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/content/asa/journal/jasa/138/6/10.1121/1.4938268
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http://dx.doi.org/10.1121/1.3609118
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/content/asa/journal/jasa/138/6/10.1121/1.4938268
2015-12-22
2016-10-01

Abstract

In many underwater acoustics problems such as search and rescue, it is desirable to establish the source of the sonar pings. In this paper a methodology is proposed to watermark sonar pulses prior to transmission by embedding them with a chain of low power chirplets represented by a graph. Watermark detection is formulated using stretch processing where chirplet energies are focused on a single beat frequency only if the graph is traversed along the same path used at the source. The algorithm is tested by simulation in shallow water at varying ranges.

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