Adelaide, SA, Australia

Print_ISBN

0-7803-7270-0

Type

conf

DOI

10.1109/IDC.2002.995415

Filename

995415