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An exploratory analysis of non-Poisson temporal behaviour in snapping shrimp noise

Legg, M.W., Duncan, A.J., Zaknich, A. and Greening, M.V. (2005) An exploratory analysis of non-Poisson temporal behaviour in snapping shrimp noise. In: Annual Conference of the Australian Acoustical Society: Acoustics in a Changing Environment, Acoustics 2005, 9 - 11 November, Busselton, Western Australia

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Abstract

Snapping shrimp are a well known interference source for underwater sonar and communication systems, particularly in shallow and harbour waters. The noise produced by snapping shrimp is highly impulsive and the amplitude statistics are non-Gaussian. Impulsive noise is most often modelled in a way that implicitly assumes that the temporal statistics are Poisson. The Poisson assumption implies that a snap from any shrimp is completely independent of snaps from other shrimp. This paper reports on an exploratory analysis of non-Poisson temporal behaviour in snapping shrimp noise using real acoustic data from different geographic locations in Australian coastal waters. The analysis makes use of various statistical techniques applied to snaps detected in high-pass filtered data using a threshold technique. Attempts are made to eliminate multi-path effects, which can introduce correlations between snap arrivals, from other possible effects such as interactions between shrimp. The results are compared and contrasted between different geographic locations.

Publication Type: Conference Paper
Murdoch Affiliation: School of Engineering Science
URI: http://researchrepository.murdoch.edu.au/id/eprint/14403
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