DocumentCode :
2104203
Title :
Harmonic phase coupling for battlefield acoustic target identification
Author :
Lake, Douglas E.
Author_Institution :
Army Res. Lab., Adelphi, MD, USA
Volume :
4
fYear :
1998
fDate :
12-15 May 1998
Firstpage :
2049
Abstract :
Target identification using battlefield acoustic sensor arrays is an important problem for the Army. Acoustic signatures of targets of interest, such as tanks and trucks, exhibit time-varying patterns of harmonic amplitudes that facilitate target ID. In this paper, harmonic phase coupling is shown to also be present in these acoustic signatures though issues remain to fully exploit these relationships for target ID. With all else being equal, frequencies with simple harmonic relationships, such as 2 to 1 or 3 to 2, are preferred to produce stable features. Also, naive use of FFT approaches to estimate phase leads to erratic estimates. Cramer-Rao bounds (CRB) are presented and provide insights into the limitations of the accuracy of phase coupling estimates and suggests the value of developing nonstationary methods
Keywords :
acoustic arrays; acoustic signal processing; array signal processing; harmonic analysis; identification; maximum likelihood estimation; military systems; object recognition; Army; Cramer-Rao bounds; FFT approaches; acoustic signatures; battlefield acoustic sensor arrays; battlefield acoustic target identification; harmonic amplitudes; harmonic phase coupling; nonstationary methods; stable features; tanks; target ID; time-varying patterns; trucks; Acoustic noise; Acoustic sensors; Additive noise; Frequency; Gaussian noise; Laboratories; Lakes; Maximum likelihood estimation; Phase estimation; White noise;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Seattle, WA
ISSN :
1520-6149
Print_ISBN :
0-7803-4428-6
Type :
conf
DOI :
10.1109/ICASSP.1998.681546
Filename :
681546
Link To Document :
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