Masking of time-frequency patterns in applications of passive underwater target detection

Authors:
Jüri Sildam
Affiliations:
Defense Research and Development Canada Atlantic, Dartmouth, NS, Canada
Venue:
EURASIP Journal on Advances in Signal Processing - Special issue on advances in signal processing for maritime applications
Year:
2010

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Abstract

Spectrogram analysis of acoustical sounds for underwater target classification is utilized when loud nonstationary interference sources overlap with a signal of interest in time but can be separated in time-frequency (TF) domain. We propose a signal masking method which in a TF plane combines local statistical and morphological features of the signal of interest. A dissimilarity measure D of adjacent TF cells is used for local estimation of entropy H&&, followed by estimation of ΔH&& = H&&tc&&- H&&fc&&entropy difference, where H&&fc&&is calculated along the time axis at a mean frequency fc&& and H&&tc&&is calculated along the frequency axis at a mean time tc&& of the TF window, respectively. Due to a limited number of points used in ΔH&& estimation, the number of possible ΔH&& values, which define a primary mask, is also limited. A secondary mask is defined using morphological operators applied to, for example, H&& and ΔH&&. We demonstrate how primary and secondary masks can be used for signal detection and discrimination, respectively. We also show that the proposed approach can be generalized within the framework of Genetic Programming.