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Proceedings Paper

Moment feature variability in uncertain propagation channels
Author(s): Greg Okopal; Patrick J. Loughlin
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Paper Abstract

In underwater automatic target recognition via active sonar, the transmitted sonar pulse and the returning target backscatter can undergo significant distortion due to channel effects, such as frequency-dependent attenuation (damping) and dispersion, as well as random effects due to noise and other channel variability. These propagationinduced effects can be detrimental to classification because the observed backscatter depends not only on the target but also on the propagation environment and how far the wave has traveled, resulting in increased variability in the received sonar signals. Using a recently developed phase space approximation for dispersive propagation, we present a method for analyzing these effects on temporal and spectral moment features of the propagating signal, including uncertainty in certain channel parameters, in particular target distance.

Paper Details

Date Published: 3 September 2009
PDF: 11 pages
Proc. SPIE 7444, Mathematics for Signal and Information Processing, 74440U (3 September 2009); doi: 10.1117/12.834176
Show Author Affiliations
Greg Okopal, Univ. of Pittsburgh (United States)
Patrick J. Loughlin, Univ. of Pittsburgh (United States)


Published in SPIE Proceedings Vol. 7444:
Mathematics for Signal and Information Processing
Franklin T. Luk; Mark S. Schmalz; Gerhard X. Ritter; Junior Barrera; Jaakko T. Astola, Editor(s)

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